mirror of
https://github.com/0intro/conterm
synced 2024-11-22 05:41:28 +03:00
2292 lines
53 KiB
C
2292 lines
53 KiB
C
#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include <auth.h>
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#include <mp.h>
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#include <libsec.h>
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// The main groups of functions are:
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// client/server - main handshake protocol definition
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// message functions - formating handshake messages
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// cipher choices - catalog of digest and encrypt algorithms
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// security functions - PKCS#1, sslHMAC, session keygen
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// general utility functions - malloc, serialization
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// The handshake protocol builds on the TLS/SSL3 record layer protocol,
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// which is implemented in kernel device #a. See also /lib/rfc/rfc2246.
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enum {
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TLSFinishedLen = 12,
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SSL3FinishedLen = MD5dlen+SHA1dlen,
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MaxKeyData = 104, // amount of secret we may need
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MaxChunk = 1<<14,
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RandomSize = 32,
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SidSize = 32,
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MasterSecretSize = 48,
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AQueue = 0,
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AFlush = 1,
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};
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typedef struct TlsSec TlsSec;
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typedef struct Bytes{
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int len;
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uchar data[1]; // [len]
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} Bytes;
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typedef struct Ints{
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int len;
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int data[1]; // [len]
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} Ints;
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typedef struct Algs{
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char *enc;
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char *digest;
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int nsecret;
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int tlsid;
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int ok;
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} Algs;
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typedef struct Finished{
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uchar verify[SSL3FinishedLen];
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int n;
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} Finished;
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typedef struct TlsConnection{
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TlsSec *sec; // security management goo
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int hand, ctl; // record layer file descriptors
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int erred; // set when tlsError called
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int (*trace)(char*fmt, ...); // for debugging
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int version; // protocol we are speaking
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int verset; // version has been set
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int ver2hi; // server got a version 2 hello
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int isClient; // is this the client or server?
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Bytes *sid; // SessionID
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Bytes *cert; // only last - no chain
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Lock statelk;
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int state; // must be set using setstate
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// input buffer for handshake messages
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uchar buf[MaxChunk+2048];
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uchar *rp, *ep;
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uchar crandom[RandomSize]; // client random
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uchar srandom[RandomSize]; // server random
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int clientVersion; // version in ClientHello
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char *digest; // name of digest algorithm to use
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char *enc; // name of encryption algorithm to use
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int nsecret; // amount of secret data to init keys
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// for finished messages
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MD5state hsmd5; // handshake hash
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SHAstate hssha1; // handshake hash
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Finished finished;
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} TlsConnection;
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typedef struct Msg{
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int tag;
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union {
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struct {
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int version;
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uchar random[RandomSize];
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Bytes* sid;
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Ints* ciphers;
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Bytes* compressors;
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} clientHello;
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struct {
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int version;
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uchar random[RandomSize];
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Bytes* sid;
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int cipher;
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int compressor;
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} serverHello;
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struct {
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int ncert;
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Bytes **certs;
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} certificate;
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struct {
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Bytes *types;
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int nca;
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Bytes **cas;
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} certificateRequest;
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struct {
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Bytes *key;
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} clientKeyExchange;
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Finished finished;
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} u;
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} Msg;
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typedef struct TlsSec{
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char *server; // name of remote; nil for server
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int ok; // <0 killed; ==0 in progress; >0 reusable
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RSApub *rsapub;
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AuthRpc *rpc; // factotum for rsa private key
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uchar sec[MasterSecretSize]; // master secret
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uchar crandom[RandomSize]; // client random
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uchar srandom[RandomSize]; // server random
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int clientVers; // version in ClientHello
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int vers; // final version
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// byte generation and handshake checksum
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void (*prf)(uchar*, int, uchar*, int, char*, uchar*, int, uchar*, int);
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void (*setFinished)(TlsSec*, MD5state, SHAstate, uchar*, int);
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int nfin;
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} TlsSec;
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enum {
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TLSVersion = 0x0301,
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SSL3Version = 0x0300,
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ProtocolVersion = 0x0301, // maximum version we speak
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MinProtoVersion = 0x0300, // limits on version we accept
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MaxProtoVersion = 0x03ff,
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};
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// handshake type
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enum {
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HHelloRequest,
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HClientHello,
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HServerHello,
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HSSL2ClientHello = 9, /* local convention; see devtls.c */
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HCertificate = 11,
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HServerKeyExchange,
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HCertificateRequest,
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HServerHelloDone,
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HCertificateVerify,
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HClientKeyExchange,
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HFinished = 20,
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HMax
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};
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// alerts
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enum {
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ECloseNotify = 0,
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EUnexpectedMessage = 10,
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EBadRecordMac = 20,
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EDecryptionFailed = 21,
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ERecordOverflow = 22,
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EDecompressionFailure = 30,
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EHandshakeFailure = 40,
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ENoCertificate = 41,
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EBadCertificate = 42,
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EUnsupportedCertificate = 43,
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ECertificateRevoked = 44,
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ECertificateExpired = 45,
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ECertificateUnknown = 46,
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EIllegalParameter = 47,
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EUnknownCa = 48,
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EAccessDenied = 49,
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EDecodeError = 50,
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EDecryptError = 51,
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EExportRestriction = 60,
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EProtocolVersion = 70,
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EInsufficientSecurity = 71,
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EInternalError = 80,
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EUserCanceled = 90,
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ENoRenegotiation = 100,
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EMax = 256
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};
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// cipher suites
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enum {
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TLS_NULL_WITH_NULL_NULL = 0x0000,
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TLS_RSA_WITH_NULL_MD5 = 0x0001,
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TLS_RSA_WITH_NULL_SHA = 0x0002,
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TLS_RSA_EXPORT_WITH_RC4_40_MD5 = 0x0003,
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TLS_RSA_WITH_RC4_128_MD5 = 0x0004,
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TLS_RSA_WITH_RC4_128_SHA = 0x0005,
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TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5 = 0X0006,
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TLS_RSA_WITH_IDEA_CBC_SHA = 0X0007,
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TLS_RSA_EXPORT_WITH_DES40_CBC_SHA = 0X0008,
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TLS_RSA_WITH_DES_CBC_SHA = 0X0009,
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TLS_RSA_WITH_3DES_EDE_CBC_SHA = 0X000A,
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TLS_DH_DSS_EXPORT_WITH_DES40_CBC_SHA = 0X000B,
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TLS_DH_DSS_WITH_DES_CBC_SHA = 0X000C,
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TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA = 0X000D,
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TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA = 0X000E,
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TLS_DH_RSA_WITH_DES_CBC_SHA = 0X000F,
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TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA = 0X0010,
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TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA = 0X0011,
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TLS_DHE_DSS_WITH_DES_CBC_SHA = 0X0012,
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TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA = 0X0013, // ZZZ must be implemented for tls1.0 compliance
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TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA = 0X0014,
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TLS_DHE_RSA_WITH_DES_CBC_SHA = 0X0015,
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TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA = 0X0016,
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TLS_DH_anon_EXPORT_WITH_RC4_40_MD5 = 0x0017,
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TLS_DH_anon_WITH_RC4_128_MD5 = 0x0018,
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TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA = 0X0019,
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TLS_DH_anon_WITH_DES_CBC_SHA = 0X001A,
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TLS_DH_anon_WITH_3DES_EDE_CBC_SHA = 0X001B,
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TLS_RSA_WITH_AES_128_CBC_SHA = 0X002f, // aes, aka rijndael with 128 bit blocks
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TLS_DH_DSS_WITH_AES_128_CBC_SHA = 0X0030,
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TLS_DH_RSA_WITH_AES_128_CBC_SHA = 0X0031,
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TLS_DHE_DSS_WITH_AES_128_CBC_SHA = 0X0032,
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TLS_DHE_RSA_WITH_AES_128_CBC_SHA = 0X0033,
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TLS_DH_anon_WITH_AES_128_CBC_SHA = 0X0034,
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TLS_RSA_WITH_AES_256_CBC_SHA = 0X0035,
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TLS_DH_DSS_WITH_AES_256_CBC_SHA = 0X0036,
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TLS_DH_RSA_WITH_AES_256_CBC_SHA = 0X0037,
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TLS_DHE_DSS_WITH_AES_256_CBC_SHA = 0X0038,
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TLS_DHE_RSA_WITH_AES_256_CBC_SHA = 0X0039,
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TLS_DH_anon_WITH_AES_256_CBC_SHA = 0X003A,
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CipherMax
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};
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// compression methods
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enum {
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CompressionNull = 0,
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CompressionMax
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};
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static Algs cipherAlgs[] = {
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{"rc4_128", "md5", 2 * (16 + MD5dlen), TLS_RSA_WITH_RC4_128_MD5},
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{"rc4_128", "sha1", 2 * (16 + SHA1dlen), TLS_RSA_WITH_RC4_128_SHA},
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{"3des_ede_cbc","sha1",2*(4*8+SHA1dlen), TLS_RSA_WITH_3DES_EDE_CBC_SHA},
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};
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static uchar compressors[] = {
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CompressionNull,
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};
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static TlsConnection *tlsServer2(int ctl, int hand, uchar *cert, int ncert, int (*trace)(char*fmt, ...));
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static TlsConnection *tlsClient2(int ctl, int hand, uchar *csid, int ncsid, int (*trace)(char*fmt, ...));
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static void msgClear(Msg *m);
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static char* msgPrint(char *buf, int n, Msg *m);
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static int msgRecv(TlsConnection *c, Msg *m);
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static int msgSend(TlsConnection *c, Msg *m, int act);
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static void tlsError(TlsConnection *c, int err, char *msg, ...);
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#pragma varargck argpos tlsError 3
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static int setVersion(TlsConnection *c, int version);
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static int finishedMatch(TlsConnection *c, Finished *f);
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static void tlsConnectionFree(TlsConnection *c);
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static int setAlgs(TlsConnection *c, int a);
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static int okCipher(Ints *cv);
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static int okCompression(Bytes *cv);
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static int initCiphers(void);
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static Ints* makeciphers(void);
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static TlsSec* tlsSecInits(int cvers, uchar *csid, int ncsid, uchar *crandom, uchar *ssid, int *nssid, uchar *srandom);
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static int tlsSecSecrets(TlsSec *sec, int vers, uchar *epm, int nepm, uchar *kd, int nkd);
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static TlsSec* tlsSecInitc(int cvers, uchar *crandom);
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static int tlsSecSecretc(TlsSec *sec, uchar *sid, int nsid, uchar *srandom, uchar *cert, int ncert, int vers, uchar **epm, int *nepm, uchar *kd, int nkd);
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static int tlsSecFinished(TlsSec *sec, MD5state md5, SHAstate sha1, uchar *fin, int nfin, int isclient);
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static void tlsSecOk(TlsSec *sec);
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static void tlsSecKill(TlsSec *sec);
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static void tlsSecClose(TlsSec *sec);
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static void setMasterSecret(TlsSec *sec, Bytes *pm);
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static void serverMasterSecret(TlsSec *sec, uchar *epm, int nepm);
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static void setSecrets(TlsSec *sec, uchar *kd, int nkd);
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static int clientMasterSecret(TlsSec *sec, RSApub *pub, uchar **epm, int *nepm);
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static Bytes *pkcs1_encrypt(Bytes* data, RSApub* key, int blocktype);
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static Bytes *pkcs1_decrypt(TlsSec *sec, uchar *epm, int nepm);
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static void tlsSetFinished(TlsSec *sec, MD5state hsmd5, SHAstate hssha1, uchar *finished, int isClient);
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static void sslSetFinished(TlsSec *sec, MD5state hsmd5, SHAstate hssha1, uchar *finished, int isClient);
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static void sslPRF(uchar *buf, int nbuf, uchar *key, int nkey, char *label,
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uchar *seed0, int nseed0, uchar *seed1, int nseed1);
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static int setVers(TlsSec *sec, int version);
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static AuthRpc* factotum_rsa_open(uchar *cert, int certlen);
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static mpint* factotum_rsa_decrypt(AuthRpc *rpc, mpint *cipher);
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static void factotum_rsa_close(AuthRpc*rpc);
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static void* emalloc(int);
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static void* erealloc(void*, int);
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static void put32(uchar *p, u32int);
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static void put24(uchar *p, int);
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static void put16(uchar *p, int);
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static u32int get32(uchar *p);
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static int get24(uchar *p);
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static int get16(uchar *p);
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static Bytes* newbytes(int len);
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static Bytes* makebytes(uchar* buf, int len);
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static void freebytes(Bytes* b);
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static Ints* newints(int len);
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static Ints* makeints(int* buf, int len);
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static void freeints(Ints* b);
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//================= client/server ========================
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// push TLS onto fd, returning new (application) file descriptor
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// or -1 if error.
