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NetBSD/usr.bin/passwd/krb5_passwd.c

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/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
/*static char sccsid[] = "from: @(#)krb_passwd.c 5.4 (Berkeley) 3/1/91";*/
static char rcsid[] = "$Id: krb5_passwd.c,v 1.1 1994/07/27 03:28:16 brezak Exp $";
#endif /* not lint */
#ifdef KERBEROS5
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <netinet/in.h>
#include <netdb.h>
#include <signal.h>
#include <pwd.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <krb5/adm_defs.h>
#include <krb5/krb5.h>
#include <krb5/kdb.h>
#include <krb5/kdb_dbm.h>
#include <krb5/ext-proto.h>
#include <krb5/los-proto.h>
#include <krb5/asn1.h>
#include <krb5/config.h>
#include <krb5/base-defs.h>
#include <krb5/asn.1/encode.h>
#include <krb5/widen.h>
#include <krb5/adm_err.h>
#include <krb5/errors.h>
#include <krb5/kdb5_err.h>
#include <krb5/krb5_err.h>
static krb5_error_code get_first_ticket __P((krb5_ccache, krb5_principal));
static krb5_error_code print_and_choose_password __P((char *, krb5_data *));
static krb5_error_code adm5_init_link __P((krb5_data *, int *));
struct sockaddr_in local_sin, remote_sin;
krb5_creds my_creds;
extern char *krb5_default_pwd_prompt1;
/*
* Try no preauthentication first; then try the encrypted timestamp
*/
int preauth_search_list[] = {
0,
KRB5_PADATA_ENC_TIMESTAMP,
-1
};
krb_passwd()
{
static void finish();
krb5_ccache cache = NULL;
char cache_name[255];
krb5_flags cc_flags;
krb5_address local_addr, foreign_addr;
struct passwd *pw;
krb5_principal client, server;
char default_name[256];
char *client_name; /* Single string representation of client id */
krb5_data requested_realm;
char *local_realm;
char input_string[768];
krb5_error_code retval; /* return code */
int local_socket;
int c, count;
krb5_error *err_ret;
krb5_ap_rep_enc_part *rep_ret;
kadmin_requests rd_priv_resp;
krb5_checksum send_cksum;
int cksum_alloc = 0;
krb5_data msg_data, inbuf;
krb5_int32 seqno;
char *new_password;
int new_pwsize;
krb5_data *decodable_pwd_string;
int i, j;
static struct rlimit rl = { 0, 0 };
#ifdef KRB_NONETWORK
extern int networked();
int krb_secure;
struct stat statbuf;
#endif
#ifdef KRB_NONETWORK /* Allow or Disallow Remote Clients to Modify Passwords */
/*
* If a Client Modifies a Password using kpasswd on this host
* from a remote host or network terminal, the Password selected
* is transmitted across the network in Cleartext.
*
* The systems administrator can disallow "remote" kpasswd usage by
* creating the file "/etc/krb.secure"
*/
krb_secure = 0;
/*
* First check to see if the file /etc/krb.secure exists.
* If it does then krb_secure to 1.
*/
if (stat("/etc/krb.secure", &statbuf) == 0) krb_secure = 1;
/*
* Check to see if this process is tied to a physical terminal.