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int
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tlsServer(int fd, TLSconn *conn)
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{
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char buf[8];
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char dname[64];
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int n, data, ctl, hand;
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TlsConnection *tls;
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if(conn == nil)
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return -1;
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ctl = open("#a/tls/clone", ORDWR);
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if(ctl < 0)
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return -1;
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n = read(ctl, buf, sizeof(buf)-1);
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if(n < 0){
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close(ctl);
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return -1;
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}
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buf[n] = 0;
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sprint(conn->dir, "#a/tls/%s", buf);
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sprint(dname, "#a/tls/%s/hand", buf);
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hand = open(dname, ORDWR);
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if(hand < 0){
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close(ctl);
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return -1;
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}
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fprint(ctl, "fd %d 0x%x", fd, ProtocolVersion);
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tls = tlsServer2(ctl, hand, conn->cert, conn->certlen, conn->trace);
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sprint(dname, "#a/tls/%s/data", buf);
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data = open(dname, ORDWR);
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close(fd);
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close(hand);
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close(ctl);
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if(data < 0){
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return -1;
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}
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if(tls == nil){
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close(data);
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return -1;
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}
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if(conn->cert)
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free(conn->cert);
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conn->cert = 0; // client certificates are not yet implemented
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conn->certlen = 0;
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conn->sessionIDlen = tls->sid->len;
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conn->sessionID = emalloc(conn->sessionIDlen);
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memcpy(conn->sessionID, tls->sid->data, conn->sessionIDlen);
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tlsConnectionFree(tls);
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return data;
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}
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// push TLS onto fd, returning new (application) file descriptor
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// or -1 if error.
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int
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tlsClient(int fd, TLSconn *conn)
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{
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char buf[8];
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char dname[64];
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int n, data, ctl, hand;
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TlsConnection *tls;
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if(!conn)
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return -1;
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ctl = open("#a/tls/clone", ORDWR);
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if(ctl < 0)
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return -1;
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n = read(ctl, buf, sizeof(buf)-1);
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if(n < 0){
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close(ctl);
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return -1;
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}
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buf[n] = 0;
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sprint(conn->dir, "#a/tls/%s", buf);
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sprint(dname, "#a/tls/%s/hand", buf);
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hand = open(dname, ORDWR);
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if(hand < 0){
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close(ctl);
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return -1;
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}
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sprint(dname, "#a/tls/%s/data", buf);
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data = open(dname, ORDWR);
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if(data < 0)
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return -1;
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fprint(ctl, "fd %d 0x%x", fd, ProtocolVersion);
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tls = tlsClient2(ctl, hand, conn->sessionID, conn->sessionIDlen, conn->trace);
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close(fd);
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close(hand);
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close(ctl);
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if(tls == nil){
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close(data);
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return -1;
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}
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conn->certlen = tls->cert->len;
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conn->cert = emalloc(conn->certlen);
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memcpy(conn->cert, tls->cert->data, conn->certlen);
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conn->sessionIDlen = tls->sid->len;
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conn->sessionID = emalloc(conn->sessionIDlen);
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memcpy(conn->sessionID, tls->sid->data, conn->sessionIDlen);
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tlsConnectionFree(tls);
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return data;
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}
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static TlsConnection *
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tlsServer2(int ctl, int hand, uchar *cert, int ncert, int (*trace)(char*fmt, ...))
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{
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TlsConnection *c;
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Msg m;
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Bytes *csid;
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uchar sid[SidSize], kd[MaxKeyData];
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char *secrets;
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int cipher, compressor, nsid, rv;
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if(trace)
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trace("tlsServer2\n");
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if(!initCiphers())
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return nil;
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c = emalloc(sizeof(TlsConnection));
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c->ctl = ctl;
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c->hand = hand;
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c->trace = trace;
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c->version = ProtocolVersion;
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memset(&m, 0, sizeof(m));
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if(!msgRecv(c, &m)){
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if(trace)
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trace("initial msgRecv failed\n");
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goto Err;
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}
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if(m.tag != HClientHello) {
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tlsError(c, EUnexpectedMessage, "expected a client hello");
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goto Err;
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}
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c->clientVersion = m.u.clientHello.version;
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if(trace)
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trace("ClientHello version %x\n", c->clientVersion);
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if(setVersion(c, m.u.clientHello.version) < 0) {
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tlsError(c, EIllegalParameter, "incompatible version");
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goto Err;
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}
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memmove(c->crandom, m.u.clientHello.random, RandomSize);
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cipher = okCipher(m.u.clientHello.ciphers);
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if(cipher < 0) {
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// reply with EInsufficientSecurity if we know that's the case
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if(cipher == -2)
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tlsError(c, EInsufficientSecurity, "cipher suites too weak");
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else
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tlsError(c, EHandshakeFailure, "no matching cipher suite");
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goto Err;
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}
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if(!setAlgs(c, cipher)){
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tlsError(c, EHandshakeFailure, "no matching cipher suite");
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goto Err;
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}
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compressor = okCompression(m.u.clientHello.compressors);
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if(compressor < 0) {
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tlsError(c, EHandshakeFailure, "no matching compressor");
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goto Err;
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}
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csid = m.u.clientHello.sid;
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|
if(trace)
|
|
trace(" cipher %d, compressor %d, csidlen %d\n", cipher, compressor, csid->len);
|
|
c->sec = tlsSecInits(c->clientVersion, csid->data, csid->len, c->crandom, sid, &nsid, c->srandom);
|
|
if(c->sec == nil){
|
|
tlsError(c, EHandshakeFailure, "can't initialize security: %r");
|
|
goto Err;
|
|
}
|
|
c->sec->rpc = factotum_rsa_open(cert, ncert);
|
|
if(c->sec->rpc == nil){
|
|
tlsError(c, EHandshakeFailure, "factotum_rsa_open: %r");
|
|
goto Err;
|
|
}
|
|
c->sec->rsapub = X509toRSApub(cert, ncert, nil, 0);
|
|
msgClear(&m);
|
|
|
|
m.tag = HServerHello;
|
|
m.u.serverHello.version = c->version;
|
|
memmove(m.u.serverHello.random, c->srandom, RandomSize);
|
|
m.u.serverHello.cipher = cipher;
|
|
m.u.serverHello.compressor = compressor;
|
|
c->sid = makebytes(sid, nsid);
|
|
m.u.serverHello.sid = makebytes(c->sid->data, c->sid->len);
|
|
if(!msgSend(c, &m, AQueue))
|
|
goto Err;
|
|
msgClear(&m);
|
|
|
|
m.tag = HCertificate;
|
|
m.u.certificate.ncert = 1;
|
|
m.u.certificate.certs = emalloc(m.u.certificate.ncert * sizeof(Bytes));
|
|
m.u.certificate.certs[0] = makebytes(cert, ncert);
|
|
if(!msgSend(c, &m, AQueue))
|
|
goto Err;
|
|
msgClear(&m);
|
|
|
|
m.tag = HServerHelloDone;
|
|
if(!msgSend(c, &m, AFlush))
|
|
goto Err;
|
|
msgClear(&m);
|
|
|
|
if(!msgRecv(c, &m))
|
|
goto Err;
|
|
if(m.tag != HClientKeyExchange) {
|
|
tlsError(c, EUnexpectedMessage, "expected a client key exchange");
|
|
goto Err;
|
|
}
|
|
if(tlsSecSecrets(c->sec, c->version, m.u.clientKeyExchange.key->data, m.u.clientKeyExchange.key->len, kd, c->nsecret) < 0){
|
|
tlsError(c, EHandshakeFailure, "couldn't set secrets: %r");
|
|
goto Err;
|
|
}
|
|
if(trace)
|
|
trace("tls secrets\n");
|
|
secrets = (char*)emalloc(2*c->nsecret);
|
|
enc64(secrets, 2*c->nsecret, kd, c->nsecret);
|
|
rv = fprint(c->ctl, "secret %s %s 0 %s", c->digest, c->enc, secrets);
|
|
memset(secrets, 0, 2*c->nsecret);
|
|
free(secrets);
|
|
memset(kd, 0, c->nsecret);
|
|
if(rv < 0){
|
|
tlsError(c, EHandshakeFailure, "can't set keys: %r");
|
|
goto Err;
|
|
}
|
|
msgClear(&m);
|
|
|
|
/* no CertificateVerify; skip to Finished */
|
|
if(tlsSecFinished(c->sec, c->hsmd5, c->hssha1, c->finished.verify, c->finished.n, 1) < 0){
|
|
tlsError(c, EInternalError, "can't set finished: %r");
|
|
goto Err;
|
|
}
|
|
if(!msgRecv(c, &m))
|
|
goto Err;
|
|
if(m.tag != HFinished) {
|
|
tlsError(c, EUnexpectedMessage, "expected a finished");
|
|
goto Err;
|
|
}
|
|
if(!finishedMatch(c, &m.u.finished)) {
|
|
tlsError(c, EHandshakeFailure, "finished verification failed");
|
|
goto Err;
|
|
}
|
|
msgClear(&m);
|
|
|
|
/* change cipher spec */
|
|
if(fprint(c->ctl, "changecipher") < 0){
|
|
tlsError(c, EInternalError, "can't enable cipher: %r");
|
|
goto Err;
|
|
}
|
|
|
|
if(tlsSecFinished(c->sec, c->hsmd5, c->hssha1, c->finished.verify, c->finished.n, 0) < 0){
|
|
tlsError(c, EInternalError, "can't set finished: %r");
|
|
goto Err;
|
|
}
|
|
m.tag = HFinished;
|
|
m.u.finished = c->finished;
|
|
if(!msgSend(c, &m, AFlush))
|
|
goto Err;
|
|
msgClear(&m);
|
|
if(trace)
|
|
trace("tls finished\n");
|
|
|
|
if(fprint(c->ctl, "opened") < 0)
|
|
goto Err;
|
|
tlsSecOk(c->sec);
|
|
return c;
|
|
|
|
Err:
|
|
msgClear(&m);
|
|
tlsConnectionFree(c);
|
|
return 0;
|
|
}
|
|
|
|
static TlsConnection *
|
|
tlsClient2(int ctl, int hand, uchar *csid, int ncsid, int (*trace)(char*fmt, ...))