* Network() verifies the terminal device is not a pseudo tty
*/
if (networked() && krb_secure) {
fprintf(stderr,"passwd: Sorry but you cannot %s from a\n", argv[0]);
fprintf(stderr," pseudo tty terminal.\n");
retval = 1;
goto finish;
}
#endif
/* (3 * 255) + 1 (/) + 1 (@) + 1 (NULL) */
if ((client_name = (char *) calloc (1, (3 * 256))) == NULL) {
fprintf(stderr, "passwd: No Memory for Client_name\n");
retval = 1;
goto finish;
}
if ((requested_realm.data = (char *) calloc (1, 256)) == NULL) {
fprintf(stderr, "passwd: No Memory for realm_name\n");
retval = 1;
free(client_name);
goto finish;
}
(void)signal(SIGHUP, SIG_IGN);
(void)signal(SIGINT, SIG_IGN);
(void)signal(SIGTSTP, SIG_IGN);
if (setrlimit(RLIMIT_CORE, &rl) < 0) {
(void)fprintf(stderr,
"passwd: setrlimit: %s\n", strerror(errno));
return(1);
}
krb5_init_ets();
memset((char *) default_name, 0, sizeof(default_name));
/* Identify Default Credentials Cache */
if ((retval = krb5_cc_default(&cache))) {
fprintf(stderr, "passwd: Error while getting default ccache.\n");
goto finish;
}
/*
* Attempt to Modify Credentials Cache
* retval == 0 ==> ccache Exists - Use It
* retval == ENOENT ==> No Entries, but ccache Exists
* retval != 0 ==> Assume ccache does NOT Exist
*/
cc_flags = 0;
if ((retval = krb5_cc_set_flags(cache, cc_flags))) {
/* Search passwd file for client */
pw = getpwuid((int) getuid());
if (pw) {
(void) strcpy(default_name, pw->pw_name);
}
else {
fprintf(stderr,
"passwd: Unable to Identify Customer from Password File\n");
retval = 1;
goto finish;
}
/* Use this to get default_realm and format client_name */
if ((retval = krb5_parse_name(default_name, &client))) {
fprintf(stderr, "passwd: Unable to Parse Client Name\n");
goto finish;
}
if ((retval = krb5_unparse_name(client, &client_name))) {
fprintf(stderr, "passwd: Unable to Parse Client Name\n");
goto finish;
}
requested_realm.length = client->realm.length;
memcpy((char *) requested_realm.data,
(char *) client->realm.data,
requested_realm.length);
}
else {
/* Read Client from Cache */
if ((retval = krb5_cc_get_principal(cache, (krb5_principal *) &client))) {
fprintf(stderr, "passwd: Unable to Read Customer Credentials File\n");
goto finish;
}
if ((retval = krb5_unparse_name(client, &client_name))) {
fprintf(stderr, "passwd: Unable to Parse Client Name\n");
goto finish;
}
requested_realm.length = client->realm.length;
memcpy((char *) requested_realm.data,
(char *) client->realm.data,
requested_realm.length);
(void) krb5_cc_close(cache);
}
/* Create credential cache for changepw */
(void) sprintf(cache_name, "FILE:/tmp/tkt_cpw_%d", getpid());
if ((retval = krb5_cc_resolve(cache_name, &cache))) {
fprintf(stderr, "passwd: Unable to Resolve Cache: %s\n", cache_name);
}
if ((retval = krb5_cc_initialize(cache, client))) {
fprintf(stderr, "passwd: Error initializing cache: %s\n", cache_name);
goto finish;
}
/*
* Verify User by Obtaining Initial Credentials prior to Initial Link
*/
if ((retval = get_first_ticket(cache, client))) {
goto finish;
}
/* Initiate Link to Server */
if ((retval = adm5_init_link(&requested_realm, &local_socket))) {
goto finish;
}
#define SIZEOF_INADDR sizeof(struct in_addr)
/* V4 kpasswd Protocol Hack */
{
int msg_length = 0;
retval = krb5_net_write(local_socket, (char *) &msg_length + 2, 2);
if (retval < 0) {
fprintf(stderr, "passwd: krb5_net_write failure\n");
goto finish;
}
}
local_addr.addrtype = ADDRTYPE_INET;
local_addr.length = SIZEOF_INADDR ;
local_addr.contents = (krb5_octet *)&local_sin.sin_addr;
foreign_addr.addrtype = ADDRTYPE_INET;
foreign_addr.length = SIZEOF_INADDR ;
foreign_addr.contents = (krb5_octet *)&remote_sin.sin_addr;
/* compute checksum, using CRC-32 */
if (!(send_cksum.contents = (krb5_octet *)
malloc(krb5_checksum_size(CKSUMTYPE_CRC32)))) {
fprintf(stderr, "passwd: Insufficient Memory while Allocating Checksum\n");
goto finish;
}
cksum_alloc++;
/* choose some random stuff to compute checksum from */
if (retval = krb5_calculate_checksum(CKSUMTYPE_CRC32,
ADM_CPW_VERSION,
strlen(ADM_CPW_VERSION),
0,
0, /* if length is 0, crc-32 doesn't
use the seed */
&send_cksum)) {
fprintf(stderr, "Error while Computing Checksum: %s\n",
error_message(retval));
goto finish;
}
/* call Kerberos library routine to obtain an authenticator,
pass it over the socket to the server, and obtain mutual
authentication. */
if ((retval = krb5_sendauth((krb5_pointer) &local_socket,
ADM_CPW_VERSION,
my_creds.client,
my_creds.server,
AP_OPTS_MUTUAL_REQUIRED,
&send_cksum,
0,
cache,
&seqno,
0, /* don't need a subsession key */
&err_ret,
&rep_ret))) {
fprintf(stderr, "passwd: Error while performing sendauth: %s\n",
error_message(retval));
goto finish;
}
/* Get credentials : to use for safe and private messages */
if (retval = krb5_get_credentials(0, cache, &my_creds)){
fprintf(stderr, "passwd: Error Obtaining Credentials: %s\n",
error_message(retval));
goto finish;
}
/* Read back what the server has to say... */
if (retval = krb5_read_message(&local_socket, &inbuf)){
fprintf(stderr, "passwd: Read Message Error: %s\n",
error_message(retval));
goto finish;
}
if ((inbuf.length != 2) || (inbuf.data[0] != KADMIND) ||
(inbuf.data[1] != KADMSAG)){
fprintf(stderr, "passwd: Invalid ack from admin server.\n");
goto finish;
}
inbuf.data[0] = KPASSWD;
inbuf.data[1] = CHGOPER;
inbuf.length = 2;
if ((retval = krb5_mk_priv(&inbuf,
ETYPE_DES_CBC_CRC,
&my_creds.keyblock,
&local_addr,
&foreign_addr,
seqno,
KRB5_PRIV_DOSEQUENCE|KRB5_PRIV_NOTIME,
0,
0,
&msg_data))) {
fprintf(stderr, "passwd: Error during First Message Encoding: %s\n",
error_message(retval));
goto finish;
}
free(inbuf.data);
/* write private message to server */
if (krb5_write_message(&local_socket, &msg_data)){
fprintf(stderr, "passwd: Write Error During First Message Transmission\n");
retval = 1;
goto finish;
}
free(msg_data.data);
(void)signal(SIGHUP, finish);
(void)signal(SIGINT, finish);
#ifdef MACH_PASS /* Machine-generated Passwords */
/* Ok Now let's get the private message */
if (retval = krb5_read_message(&local_socket, &inbuf)){
fprintf(stderr, "passwd: Read Error During First Reply: %s\n",
error_message(retval));
retval = 1;
goto finish;
}
if ((retval = krb5_rd_priv(&inbuf,
&my_creds.keyblock,
&foreign_addr,
&local_addr,
rep_ret->seq_number,
KRB5_PRIV_DOSEQUENCE|KRB5_PRIV_NOTIME,
0,
0,
&msg_data))) {
fprintf(stderr, "passwd: Error during First Read Decoding: %s\n",
error_message(retval));
goto finish;
}
free(inbuf.data);
#endif
if ((new_password = (char *) calloc (1, ADM_MAX_PW_LENGTH+1)) == NULL) {
fprintf(stderr, "passwd: Unable to Allocate Space for New Password\n");
goto finish;
}
#ifdef MACH_PASS /* Machine-generated passwords */
/* Offer Client Password Choices */
if ((retval = print_and_choose_password(new_password,
&msg_data))) {
(void) memset((char *) new_password, 0, ADM_MAX_PW_LENGTH+1);
free(new_password);
goto finish;
}
#else
new_pwsize = ADM_MAX_PW_LENGTH+1;
if ((retval = krb5_read_password("New Kerberos password: ",
"Retype new Kerberos password: ",
new_password,
&new_pwsize))) {
fprintf(stderr, "\nError while reading new password for '%s'\n",
client_name);
(void) memset((char *) new_password, 0, ADM_MAX_PW_LENGTH+1);
free(new_password);
goto finish;
}
#endif
inbuf.data = new_password;
inbuf.length = strlen(new_password);
if ((retval = krb5_mk_priv(&inbuf,
ETYPE_DES_CBC_CRC,
&my_creds.keyblock,
&local_addr,
&foreign_addr,
seqno,
KRB5_PRIV_DOSEQUENCE|KRB5_PRIV_NOTIME,
0,
0,
&msg_data))) {
fprintf(stderr, "passwd: Error during Second Message Encoding: %s\n",