|
|
{
|
|
TlsConnection *c;
|
|
Msg m;
|
|
uchar kd[MaxKeyData], *epm;
|
|
char *secrets;
|
|
int creq, nepm, rv;
|
|
|
|
if(!initCiphers())
|
|
return nil;
|
|
epm = nil;
|
|
c = emalloc(sizeof(TlsConnection));
|
|
c->version = ProtocolVersion;
|
|
c->ctl = ctl;
|
|
c->hand = hand;
|
|
c->trace = trace;
|
|
c->isClient = 1;
|
|
c->clientVersion = c->version;
|
|
|
|
c->sec = tlsSecInitc(c->clientVersion, c->crandom);
|
|
if(c->sec == nil)
|
|
goto Err;
|
|
|
|
/* client hello */
|
|
memset(&m, 0, sizeof(m));
|
|
m.tag = HClientHello;
|
|
m.u.clientHello.version = c->clientVersion;
|
|
memmove(m.u.clientHello.random, c->crandom, RandomSize);
|
|
m.u.clientHello.sid = makebytes(csid, ncsid);
|
|
m.u.clientHello.ciphers = makeciphers();
|
|
m.u.clientHello.compressors = makebytes(compressors,sizeof(compressors));
|
|
if(!msgSend(c, &m, AFlush))
|
|
goto Err;
|
|
msgClear(&m);
|
|
|
|
/* server hello */
|
|
if(!msgRecv(c, &m))
|
|
goto Err;
|
|
if(m.tag != HServerHello) {
|
|
tlsError(c, EUnexpectedMessage, "expected a server hello");
|
|
goto Err;
|
|
}
|
|
if(setVersion(c, m.u.serverHello.version) < 0) {
|
|
tlsError(c, EIllegalParameter, "incompatible version %r");
|
|
goto Err;
|
|
}
|
|
memmove(c->srandom, m.u.serverHello.random, RandomSize);
|
|
c->sid = makebytes(m.u.serverHello.sid->data, m.u.serverHello.sid->len);
|
|
if(c->sid->len != 0 && c->sid->len != SidSize) {
|
|
tlsError(c, EIllegalParameter, "invalid server session identifier");
|
|
goto Err;
|
|
}
|
|
if(!setAlgs(c, m.u.serverHello.cipher)) {
|
|
tlsError(c, EIllegalParameter, "invalid cipher suite");
|
|
goto Err;
|
|
}
|
|
if(m.u.serverHello.compressor != CompressionNull) {
|
|
tlsError(c, EIllegalParameter, "invalid compression");
|
|
goto Err;
|
|
}
|
|
msgClear(&m);
|
|
|
|
/* certificate */
|
|
if(!msgRecv(c, &m) || m.tag != HCertificate) {
|
|
tlsError(c, EUnexpectedMessage, "expected a certificate");
|
|
goto Err;
|
|
}
|
|
if(m.u.certificate.ncert < 1) {
|
|
tlsError(c, EIllegalParameter, "runt certificate");
|
|
goto Err;
|
|
}
|
|
c->cert = makebytes(m.u.certificate.certs[0]->data, m.u.certificate.certs[0]->len);
|
|
msgClear(&m);
|
|
|
|
/* server key exchange (optional) */
|
|
if(!msgRecv(c, &m))
|
|
goto Err;
|
|
if(m.tag == HServerKeyExchange) {
|
|
tlsError(c, EUnexpectedMessage, "got an server key exchange");
|
|
goto Err;
|
|
// If implementing this later, watch out for rollback attack
|
|
// described in Wagner Schneier 1996, section 4.4.
|
|
}
|
|
|
|
/* certificate request (optional) */
|
|
creq = 0;
|
|
if(m.tag == HCertificateRequest) {
|
|
creq = 1;
|
|
msgClear(&m);
|
|
if(!msgRecv(c, &m))
|
|
goto Err;
|
|
}
|
|
|
|
if(m.tag != HServerHelloDone) {
|
|
tlsError(c, EUnexpectedMessage, "expected a server hello done");
|
|
goto Err;
|
|
}
|
|
msgClear(&m);
|
|
|
|
if(tlsSecSecretc(c->sec, c->sid->data, c->sid->len, c->srandom,
|
|
c->cert->data, c->cert->len, c->version, &epm, &nepm,
|
|
kd, c->nsecret) < 0){
|
|
tlsError(c, EBadCertificate, "invalid x509/rsa certificate");
|
|
goto Err;
|
|
}
|
|
secrets = (char*)emalloc(2*c->nsecret);
|
|
enc64(secrets, 2*c->nsecret, kd, c->nsecret);
|
|
rv = fprint(c->ctl, "secret %s %s 1 %s", c->digest, c->enc, secrets);
|
|
memset(secrets, 0, 2*c->nsecret);
|
|
free(secrets);
|
|
memset(kd, 0, c->nsecret);
|
|
if(rv < 0){
|
|
tlsError(c, EHandshakeFailure, "can't set keys: %r");
|
|
goto Err;
|
|
}
|
|
|
|
if(creq) {
|
|
/* send a zero length certificate */
|
|
m.tag = HCertificate;
|
|
if(!msgSend(c, &m, AFlush))
|
|
goto Err;
|
|
msgClear(&m);
|
|
}
|
|
|
|
/* client key exchange */
|
|
m.tag = HClientKeyExchange;
|
|
m.u.clientKeyExchange.key = makebytes(epm, nepm);
|
|
free(epm);
|
|
epm = nil;
|
|
if(m.u.clientKeyExchange.key == nil) {
|
|
tlsError(c, EHandshakeFailure, "can't set secret: %r");
|
|
goto Err;
|
|
}
|
|
if(!msgSend(c, &m, AFlush))
|
|
goto Err;
|
|
msgClear(&m);
|
|
|
|
/* change cipher spec */
|
|
if(fprint(c->ctl, "changecipher") < 0){
|
|
tlsError(c, EInternalError, "can't enable cipher: %r");
|
|
goto Err;
|
|
}
|
|
|
|
// Cipherchange must occur immediately before Finished to avoid
|
|
// potential hole; see section 4.3 of Wagner Schneier 1996.
|
|
if(tlsSecFinished(c->sec, c->hsmd5, c->hssha1, c->finished.verify, c->finished.n, 1) < 0){
|
|
tlsError(c, EInternalError, "can't set finished 1: %r");
|
|
goto Err;
|
|
}
|
|
m.tag = HFinished;
|
|
m.u.finished = c->finished;
|
|
|
|
if(!msgSend(c, &m, AFlush)) {
|
|
fprint(2, "tlsClient nepm=%d\n", nepm);
|
|
tlsError(c, EInternalError, "can't flush after client Finished: %r");
|
|
goto Err;
|
|
}
|
|
msgClear(&m);
|
|
|
|
if(tlsSecFinished(c->sec, c->hsmd5, c->hssha1, c->finished.verify, c->finished.n, 0) < 0){
|
|
fprint(2, "tlsClient nepm=%d\n", nepm);
|
|
tlsError(c, EInternalError, "can't set finished 0: %r");
|
|
goto Err;
|
|
}
|
|
if(!msgRecv(c, &m)) {
|
|
fprint(2, "tlsClient nepm=%d\n", nepm);
|
|
tlsError(c, EInternalError, "can't read server Finished: %r");
|
|
goto Err;
|
|
}
|
|
if(m.tag != HFinished) {
|
|
fprint(2, "tlsClient nepm=%d\n", nepm);
|
|
tlsError(c, EUnexpectedMessage, "expected a Finished msg from server");
|
|
goto Err;
|
|
}
|
|
|
|
if(!finishedMatch(c, &m.u.finished)) {
|
|
tlsError(c, EHandshakeFailure, "finished verification failed");
|
|
goto Err;
|
|
}
|
|
msgClear(&m);
|
|
|
|
if(fprint(c->ctl, "opened") < 0){
|
|
if(trace)
|
|
trace("unable to do final open: %r\n");
|
|
goto Err;
|
|
}
|
|
tlsSecOk(c->sec);
|
|
return c;
|
|
|
|
Err:
|
|
free(epm);
|
|
msgClear(&m);
|
|
tlsConnectionFree(c);
|
|
return 0;
|
|
}
|
|
|
|
|
|
//================= message functions ========================
|
|
|
|
static uchar sendbuf[9000], *sendp;
|
|
|
|
static int
|
|
msgSend(TlsConnection *c, Msg *m, int act)
|
|
{
|
|
uchar *p; // sendp = start of new message; p = write pointer
|
|
int nn, n, i;
|
|
|
|
if(sendp == nil)
|
|
sendp = sendbuf;
|
|
p = sendp;
|
|
if(c->trace)
|
|
c->trace("send %s", msgPrint((char*)p, (sizeof sendbuf) - (p-sendbuf), m));
|
|
|
|
p[0] = m->tag; // header - fill in size later
|
|
p += 4;
|
|
|
|
switch(m->tag) {
|
|
default:
|
|
tlsError(c, EInternalError, "can't encode a %d", m->tag);
|
|
goto Err;
|
|
case HClientHello:
|
|
// version
|
|
put16(p, m->u.clientHello.version);
|
|
p += 2;
|
|
|
|
// random
|
|
memmove(p, m->u.clientHello.random, RandomSize);
|
|
p += RandomSize;
|
|
|
|
// sid
|
|
n = m->u.clientHello.sid->len;
|
|
assert(n < 256);
|
|
p[0] = n;
|
|
memmove(p+1, m->u.clientHello.sid->data, n);
|
|
p += n+1;
|
|
|
|
n = m->u.clientHello.ciphers->len;
|
|
assert(n > 0 && n < 200);
|
|
put16(p, n*2);
|
|
p += 2;
|
|
for(i=0; i<n; i++) {
|
|
put16(p, m->u.clientHello.ciphers->data[i]);
|
|
p += 2;
|
|
}
|
|
|
|
n = m->u.clientHello.compressors->len;
|
|
assert(n > 0);
|
|
p[0] = n;
|
|
memmove(p+1, m->u.clientHello.compressors->data, n);
|
|
p += n+1;
|
|
break;
|
|
case HServerHello:
|
|
put16(p, m->u.serverHello.version);
|
|
p += 2;
|
|
|
|
// random
|
|
memmove(p, m->u.serverHello.random, RandomSize);
|
|
p += RandomSize;
|
|
|
|
// sid
|
|
n = m->u.serverHello.sid->len;
|
|
assert(n < 256);
|
|
p[0] = n;
|
|
memmove(p+1, m->u.serverHello.sid->data, n);
|
|
p += n+1;
|
|
|
|
put16(p, m->u.serverHello.cipher);
|
|
p += 2;
|
|
p[0] = m->u.serverHello.compressor;
|
|
p += 1;
|
|
break;
|
|
case HServerHelloDone:
|
|
break;
|
|
case HCertificate:
|
|
nn = 0;
|
|
for(i = 0; i < m->u.certificate.ncert; i++)
|
|
nn += 3 + m->u.certificate.certs[i]->len;
|
|
if(p + 3 + nn - sendbuf > sizeof(sendbuf)) {
|
|
tlsError(c, EInternalError, "output buffer too small for certificate");
|
|
goto Err;
|
|
}
|
|
put24(p, nn);
|
|
p += 3;
|
|
for(i = 0; i < m->u.certificate.ncert; i++){
|
|
put24(p, m->u.certificate.certs[i]->len);
|
|
p += 3;
|
|
memmove(p, m->u.certificate.certs[i]->data, m->u.certificate.certs[i]->len);
|
|
p += m->u.certificate.certs[i]->len;
|
|
}
|
|
break;
|
|
case HClientKeyExchange:
|
|
n = m->u.clientKeyExchange.key->len;
|
|
if(c->version != SSL3Version){
|
|
put16(p, n);
|
|
p += 2;
|
|
}
|
|
memmove(p, m->u.clientKeyExchange.key->data, n);
|
|
p += n;
|
|
break;
|
|
case HFinished:
|
|
memmove(p, m->u.finished.verify, m->u.finished.n);
|
|
p += m->u.finished.n;
|
|
break;
|
|
}
|
|
|
|
// go back and fill in size
|
|
n = p-sendp;
|
|
assert(p <= sendbuf+sizeof(sendbuf));
|
|
put24(sendp+1, n-4);
|
|
|
|
// remember hash of Handshake messages
|
|
if(m->tag != HHelloRequest) {
|
|
md5(sendp, n, 0, &c->hsmd5);
|
|
sha1(sendp, n, 0, &c->hssha1);
|
|
}
|
|
|
|
sendp = p;
|
|
if(act == AFlush){
|
|
sendp = sendbuf;
|
|
if(write(c->hand, sendbuf, p-sendbuf) < 0){
|
|
fprint(2, "write error: %r\n");
|
|
goto Err;
|
|
}
|
|
}
|
|
msgClear(m);
|
|
return 1;
|
|
Err:
|
|
msgClear(m);
|
|
return 0;
|
|
}
|
|
|
|
static uchar*
|
|
tlsReadN(TlsConnection *c, int n)
|
|
{
|
|
uchar *p;
|
|
int nn, nr;
|
|
|
|
nn = c->ep - c->rp;
|
|
if(nn < n){
|
|
if(c->rp != c->buf){
|
|
memmove(c->buf, c->rp, nn);
|
|
c->rp = c->buf;
|
|
c->ep = &c->buf[nn];
|
|
}
|
|
for(; nn < n; nn += nr) {
|
|
nr = read(c->hand, &c->rp[nn], n - nn);
|
|
if(nr <= 0)
|
|
return nil;
|
|
c->ep += nr;
|
|
}
|
|
}
|
|
p = c->rp;
|
|
c->rp += n;
|
|
return p;
|
|
}
|
|
|
|
static int
|
|
msgRecv(TlsConnection *c, Msg *m)
|
|
{
|
|
uchar *p;
|
|
int type, n, nn, i, nsid, nrandom, nciph;
|
|
|
|
for(;;) {
|
|
p = tlsReadN(c, 4);
|
|
if(p == nil)
|
|
return 0;
|
|
type = p[0];
|
|
n = get24(p+1);
|
|
|
|
if(type != HHelloRequest)
|
|
break;
|
|
if(n != 0) {
|
|
tlsError(c, EDecodeError, "invalid hello request during handshake");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if(n > sizeof(c->buf)) {
|
|
tlsError(c, EDecodeError, "handshake message too long %d %d", n, sizeof(c->buf));
|
|
return 0;
|
|
}
|
|
|
|
if(type == HSSL2ClientHello){
|
|
/* Cope with an SSL3 ClientHello expressed in SSL2 record format.
|
|
This is sent by some clients that we must interoperate
|
|
with, such as Java's JSSE and Microsoft's Internet Explorer. */
|
|
p = tlsReadN(c, n);
|
|
if(p == nil)
|
|
return 0;
|
|
md5(p, n, 0, &c->hsmd5);
|
|
sha1(p, n, 0, &c->hssha1);
|
|
m->tag = HClientHello;
|
|
if(n < 22)
|
|
goto Short;
|
|
m->u.clientHello.version = get16(p+1);
|
|
p += 3;
|
|
n -= 3;
|
|
nn = get16(p); /* cipher_spec_len */
|
|
nsid = get16(p + 2);
|
|
nrandom = get16(p + 4);
|
|
p += 6;
|
|
n -= 6;
|
|
if(nsid != 0 /* no sid's, since shouldn't restart using ssl2 header */
|
|
|| nrandom < 16 || nn % 3)
|
|
goto Err;
|
|
if(c->trace && (n - nrandom != nn))
|
|
c->trace("n-nrandom!=nn: n=%d nrandom=%d nn=%d\n", n, nrandom, nn);
|
|
/* ignore ssl2 ciphers and look for {0x00, ssl3 cipher} */
|
|
nciph = 0;
|
|
for(i = 0; i < nn; i += 3)
|
|
if(p[i] == 0)
|
|
nciph++;
|
|
m->u.clientHello.ciphers = newints(nciph);
|
|
nciph = 0;
|
|
for(i = 0; i < nn; i += 3)
|
|
if(p[i] == 0)
|
|
m->u.clientHello.ciphers->data[nciph++] = get16(&p[i + 1]);
|
|
p += nn;
|
|
m->u.clientHello.sid = makebytes(nil, 0);
|
|
if(nrandom > RandomSize)
|
|
nrandom = RandomSize;
|
|
memset(m->u.clientHello.random, 0, RandomSize - nrandom);
|
|
memmove(&m->u.clientHello.random[RandomSize - nrandom], p, nrandom);
|
|
m->u.clientHello.compressors = newbytes(1);
|
|
m->u.clientHello.compressors->data[0] = CompressionNull;
|
|
goto Ok;
|
|
}
|
|
|
|
md5(p, 4, 0, &c->hsmd5);
|
|
sha1(p, 4, 0, &c->hssha1);
|
|
|
|
p = tlsReadN(c, n);
|
|
if(p == nil)
|
|
return 0;
|
|
|
|
md5(p, n, 0, &c->hsmd5);
|
|
sha1(p, n, 0, &c->hssha1);
|
|
|
|
m->tag = type;
|
|
|
|
switch(type) {
|
|
default:
|
|
tlsError(c, EUnexpectedMessage, "can't decode a %d", type);
|
|
goto Err;
|
|
case HClientHello:
|
|
if(n < 2)
|
|
goto Short;
|
|
m->u.clientHello.version = get16(p);
|
|
p += 2;
|
|
n -= 2;
|
|
|
|
if(n < RandomSize)
|
|
goto Short;
|
|
memmove(m->u.clientHello.random, p, RandomSize);
|
|
p += RandomSize;
|
|
n -= RandomSize;
|
|
if(n < 1 || n < p[0]+1)
|
|
goto Short;
|
|
m->u.clientHello.sid = makebytes(p+1, p[0]);
|
|
p += m->u.clientHello.sid->len+1;
|
|
n -= m->u.clientHello.sid->len+1;
|
|
|
|
if(n < 2)
|
|
goto Short;
|
|
nn = get16(p);
|
|
p += 2;
|
|
n -= 2;
|
|
|
|
if((nn & 1) || n < nn || nn < 2)
|
|
goto Short;
|
|
m->u.clientHello.ciphers = newints(nn >> 1);
|
|
for(i = 0; i < nn; i += 2)
|
|
m->u.clientHello.ciphers->data[i >> 1] = get16(&p[i]);
|
|
p += nn;
|
|
n -= nn;
|
|
|
|
if(n < 1 || n < p[0]+1 || p[0] == 0)
|
|
goto Short;
|
|
nn = p[0];
|
|
m->u.clientHello.compressors = newbytes(nn);
|
|
memmove(m->u.clientHello.compressors->data, p+1, nn);
|
|
n -= nn + 1;
|
|
break;
|
|
case HServerHello:
|
|
if(n < 2)
|
|
goto Short;
|
|
m->u.serverHello.version = get16(p);
|
|
p += 2;
|
|
n -= 2;
|
|
|
|
if(n < RandomSize)
|
|
goto Short;
|
|
memmove(m->u.serverHello.random, p, RandomSize);
|
|
p += RandomSize;
|
|
n -= RandomSize;
|
|
|
|
if(n < 1 || n < p[0]+1)
|
|
goto Short;
|
|
m->u.serverHello.sid = makebytes(p+1, p[0]);
|
|
p += m->u.serverHello.sid->len+1;
|
|
n -= m->u.serverHello.sid->len+1;
|
|
|
|
if(n < 3)
|
|
goto Short;
|
|
m->u.serverHello.cipher = get16(p);
|
|
m->u.serverHello.compressor = p[2];
|
|
n -= 3;
|
|
break;
|
|
case HCertificate:
|
|
if(n < 3)
|
|
goto Short;
|
|
nn = get24(p);
|
|
p += 3;
|
|
n -= 3;
|
|
if(n != nn)
|
|
goto Short;
|
|
/* certs */
|
|
i = 0;
|
|
while(n > 0) {
|
|
if(n < 3)
|
|
goto Short;
|
|
nn = get24(p);
|
|
p += 3;
|
|
n -= 3;
|
|
if(nn > n)
|
|
goto Short;
|
|
m->u.certificate.ncert = i+1;
|
|
m->u.certificate.certs = erealloc(m->u.certificate.certs, (i+1)*sizeof(Bytes));
|
|
m->u.certificate.certs[i] = makebytes(p, nn);
|
|
p += nn;
|
|
n -= nn;
|
|
i++;
|
|
}
|
|
break;
|
|
case HCertificateRequest:
|
|
if(n < 2)
|
|
goto Short;
|
|
nn = get16(p);
|
|
p += 2;
|
|
n -= 2;
|
|
if(nn < 1 || nn > n)
|
|
goto Short;
|
|
m->u.certificateRequest.types = makebytes(p, nn);
|
|
nn = get24(p);
|
|
p += 3;
|
|
n -= 3;
|
|
if(nn == 0 || n != nn)
|
|
goto Short;
|
|
/* cas */
|
|
i = 0;
|
|
while(n > 0) {
|
|
if(n < 2)
|
|
goto Short;
|
|
nn = get16(p);
|
|
p += 2;
|
|
n -= 2;
|
|
if(nn < 1 || nn > n)
|
|
goto Short;
|
|
m->u.certificateRequest.nca = i+1;
|
|
m->u.certificateRequest.cas = erealloc(m->u.certificateRequest.cas, (i+1)*sizeof(Bytes));
|
|
m->u.certificateRequest.cas[i] = makebytes(p, nn);
|
|
p += nn;
|
|
n -= nn;
|
|
i++;
|
|
}
|
|
break;
|
|
case HServerHelloDone:
|
|
break;
|
|
case HClientKeyExchange:
|
|
/*
|
|
* this message depends upon the encryption selected
|
|
* assume rsa.