error_message(retval));
goto finish;
}
memset(inbuf.data,0,inbuf.length);
free(inbuf.data);
/* write private message to server */
if (krb5_write_message(&local_socket, &msg_data)){
fprintf(stderr, "passwd: Write Error During Second Message Transmission\n");
retval = 1;
goto finish;
}
free(msg_data.data);
/* Ok Now let's get the private message */
if (retval = krb5_read_message(&local_socket, &inbuf)){
fprintf(stderr, "passwd: Read Error During Second Reply: %s\n",
error_message(retval));
retval = 1;
goto finish;
}
if ((retval = krb5_rd_priv(&inbuf,
&my_creds.keyblock,
&foreign_addr,
&local_addr,
rep_ret->seq_number,
KRB5_PRIV_DOSEQUENCE|KRB5_PRIV_NOTIME,
0,
0,
&msg_data))) {
fprintf(stderr, "passwd: Error during Second Read Decoding :%s\n",
error_message(retval));
goto finish;
}
rd_priv_resp.appl_code = msg_data.data[0];
rd_priv_resp.oper_code = msg_data.data[1];
rd_priv_resp.retn_code = msg_data.data[2];
if (msg_data.length > 3 && msg_data.data[3]) {
rd_priv_resp.message = malloc(msg_data.length - 2);
if (rd_priv_resp.message) {
memcpy(rd_priv_resp.message, msg_data.data + 3,
msg_data.length - 3);
rd_priv_resp.message[msg_data.length - 3] = 0;
}
} else
rd_priv_resp.message = NULL;
free(inbuf.data);
free(msg_data.data);
if (rd_priv_resp.appl_code == KPASSWD) {
if (rd_priv_resp.retn_code == KPASSBAD) {
if (rd_priv_resp.message)
fprintf(stderr, "passwd: %s\n", rd_priv_resp.message);
else
fprintf(stderr, "passwd: Server returned KPASSBAD.\n");
} else if (rd_priv_resp.retn_code != KPASSGOOD)
fprintf(stderr, "passwd: Server returned unknown kerberos code.\n");
} else
fprintf(stderr, "passwd: Server returned bad application code %d\n",
rd_priv_resp.appl_code);
if (rd_priv_resp.message)
free(rd_priv_resp.message);
finish:
(void) krb5_cc_destroy(cache);
free(client_name);
free(requested_realm.data);
if (cksum_alloc) free(send_cksum.contents);
if (retval) {
fprintf(stderr, "passwd: Protocol Failure - Password NOT changed\n");
exit(1);
}
exit(0);
}
krb5_data cpwname = {
sizeof(CPWNAME)-1,
CPWNAME
};
static krb5_error_code
get_first_ticket(cache, client)
krb5_ccache cache;
krb5_principal client;
{
char prompt[255]; /* for the password prompt */
char verify_prompt[255]; /* Verification Prompt if Desired */
char pword[ADM_MAX_PW_LENGTH+1]; /* storage for the password */
int pword_length = sizeof(pword);
char *old_password;
int old_pwsize;
int i;
krb5_address **my_addresses;
char *client_name;
char local_realm[255];
krb5_error_code retval;
if ((retval = krb5_unparse_name(client, &client_name))) {
fprintf(stderr, "Unable to Unparse Client Name\n");
return(1);
}
(void) printf("Changing Kerberos password for %s\n", client_name);
if ((retval = krb5_os_localaddr(&my_addresses))) {
fprintf(stderr, "passwd: Unable to Get Customers Address\n");
return(1);
}
memset((char *) &my_creds, 0, sizeof(my_creds));
my_creds.client = client;
if ((retval = krb5_build_principal_ext(&my_creds.server,
client->realm.length,
client->realm.data,
cpwname.length, /* 6 */
cpwname.data, /* "kadmin" */
client->realm.length,
/* instance is local realm */
client->realm.data,
0))) {
fprintf(stderr, "Error %s while building server name\n");
return(1);
}
if ((old_password = (char *) calloc (1, 255)) == NULL) {
fprintf(stderr, "passwd: No Memory for Retrieving old password\n");
return(1);
}
old_pwsize = 255;
if ((retval = krb5_read_password("Old kerberos password: ",
0,
old_password,
&old_pwsize))) {
fprintf(stderr, "\nError while reading password for '%s'\n",
client_name);
return(1);
}
/* Build Request for Initial Credentials */
for (i=0; preauth_search_list[i] >= 0; i++) {
retval = krb5_get_in_tkt_with_password(
0, /* options */
my_addresses,
/* do random preauth */
preauth_search_list[i],
ETYPE_DES_CBC_CRC, /* etype */
KEYTYPE_DES,