|
|
*/
|
|
if(c->version == SSL3Version)
|
|
nn = n;
|
|
else{
|
|
if(n < 2)
|
|
goto Short;
|
|
nn = get16(p);
|
|
p += 2;
|
|
n -= 2;
|
|
}
|
|
if(n < nn)
|
|
goto Short;
|
|
m->u.clientKeyExchange.key = makebytes(p, nn);
|
|
n -= nn;
|
|
break;
|
|
case HFinished:
|
|
m->u.finished.n = c->finished.n;
|
|
if(n < m->u.finished.n)
|
|
goto Short;
|
|
memmove(m->u.finished.verify, p, m->u.finished.n);
|
|
n -= m->u.finished.n;
|
|
break;
|
|
}
|
|
|
|
if(type != HClientHello && n != 0)
|
|
goto Short;
|
|
Ok:
|
|
if(c->trace){
|
|
char buf[8000];
|
|
c->trace("recv %s", msgPrint(buf, sizeof buf, m));
|
|
}
|
|
return 1;
|
|
Short:
|
|
tlsError(c, EDecodeError, "handshake message has invalid length");
|
|
Err:
|
|
msgClear(m);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
msgClear(Msg *m)
|
|
{
|
|
int i;
|
|
|
|
switch(m->tag) {
|
|
default:
|
|
sysfatal("msgClear: unknown message type: %d\n", m->tag);
|
|
case HHelloRequest:
|
|
break;
|
|
case HClientHello:
|
|
freebytes(m->u.clientHello.sid);
|
|
freeints(m->u.clientHello.ciphers);
|
|
freebytes(m->u.clientHello.compressors);
|
|
break;
|
|
case HServerHello:
|
|
freebytes(m->u.clientHello.sid);
|
|
break;
|
|
case HCertificate:
|
|
for(i=0; i<m->u.certificate.ncert; i++)
|
|
freebytes(m->u.certificate.certs[i]);
|
|
free(m->u.certificate.certs);
|
|
break;
|
|
case HCertificateRequest:
|
|
freebytes(m->u.certificateRequest.types);
|
|
for(i=0; i<m->u.certificateRequest.nca; i++)
|
|
freebytes(m->u.certificateRequest.cas[i]);
|
|
free(m->u.certificateRequest.cas);
|
|
break;
|
|
case HServerHelloDone:
|
|
break;
|
|
case HClientKeyExchange:
|
|
freebytes(m->u.clientKeyExchange.key);
|
|
break;
|
|
case HFinished:
|
|
break;
|
|
}
|
|
memset(m, 0, sizeof(Msg));
|
|
}
|
|
|
|
static char *
|
|
bytesPrint(char *bs, char *be, char *s0, Bytes *b, char *s1)
|
|
{
|
|
int i;
|
|
|
|
if(s0)
|
|
bs = seprint(bs, be, "%s", s0);
|
|
bs = seprint(bs, be, "[");
|
|
if(b == nil)
|
|
bs = seprint(bs, be, "nil");
|
|
else
|
|
for(i=0; i<b->len; i++)
|
|
bs = seprint(bs, be, "%.2x ", b->data[i]);
|
|
bs = seprint(bs, be, "]");
|
|
if(s1)
|
|
bs = seprint(bs, be, "%s", s1);
|
|
return bs;
|
|
}
|
|
|
|
static char *
|
|
intsPrint(char *bs, char *be, char *s0, Ints *b, char *s1)
|
|
{
|
|
int i;
|
|
|
|
if(s0)
|
|
bs = seprint(bs, be, "%s", s0);
|
|
bs = seprint(bs, be, "[");
|
|
if(b == nil)
|
|
bs = seprint(bs, be, "nil");
|
|
else
|
|
for(i=0; i<b->len; i++)
|
|
bs = seprint(bs, be, "%x ", b->data[i]);
|
|
bs = seprint(bs, be, "]");
|
|
if(s1)
|
|
bs = seprint(bs, be, "%s", s1);
|
|
return bs;
|
|
}
|
|
|
|
static char*
|
|
msgPrint(char *buf, int n, Msg *m)
|
|
{
|
|
int i;
|
|
char *bs = buf, *be = buf+n;
|
|
|
|
switch(m->tag) {
|
|
default:
|
|
bs = seprint(bs, be, "unknown %d\n", m->tag);
|
|
break;
|
|
case HClientHello:
|
|
bs = seprint(bs, be, "ClientHello\n");
|
|
bs = seprint(bs, be, "\tversion: %.4x\n", m->u.clientHello.version);
|
|
bs = seprint(bs, be, "\trandom: ");
|
|
for(i=0; i<RandomSize; i++)
|
|
bs = seprint(bs, be, "%.2x", m->u.clientHello.random[i]);
|
|
bs = seprint(bs, be, "\n");
|
|
bs = bytesPrint(bs, be, "\tsid: ", m->u.clientHello.sid, "\n");
|
|
bs = intsPrint(bs, be, "\tciphers: ", m->u.clientHello.ciphers, "\n");
|
|
bs = bytesPrint(bs, be, "\tcompressors: ", m->u.clientHello.compressors, "\n");
|
|
break;
|
|
case HServerHello:
|
|
bs = seprint(bs, be, "ServerHello\n");
|
|
bs = seprint(bs, be, "\tversion: %.4x\n", m->u.serverHello.version);
|
|
bs = seprint(bs, be, "\trandom: ");
|
|
for(i=0; i<RandomSize; i++)
|
|
bs = seprint(bs, be, "%.2x", m->u.serverHello.random[i]);
|
|
bs = seprint(bs, be, "\n");
|
|
bs = bytesPrint(bs, be, "\tsid: ", m->u.serverHello.sid, "\n");
|
|
bs = seprint(bs, be, "\tcipher: %.4x\n", m->u.serverHello.cipher);
|
|
bs = seprint(bs, be, "\tcompressor: %.2x\n", m->u.serverHello.compressor);
|
|
break;
|
|
case HCertificate:
|
|
bs = seprint(bs, be, "Certificate\n");
|
|
for(i=0; i<m->u.certificate.ncert; i++)
|
|
bs = bytesPrint(bs, be, "\t", m->u.certificate.certs[i], "\n");
|
|
break;
|
|
case HCertificateRequest:
|
|
bs = seprint(bs, be, "CertificateRequest\n");
|
|
bs = bytesPrint(bs, be, "\ttypes: ", m->u.certificateRequest.types, "\n");
|
|
bs = seprint(bs, be, "\tcertificateauthorities\n");
|
|
for(i=0; i<m->u.certificateRequest.nca; i++)
|
|
bs = bytesPrint(bs, be, "\t\t", m->u.certificateRequest.cas[i], "\n");
|
|
break;
|
|
case HServerHelloDone:
|
|
bs = seprint(bs, be, "ServerHelloDone\n");
|
|
break;
|
|
case HClientKeyExchange:
|
|
bs = seprint(bs, be, "HClientKeyExchange\n");
|
|
bs = bytesPrint(bs, be, "\tkey: ", m->u.clientKeyExchange.key, "\n");
|
|
break;
|
|
case HFinished:
|
|
bs = seprint(bs, be, "HFinished\n");
|
|
for(i=0; i<m->u.finished.n; i++)
|
|
bs = seprint(bs, be, "%.2x", m->u.finished.verify[i]);
|
|
bs = seprint(bs, be, "\n");
|
|
break;
|
|
}
|
|
USED(bs);
|
|
return buf;
|
|
}
|
|
|
|
static void
|
|
tlsError(TlsConnection *c, int err, char *fmt, ...)
|
|
{
|
|
char msg[512];
|
|
va_list arg;
|
|
|
|
va_start(arg, fmt);
|
|
vseprint(msg, msg+sizeof(msg), fmt, arg);
|
|
va_end(arg);
|
|
if(c->trace)
|
|
c->trace("tlsError: %s\n", msg);
|
|
else if(c->erred)
|
|
fprint(2, "double error: %r, %s", msg);
|
|
else
|
|
werrstr("tls: local %s", msg);
|
|
c->erred = 1;
|
|
fprint(c->ctl, "alert %d", err);
|
|
}
|
|
|
|
// commit to specific version number
|
|
static int
|
|
setVersion(TlsConnection *c, int version)
|
|
{
|
|
if(c->verset || version > MaxProtoVersion || version < MinProtoVersion)
|
|
return -1;
|
|
if(version > c->version)
|
|
version = c->version;
|
|
if(version == SSL3Version) {
|
|
c->version = version;
|
|
c->finished.n = SSL3FinishedLen;
|
|
}else if(version == TLSVersion){
|
|
c->version = version;
|
|
c->finished.n = TLSFinishedLen;
|
|
}else
|
|
return -1;
|
|
c->verset = 1;
|
|
return fprint(c->ctl, "version 0x%x", version);
|
|
}
|
|
|
|
// confirm that received Finished message matches the expected value
|
|
static int
|
|
finishedMatch(TlsConnection *c, Finished *f)
|
|
{
|
|
return memcmp(f->verify, c->finished.verify, f->n) == 0;
|
|
}
|
|
|
|
// free memory associated with TlsConnection struct
|
|
// (but don't close the TLS channel itself)
|
|
static void
|
|
tlsConnectionFree(TlsConnection *c)
|
|
{
|
|
tlsSecClose(c->sec);
|
|
freebytes(c->sid);
|
|
freebytes(c->cert);
|
|
memset(c, 0, sizeof(c));
|
|
free(c);
|
|
}
|
|
|
|
|
|
//================= cipher choices ========================
|
|
|
|
static int weakCipher[CipherMax] =
|
|
{
|
|
1, /* TLS_NULL_WITH_NULL_NULL */
|
|
1, /* TLS_RSA_WITH_NULL_MD5 */
|
|
1, /* TLS_RSA_WITH_NULL_SHA */
|
|
1, /* TLS_RSA_EXPORT_WITH_RC4_40_MD5 */
|
|
0, /* TLS_RSA_WITH_RC4_128_MD5 */
|
|
0, /* TLS_RSA_WITH_RC4_128_SHA */
|
|
1, /* TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5 */
|
|
0, /* TLS_RSA_WITH_IDEA_CBC_SHA */
|
|
1, /* TLS_RSA_EXPORT_WITH_DES40_CBC_SHA */
|
|
0, /* TLS_RSA_WITH_DES_CBC_SHA */
|
|
0, /* TLS_RSA_WITH_3DES_EDE_CBC_SHA */
|
|
1, /* TLS_DH_DSS_EXPORT_WITH_DES40_CBC_SHA */
|
|
0, /* TLS_DH_DSS_WITH_DES_CBC_SHA */
|
|
0, /* TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA */
|
|
1, /* TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA */
|
|
0, /* TLS_DH_RSA_WITH_DES_CBC_SHA */
|
|
0, /* TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA */
|
|
1, /* TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA */
|
|
0, /* TLS_DHE_DSS_WITH_DES_CBC_SHA */
|
|
0, /* TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA */
|
|
1, /* TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA */
|
|
0, /* TLS_DHE_RSA_WITH_DES_CBC_SHA */
|
|
0, /* TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA */
|
|
1, /* TLS_DH_anon_EXPORT_WITH_RC4_40_MD5 */
|
|
1, /* TLS_DH_anon_WITH_RC4_128_MD5 */
|
|
1, /* TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA */
|
|
1, /* TLS_DH_anon_WITH_DES_CBC_SHA */
|
|
1, /* TLS_DH_anon_WITH_3DES_EDE_CBC_SHA */
|
|
};
|
|
|
|
static int
|
|
setAlgs(TlsConnection *c, int a)
|
|
{
|
|
int i;
|
|
|
|
for(i = 0; i < nelem(cipherAlgs); i++){
|
|
if(cipherAlgs[i].tlsid == a){
|
|
c->enc = cipherAlgs[i].enc;
|
|
c->digest = cipherAlgs[i].digest;
|
|
c->nsecret = cipherAlgs[i].nsecret;
|
|
if(c->nsecret > MaxKeyData)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
okCipher(Ints *cv)
|
|
{
|
|
int weak, i, j, c;
|
|
|
|
weak = 1;
|
|
for(i = 0; i < cv->len; i++) {
|
|
c = cv->data[i];
|
|
if(c >= CipherMax)
|
|
weak = 0;
|
|
else
|
|
weak &= weakCipher[c];
|
|
for(j = 0; j < nelem(cipherAlgs); j++)
|
|
if(cipherAlgs[j].ok && cipherAlgs[j].tlsid == c)
|
|
return c;
|
|
}
|
|
if(weak)
|
|
return -2;
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
okCompression(Bytes *cv)
|
|
{
|
|
int i, j, c;
|
|
|
|
for(i = 0; i < cv->len; i++) {
|
|
c = cv->data[i];
|
|
for(j = 0; j < nelem(compressors); j++) {
|
|
if(compressors[j] == c)
|
|
return c;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static Lock ciphLock;
|
|
static int nciphers;
|
|
|
|
static int
|
|
initCiphers(void)
|
|
{
|
|
enum {MaxAlgF = 1024, MaxAlgs = 10};
|
|
char s[MaxAlgF], *flds[MaxAlgs];
|
|
int i, j, n, ok;
|
|
|
|
lock(&ciphLock);
|
|
if(nciphers){
|
|
unlock(&ciphLock);
|
|
return nciphers;
|
|
}
|
|
j = open("#a/tls/encalgs", OREAD);
|
|
if(j < 0){
|
|
werrstr("can't open #a/tls/encalgs: %r");
|
|
return 0;
|
|
}
|
|
n = read(j, s, MaxAlgF-1);
|
|
close(j);
|
|
if(n <= 0){
|
|
werrstr("nothing in #a/tls/encalgs: %r");
|
|
return 0;
|
|
}
|
|
s[n] = 0;
|
|
n = getfields(s, flds, MaxAlgs, 1, " \t\r\n");
|
|
for(i = 0; i < nelem(cipherAlgs); i++){
|
|
ok = 0;
|
|
for(j = 0; j < n; j++){
|
|
if(strcmp(cipherAlgs[i].enc, flds[j]) == 0){
|
|
ok = 1;
|
|
break;
|
|
}
|
|
}
|
|
cipherAlgs[i].ok = ok;
|
|
}
|
|
|
|
j = open("#a/tls/hashalgs", OREAD);
|
|
if(j < 0){
|
|
werrstr("can't open #a/tls/hashalgs: %r");
|
|
return 0;
|
|
}
|
|
n = read(j, s, MaxAlgF-1);
|
|
close(j);
|
|
if(n <= 0){
|
|
werrstr("nothing in #a/tls/hashalgs: %r");
|
|
return 0;
|
|
}
|
|
s[n] = 0;
|
|
n = getfields(s, flds, MaxAlgs, 1, " \t\r\n");
|
|
for(i = 0; i < nelem(cipherAlgs); i++){
|
|
ok = 0;
|
|
for(j = 0; j < n; j++){
|
|
if(strcmp(cipherAlgs[i].digest, flds[j]) == 0){
|
|
ok = 1;
|
|
break;
|
|
}
|
|
}
|
|
cipherAlgs[i].ok &= ok;
|
|
if(cipherAlgs[i].ok)
|
|
nciphers++;
|
|
}
|
|
unlock(&ciphLock);
|
|
return nciphers;
|
|
}
|
|
|
|
static Ints*
|
|
makeciphers(void)
|
|
{
|
|
Ints *is;
|
|
int i, j;
|
|
|
|
is = newints(nciphers);
|
|
j = 0;
|
|
for(i = 0; i < nelem(cipherAlgs); i++){
|
|
if(cipherAlgs[i].ok)
|
|
is->data[j++] = cipherAlgs[i].tlsid;
|
|
}
|
|
return is;
|
|
}
|
|
|
|
|
|
|
|
//================= security functions ========================
|
|
|
|
// given X.509 certificate, set up connection to factotum
|
|
// for using corresponding private key
|
|
static AuthRpc*
|
|
factotum_rsa_open(uchar *cert, int certlen)
|
|
{
|
|
int afd;
|
|
char *s;
|
|
mpint *pub = nil;
|
|
RSApub *rsapub;
|
|
AuthRpc *rpc;
|
|
|
|
// start talking to factotum
|
|
if((afd = open("/mnt/factotum/rpc", ORDWR)) < 0)
|
|
return nil;
|
|
if((rpc = auth_allocrpc(afd)) == nil){
|
|
close(afd);
|
|
return nil;
|
|
}
|
|
s = "proto=rsa service=tls role=client";
|
|
if(auth_rpc(rpc, "start", s, strlen(s)) != ARok){
|
|
factotum_rsa_close(rpc);
|
|
return nil;
|
|
}
|
|
|
|
// roll factotum keyring around to match certificate
|
|
rsapub = X509toRSApub(cert, certlen, nil, 0);
|
|
while(1){
|
|
if(auth_rpc(rpc, "read", nil, 0) != ARok){
|
|
factotum_rsa_close(rpc);
|
|
rpc = nil;
|
|
goto done;
|
|
}
|
|
pub = strtomp(rpc->arg, nil, 16, nil);
|
|
assert(pub != nil);
|
|
if(mpcmp(pub,rsapub->n) == 0)
|
|
break;
|
|
}
|
|
done:
|
|
mpfree(pub);
|
|
rsapubfree(rsapub);
|
|
return rpc;
|
|
}
|
|
|
|
static mpint*
|
|
factotum_rsa_decrypt(AuthRpc *rpc, mpint *cipher)
|
|
{
|
|
char *p;
|
|
int rv;
|
|
|
|
if((p = mptoa(cipher, 16, nil, 0)) == nil)
|
|
return nil;
|
|
rv = auth_rpc(rpc, "write", p, strlen(p));
|
|
free(p);
|
|
if(rv != ARok || auth_rpc(rpc, "read", nil, 0) != ARok)
|
|
return nil;
|
|
mpfree(cipher);
|
|
return strtomp(rpc->arg, nil, 16, nil);
|
|
}
|
|
|
|
static void
|
|
factotum_rsa_close(AuthRpc*rpc)
|
|
{
|
|
if(!rpc)
|
|
return;
|
|
close(rpc->afd);
|
|
auth_freerpc(rpc);
|
|
}
|
|
|
|
static void
|
|
tlsPmd5(uchar *buf, int nbuf, uchar *key, int nkey, uchar *label, int nlabel, uchar *seed0, int nseed0, uchar *seed1, int nseed1)
|
|
{
|
|
uchar ai[MD5dlen], tmp[MD5dlen];
|
|
int i, n;
|
|
MD5state *s;
|
|
|
|
// generate a1
|
|
s = hmac_md5(label, nlabel, key, nkey, nil, nil);
|
|
s = hmac_md5(seed0, nseed0, key, nkey, nil, s);
|
|
hmac_md5(seed1, nseed1, key, nkey, ai, s);
|
|
|
|
while(nbuf > 0) {
|
|
s = hmac_md5(ai, MD5dlen, key, nkey, nil, nil);
|
|
s = hmac_md5(label, nlabel, key, nkey, nil, s);
|
|
s = hmac_md5(seed0, nseed0, key, nkey, nil, s);
|
|
hmac_md5(seed1, nseed1, key, nkey, tmp, s);
|
|
n = MD5dlen;
|
|
if(n > nbuf)
|
|
n = nbuf;
|
|
for(i = 0; i < n; i++)
|
|
buf[i] ^= tmp[i];
|
|
buf += n;
|
|
nbuf -= n;
|
|
hmac_md5(ai, MD5dlen, key, nkey, tmp, nil);
|
|
memmove(ai, tmp, MD5dlen);
|
|
}
|
|
}
|
|
|
|
static void
|
|
tlsPsha1(uchar *buf, int nbuf, uchar *key, int nkey, uchar *label, int nlabel, uchar *seed0, int nseed0, uchar *seed1, int nseed1)
|
|
{
|
|
uchar ai[SHA1dlen], tmp[SHA1dlen];
|
|
int i, n;
|
|
SHAstate *s;
|
|
|
|
// generate a1
|
|
s = hmac_sha1(label, nlabel, key, nkey, nil, nil);
|
|
s = hmac_sha1(seed0, nseed0, key, nkey, nil, s);
|
|
hmac_sha1(seed1, nseed1, key, nkey, ai, s);
|
|
|
|
while(nbuf > 0) {
|
|
s = hmac_sha1(ai, SHA1dlen, key, nkey, nil, nil);
|
|
s = hmac_sha1(label, nlabel, key, nkey, nil, s);
|
|
s = hmac_sha1(seed0, nseed0, key, nkey, nil, s);
|
|
hmac_sha1(seed1, nseed1, key, nkey, tmp, s);
|
|
n = SHA1dlen;
|
|
if(n > nbuf)
|
|
n = nbuf;
|
|
for(i = 0; i < n; i++)
|
|
buf[i] ^= tmp[i];
|
|
buf += n;
|
|
nbuf -= n;
|
|
hmac_sha1(ai, SHA1dlen, key, nkey, tmp, nil);
|
|
memmove(ai, tmp, SHA1dlen);
|
|
}
|
|
}
|
|
|
|
// fill buf with md5(args)^sha1(args)
|
|
static void
|
|
tlsPRF(uchar *buf, int nbuf, uchar *key, int nkey, char *label, uchar *seed0, int nseed0, uchar *seed1, int nseed1)
|
|
{
|
|
int i;
|
|
int nlabel = strlen(label);
|
|
int n = (nkey + 1) >> 1;
|
|
|
|
for(i = 0; i < nbuf; i++)
|
|
buf[i] = 0;
|
|
tlsPmd5(buf, nbuf, key, n, (uchar*)label, nlabel, seed0, nseed0, seed1, nseed1);
|
|
tlsPsha1(buf, nbuf, key+nkey-n, n, (uchar*)label, nlabel, seed0, nseed0, seed1, nseed1);
|
|
}
|
|
|
|
/*
|
|
* for setting server session id's
|
|
*/
|
|
static Lock sidLock;
|
|
static long maxSid = 1;
|
|
|
|
/* the keys are verified to have the same public components
|
|
* and to function correctly with pkcs 1 encryption and decryption. */
|
|
static TlsSec*
|
|
tlsSecInits(int cvers, uchar *csid, int ncsid, uchar *crandom, uchar *ssid, int *nssid, uchar *srandom)
|
|
{
|
|
TlsSec *sec = emalloc(sizeof(*sec));
|
|
|
|
USED(csid); USED(ncsid); // ignore csid for now
|
|
|
|
memmove(sec->crandom, crandom, RandomSize);
|
|
sec->clientVers = cvers;
|
|
|
|
put32(sec->srandom, time(0));
|
|
genrandom(sec->srandom+4, RandomSize-4);
|
|
memmove(srandom, sec->srandom, RandomSize);
|
|
|
|
/*
|
|
* make up a unique sid: use our pid, and and incrementing id
|
|
* can signal no sid by setting nssid to 0.
|
|
*/
|
|
memset(ssid, 0, SidSize);
|
|
put32(ssid, getpid());
|
|
lock(&sidLock);
|
|
put32(ssid+4, maxSid++);
|
|
unlock(&sidLock);
|
|
*nssid = SidSize;
|
|
return sec;
|
|
}
|
|
|
|
static int
|
|
tlsSecSecrets(TlsSec *sec, int vers, uchar *epm, int nepm, uchar *kd, int nkd)
|
|
{
|
|
if(epm != nil){
|
|
if(setVers(sec, vers) < 0)
|
|
goto Err;
|
|
serverMasterSecret(sec, epm, nepm);
|
|
}else if(sec->vers != vers){
|
|
werrstr("mismatched session versions");
|
|
goto Err;
|
|
}
|
|
setSecrets(sec, kd, nkd);
|
|
return 0;
|
|
Err:
|
|
sec->ok = -1;
|
|
return -1;
|
|
}
|
|
|
|
static TlsSec*
|
|
tlsSecInitc(int cvers, uchar *crandom)
|
|
{
|
|
TlsSec *sec = emalloc(sizeof(*sec));
|
|
sec->clientVers = cvers;
|
|
put32(sec->crandom, time(0));
|
|
genrandom(sec->crandom+4, RandomSize-4);
|
|
memmove(crandom, sec->crandom, RandomSize);
|
|
return sec;
|
|
}
|
|
|
|
static int
|
|
tlsSecSecretc(TlsSec *sec, uchar *sid, int nsid, uchar *srandom, uchar *cert, int ncert, int vers, uchar **epm, int *nepm, uchar *kd, int nkd)
|
|
{
|
|
RSApub *pub;
|
|
|
|
pub = nil;
|
|
|
|
USED(sid);
|
|
USED(nsid);
|
|
|
|
memmove(sec->srandom, srandom, RandomSize);
|
|
|
|
if(setVers(sec, vers) < 0)
|
|
goto Err;
|
|
|
|
pub = X509toRSApub(cert, ncert, nil, 0);
|
|
if(pub == nil){
|
|
werrstr("invalid x509/rsa certificate");
|
|
goto Err;
|
|
}
|
|
if(clientMasterSecret(sec, pub, epm, nepm) < 0)
|
|
goto Err;
|
|
rsapubfree(pub);
|
|
setSecrets(sec, kd, nkd);
|
|
return 0;
|
|
|
|
Err:
|
|
if(pub != nil)
|
|
rsapubfree(pub);
|
|
sec->ok = -1;
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
tlsSecFinished(TlsSec *sec, MD5state md5, SHAstate sha1, uchar *fin, int nfin, int isclient)
|
|
{
|
|
if(sec->nfin != nfin){
|
|
sec->ok = -1;
|
|
werrstr("invalid finished exchange");
|
|
return -1;
|
|
}
|
|
md5.malloced = 0;
|
|
sha1.malloced = 0;
|
|
(*sec->setFinished)(sec, md5, sha1, fin, isclient);
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
tlsSecOk(TlsSec *sec)
|
|
{
|
|
if(sec->ok == 0)
|
|
sec->ok = 1;
|
|
}
|
|
|
|
static void
|
|
tlsSecKill(TlsSec *sec)
|
|
{
|
|
if(!sec)
|
|
return;
|
|
factotum_rsa_close(sec->rpc);
|
|
sec->ok = -1;
|
|
}
|
|
|
|
static void
|
|
tlsSecClose(TlsSec *sec)
|
|
{
|
|
if(!sec)
|
|
return;
|
|
factotum_rsa_close(sec->rpc);
|
|
free(sec->server);
|
|
free(sec);
|
|
}
|
|
|
|
static int
|
|
setVers(TlsSec *sec, int v)
|
|
{
|
|
if(v == SSL3Version){
|
|
sec->setFinished = sslSetFinished;
|
|
sec->nfin = SSL3FinishedLen;
|
|
sec->prf = sslPRF;
|
|
}else if(v == TLSVersion){
|
|
sec->setFinished = tlsSetFinished;
|
|
sec->nfin = TLSFinishedLen;
|
|
sec->prf = tlsPRF;
|
|
}else{
|
|
werrstr("invalid version");
|
|
return -1;
|
|
}
|
|
sec->vers = v;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* generate secret keys from the master secret.
|
|
*
|
|
* different crypto selections will require different amounts
|
|
* of key expansion and use of key expansion data,
|
|
* but it's all generated using the same function.
|
|
*/
|
|
static void
|
|
setSecrets(TlsSec *sec, uchar *kd, int nkd)
|
|
{
|
|
(*sec->prf)(kd, nkd, sec->sec, MasterSecretSize, "key expansion",
|
|
sec->srandom, RandomSize, sec->crandom, RandomSize);
|
|
}
|
|
|
|
/*
|
|
* set the master secret from the pre-master secret.
|
|
*/
|
|
static void
|
|
setMasterSecret(TlsSec *sec, Bytes *pm)
|
|
{
|
|
(*sec->prf)(sec->sec, MasterSecretSize, pm->data, MasterSecretSize, "master secret",
|
|
sec->crandom, RandomSize, sec->srandom, RandomSize);
|
|
}
|
|
|
|
static void
|
|
serverMasterSecret(TlsSec *sec, uchar *epm, int nepm)
|
|
{
|
|
Bytes *pm;
|
|
|
|
pm = pkcs1_decrypt(sec, epm, nepm);
|
|
|
|
// if the client messed up, just continue as if everything is ok,
|
|
// to prevent attacks to check for correctly formatted messages.
|
|
// Hence the fprint(2,) can't be replaced by tlsError(), which sends an Alert msg to the client.
|
|
if(sec->ok < 0 || pm == nil || get16(pm->data) != sec->clientVers){
|
|
fprint(2, "serverMasterSecret failed ok=%d pm=%p pmvers=%x cvers=%x nepm=%d\n",
|
|
sec->ok, pm, pm ? get16(pm->data) : -1, sec->clientVers, nepm);
|
|
sec->ok = -1;
|
|
if(pm != nil)
|
|
freebytes(pm);
|
|
pm = newbytes(MasterSecretSize);
|
|
genrandom(pm->data, MasterSecretSize);
|
|
}
|
|
setMasterSecret(sec, pm);
|
|
memset(pm->data, 0, pm->len);
|
|
freebytes(pm);
|
|
}
|
|
|
|
static int
|
|
clientMasterSecret(TlsSec *sec, RSApub *pub, uchar **epm, int *nepm)
|
|
{
|
|
Bytes *pm, *key;
|
|
|
|
pm = newbytes(MasterSecretSize);
|
|
put16(pm->data, sec->clientVers);
|
|
genrandom(pm->data+2, MasterSecretSize - 2);
|
|
|
|
setMasterSecret(sec, pm);
|
|
|
|
key = pkcs1_encrypt(pm, pub, 2);
|
|
memset(pm->data, 0, pm->len);
|
|
freebytes(pm);
|
|
if(key == nil){
|
|
werrstr("tls pkcs1_encrypt failed");
|
|
return -1;
|
|
}
|
|
|
|
*nepm = key->len;
|
|
*epm = malloc(*nepm);
|
|
if(*epm == nil){
|
|
freebytes(key);
|
|
werrstr("out of memory");
|
|
return -1;
|
|
}
|
|
memmove(*epm, key->data, *nepm);
|
|
|
|
freebytes(key);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
sslSetFinished(TlsSec *sec, MD5state hsmd5, SHAstate hssha1, uchar *finished, int isClient)
|
|
{
|
|
DigestState *s;
|
|
uchar h0[MD5dlen], h1[SHA1dlen], pad[48];
|
|
char *label;
|
|
|
|
if(isClient)
|
|
label = "CLNT";
|
|
else
|
|
label = "SRVR";
|
|
|
|
md5((uchar*)label, 4, nil, &hsmd5);
|
|
md5(sec->sec, MasterSecretSize, nil, &hsmd5);
|
|
memset(pad, 0x36, 48);
|
|
md5(pad, 48, nil, &hsmd5);
|
|
md5(nil, 0, h0, &hsmd5);
|
|
memset(pad, 0x5C, 48);
|
|
s = md5(sec->sec, MasterSecretSize, nil, nil);
|
|
s = md5(pad, 48, nil, s);
|
|
md5(h0, MD5dlen, finished, s);
|
|
|
|
sha1((uchar*)label, 4, nil, &hssha1);
|
|
sha1(sec->sec, MasterSecretSize, nil, &hssha1);
|
|
memset(pad, 0x36, 40);
|
|
sha1(pad, 40, nil, &hssha1);
|
|
sha1(nil, 0, h1, &hssha1);
|
|
memset(pad, 0x5C, 40);
|
|
s = sha1(sec->sec, MasterSecretSize, nil, nil);
|
|
s = sha1(pad, 40, nil, s);
|
|
sha1(h1, SHA1dlen, finished + MD5dlen, s);
|
|
}
|
|
|
|
// fill "finished" arg with md5(args)^sha1(args)
|
|
static void
|
|
tlsSetFinished(TlsSec *sec, MD5state hsmd5, SHAstate hssha1, uchar *finished, int isClient)
|
|
{
|
|
uchar h0[MD5dlen], h1[SHA1dlen];
|
|
char *label;
|
|
|
|
// get current hash value, but allow further messages to be hashed in
|
|
md5(nil, 0, h0, &hsmd5);
|
|
sha1(nil, 0, h1, &hssha1);
|
|
|
|
if(isClient)
|
|
label = "client finished";
|
|
else
|
|
label = "server finished";
|
|
tlsPRF(finished, TLSFinishedLen, sec->sec, MasterSecretSize, label, h0, MD5dlen, h1, SHA1dlen);
|
|
}
|
|
|
|
static void
|
|
sslPRF(uchar *buf, int nbuf, uchar *key, int nkey, char *label, uchar *seed0, int nseed0, uchar *seed1, int nseed1)
|
|
{
|
|
DigestState *s;
|
|
uchar sha1dig[SHA1dlen], md5dig[MD5dlen], tmp[26];
|
|
int i, n, len;
|
|
|
|
USED(label);
|
|
len = 1;
|
|
while(nbuf > 0){
|
|
if(len > 26)
|
|
return;
|
|
for(i = 0; i < len; i++)
|
|
tmp[i] = 'A' - 1 + len;
|
|
s = sha1(tmp, len, nil, nil);
|
|
s = sha1(key, nkey, nil, s);
|
|
s = sha1(seed0, nseed0, nil, s);
|
|
sha1(seed1, nseed1, sha1dig, s);
|
|
s = md5(key, nkey, nil, nil);
|
|
md5(sha1dig, SHA1dlen, md5dig, s);
|
|
n = MD5dlen;
|
|
if(n > nbuf)
|
|
n = nbuf;
|
|
memmove(buf, md5dig, n);
|
|
buf += n;
|
|
nbuf -= n;
|
|
len++;
|
|
}
|
|
}
|
|
|
|
static mpint*
|
|
bytestomp(Bytes* bytes)
|
|
{
|
|
mpint* ans;
|
|
|
|
ans = betomp(bytes->data, bytes->len, nil);
|
|
return ans;
|
|
}
|
|
|
|
/*
|
|
* Convert mpint* to Bytes, putting high order byte first.
|
|
*/
|
|
static Bytes*
|
|
mptobytes(mpint* big)
|
|
{
|
|
int n, m;
|
|
uchar *a;
|
|
Bytes* ans;
|
|
|
|
n = (mpsignif(big)+7)/8;
|
|
m = mptobe(big, nil, n, &a);
|
|
ans = makebytes(a, m);
|
|
return ans;
|
|
}
|
|
|
|
// Do RSA computation on block according to key, and pad
|
|
// result on left with zeros to make it modlen long.
|
|
static Bytes*
|
|
rsacomp(Bytes* block, RSApub* key, int modlen)
|
|
{
|
|
mpint *x, *y;
|
|
Bytes *a, *ybytes;
|
|
int ylen;
|
|
|
|
x = bytestomp(block);
|
|
y = rsaencrypt(key, x, nil);
|
|
mpfree(x);
|
|
ybytes = mptobytes(y);
|
|
ylen = ybytes->len;
|
|
|
|
if(ylen < modlen) {
|
|
a = newbytes(modlen);
|
|
memset(a->data, 0, modlen-ylen);
|
|
memmove(a->data+modlen-ylen, ybytes->data, ylen);
|
|
freebytes(ybytes);
|
|
ybytes = a;
|
|
}
|
|
else if(ylen > modlen) {
|
|
// assume it has leading zeros (mod should make it so)
|
|
a = newbytes(modlen);
|
|
memmove(a->data, ybytes->data, modlen);
|
|
freebytes(ybytes);
|
|
ybytes = a;
|
|
}
|
|
mpfree(y);
|
|
return ybytes;
|
|
}
|
|
|
|
// encrypt data according to PKCS#1, /lib/rfc/rfc2437 9.1.2.1
|
|
static Bytes*
|
|
pkcs1_encrypt(Bytes* data, RSApub* key, int blocktype)
|
|
{
|
|
Bytes *pad, *eb, *ans;
|
|
int i, dlen, padlen, modlen;
|
|
|
|
modlen = (mpsignif(key->n)+7)/8;
|
|
dlen = data->len;
|
|
if(modlen < 12 || dlen > modlen - 11)
|
|
return nil;
|
|
padlen = modlen - 3 - dlen;
|
|
pad = newbytes(padlen);
|
|
genrandom(pad->data, padlen);
|
|
for(i = 0; i < padlen; i++) {
|
|
if(blocktype == 0)
|
|
pad->data[i] = 0;
|
|
else if(blocktype == 1)
|
|
pad->data[i] = 255;
|
|
else if(pad->data[i] == 0)
|
|
pad->data[i] = 1;
|
|
}
|
|
eb = newbytes(modlen);
|
|
eb->data[0] = 0;
|
|
eb->data[1] = blocktype;
|
|
memmove(eb->data+2, pad->data, padlen);
|
|
eb->data[padlen+2] = 0;
|
|
memmove(eb->data+padlen+3, data->data, dlen);
|
|
ans = rsacomp(eb, key, modlen);
|
|
freebytes(eb);
|
|
freebytes(pad);
|
|
return ans;
|
|
}
|
|
|
|
// decrypt data according to PKCS#1, with given key.
|
|
// expect a block type of 2.
|
|
static Bytes*
|
|
pkcs1_decrypt(TlsSec *sec, uchar *epm, int nepm)
|
|
{
|
|
Bytes *eb, *ans = nil;
|
|
int i, modlen;
|
|
mpint *x, *y;
|
|
|
|
modlen = (mpsignif(sec->rsapub->n)+7)/8;
|
|
if(nepm != modlen)
|
|
return nil;
|
|
x = betomp(epm, nepm, nil);
|
|
y = factotum_rsa_decrypt(sec->rpc, x);
|
|
if(y == nil)
|
|
return nil;
|
|
eb = mptobytes(y);
|
|
if(eb->len < modlen){ // pad on left with zeros
|
|
ans = newbytes(modlen);
|
|
memset(ans->data, 0, modlen-eb->len);
|
|
memmove(ans->data+modlen-eb->len, eb->data, eb->len);
|
|
freebytes(eb);
|
|
eb = ans;
|
|
}
|
|
if(eb->data[0] == 0 && eb->data[1] == 2) {
|
|
for(i = 2; i < modlen; i++)
|
|
if(eb->data[i] == 0)
|
|
break;
|
|
if(i < modlen - 1)
|
|
ans = makebytes(eb->data+i+1, modlen-(i+1));
|
|
}
|
|
freebytes(eb);
|
|
return ans;
|
|
}
|
|
|
|
|
|
//================= general utility functions ========================
|
|
|
|
static void *
|
|
emalloc(int n)
|
|
{
|
|
void *p;
|
|
if(n==0)
|
|
n=1;
|
|
p = malloc(n);
|
|
if(p == nil){
|
|
exits("out of memory");
|
|
}
|
|
memset(p, 0, n);
|
|
return p;
|
|
}
|
|
|
|
static void *
|
|
erealloc(void *ReallocP, int ReallocN)
|
|
{
|
|
if(ReallocN == 0)
|
|
ReallocN = 1;
|
|
if(!ReallocP)
|
|
ReallocP = emalloc(ReallocN);
|
|
else if(!(ReallocP = realloc(ReallocP, ReallocN))){
|
|
exits("out of memory");
|
|
}
|
|
return(ReallocP);
|
|
}
|
|
|
|
static void
|
|
put32(uchar *p, u32int x)
|
|
{
|
|
p[0] = x>>24;
|
|
p[1] = x>>16;
|
|
p[2] = x>>8;
|
|
p[3] = x;
|
|
}
|
|
|
|
static void
|
|
put24(uchar *p, int x)
|
|
{
|
|
p[0] = x>>16;
|
|
p[1] = x>>8;
|
|
p[2] = x;
|
|
}
|
|
|
|
static void
|
|
put16(uchar *p, int x)
|
|
{
|
|
p[0] = x>>8;
|
|
p[1] = x;
|
|
}
|
|
|
|
static u32int
|
|
get32(uchar *p)
|
|
{
|
|
return (p[0]<<24)|(p[1]<<16)|(p[2]<<8)|p[3];
|
|
}
|
|
|
|
static int
|
|
get24(uchar *p)
|
|
{
|
|
return (p[0]<<16)|(p[1]<<8)|p[2];
|
|
}
|
|
|
|
static int
|
|
get16(uchar *p)
|
|
{
|
|
return (p[0]<<8)|p[1];
|
|
}
|
|
|
|
/* ANSI offsetof() */
|
|
#define OFFSET(x, s) ((int)(&(((s*)0)->x)))
|
|
|
|
/*
|
|
* malloc and return a new Bytes structure capable of
|
|
* holding len bytes. (len >= 0)
|
|
* Used to use crypt_malloc, which aborts if malloc fails.
|
|
*/
|
|
static Bytes*
|
|
newbytes(int len)
|
|
{
|
|
Bytes* ans;
|
|
|
|
ans = (Bytes*)malloc(OFFSET(data[0], Bytes) + len);
|
|
ans->len = len;
|
|
return ans;
|
|
}
|
|
|
|
/*
|
|
* newbytes(len), with data initialized from buf
|
|
*/
|
|
static Bytes*
|
|
makebytes(uchar* buf, int len)
|
|
{
|
|
Bytes* ans;
|
|
|
|
ans = newbytes(len);
|
|
memmove(ans->data, buf, len);
|
|
return ans;
|
|
}
|
|
|
|
static void
|
|
freebytes(Bytes* b)
|
|
{
|
|
if(b != nil)
|
|
free(b);
|
|
}
|
|
|
|
/* len is number of ints */
|
|
static Ints*
|
|
newints(int len)
|
|
{
|
|
Ints* ans;
|
|
|
|
ans = (Ints*)malloc(OFFSET(data[0], Ints) + len*sizeof(int));
|
|
ans->len = len;
|
|
return ans;
|
|
}
|
|
|
|
static Ints*
|
|
makeints(int* buf, int len)
|
|
{
|
|
Ints* ans;
|
|
|
|
ans = newints(len);
|
|
if(len > 0)
|
|
memmove(ans->data, buf, len*sizeof(int));
|
|
return ans;
|
|
}
|
|
|
|
static void
|
|
freeints(Ints* b)
|
|
{
|
|
if(b != nil)
|
|
free(b);
|
|
}
|