old_password,
cache,
&my_creds,
0);
if (retval != KRB5KDC_PREAUTH_FAILED &&
retval != KRB5KRB_ERR_GENERIC)
break;
}
if (retval) {
fprintf(stderr, "passwd: Unable to Get Initial Credentials : %s\n",
error_message(retval));
}
/* Do NOT Forget to zap password */
memset((char *) old_password, 0, old_pwsize);
free(old_password);
memset((char *) pword, 0, sizeof(pword));
return(retval);
}
#ifdef MACH_PASS /* Machine-generated Passwords */
static krb5_error_code
print_and_choose_password(new_password, decodable_pwd_string)
char * new_password;
krb5_data *decodable_pwd_string;
{
krb5_error_code retval;
krb5_pwd_data *pwd_data;
passwd_phrase_element **next_passwd_phrase_element;
char prompt[255];
char *verify_prompt = 0;
int i, j, k;
int legit_pswd = 0; /* Assume No Legitimate Password */
char *password_list[ADM_MAX_PW_CHOICES];
char verification_passwd[ADM_MAX_PW_LENGTH+1];
char phrase_in[ADM_MAX_PHRASE_LENGTH];
int new_passwd_length;
char *ptr;
int verify = 0; /* Do Not Request Password Selection Verification */
int ok = 0;
#define free_local_password_list() \
{ for ( k = 0; k < i && k < ADM_MAX_PW_CHOICES; k++) { \
(void) memset(password_list[k], 0, ADM_MAX_PW_LENGTH); \
free(password_list[k]); } \
}
/* Decode Password and Phrase Information Obtained from krb5_rd_priv */
if ((retval = decode_krb5_pwd_data(decodable_pwd_string , &pwd_data))) {
fprintf(stderr, "passwd: Unable to Decode Passwords and Phrases\n");
fprintf(stderr, " Notify your System Administrator or the Kerberos Administrator\n");
return(1);
}
next_passwd_phrase_element = pwd_data->element;
/* Display List in 5 Password/Phrase Increments up to MAX Iterations */
memset((char *) phrase_in, 0, ADM_MAX_PHRASE_LENGTH);
for ( j = 0; j <= ADM_MAX_PW_ITERATIONS; j++) {
if (j == ADM_MAX_PW_ITERATIONS) {
fprintf(stderr, "passwd: Sorry - You Have Exceeded the List of Choices (%d) Allowed for Password\n",
ADM_MAX_PW_ITERATIONS * ADM_MAX_PW_CHOICES);
fprintf(stderr, " Modification. You Must Repeat this Operation in order to Successfully\n");
fprintf(stderr, " Change your Password.\n");
break;
}
display_print:
printf("Choose a password from the following list:\n");
printf("\nPassword Remembrance Aid\n");
/* Print Passwords and Assistance Phrases List */
for ( i = 0; i < ADM_MAX_PW_CHOICES; i++){
if ((password_list[i] = (char *) calloc (1,
ADM_MAX_PW_LENGTH + 1)) == NULL) {
fprintf(stderr, "passwd: Unable to Allocate Password List.\n");
return(1);
}
memcpy(password_list[i],
(*next_passwd_phrase_element)->passwd->data,
(*next_passwd_phrase_element)->passwd->length);
printf("%s ", password_list[i]);
memcpy((char *) phrase_in,
(*next_passwd_phrase_element)->phrase->data,
(*next_passwd_phrase_element)->phrase->length);
for ( k = 0;
k < 50 && k < (*next_passwd_phrase_element)->phrase->length;
k++) {
printf("%c", phrase_in[k]);
}
for ( k = k;
k < 70 && k < (*next_passwd_phrase_element)->phrase->length;
k++) {
if (phrase_in[k] == ' ') {
printf("\n ");
k++;
break;
} else {
printf("%c", phrase_in[k]);
}
}
for ( k = k;
k < (*next_passwd_phrase_element)->phrase->length;
k++) {
printf("%c", phrase_in[k]);
}
printf("\n");
memset((char *) phrase_in, 0, ADM_MAX_PHRASE_LENGTH);
next_passwd_phrase_element++;
}
sprintf(prompt,
"\nEnter Password Selection or a <CR> to get new list: ");
new_passwd_length = ADM_MAX_PW_LENGTH+1;
/* Read New Password from Terminal (Do Not Print on Screen) */
if ((retval = krb5_read_password(&prompt[0], 0,
new_password, &new_passwd_length))) {
fprintf(stderr,
"passwd: Error Reading Password Input or Input Aborted\n");
free_local_password_list();
break;;
}
/* Check for <CR> ==> Provide a New List */
if (new_passwd_length == 0) continue;
/* Check that Selection is from List - Server also does this */
legit_pswd = 0;
for (i = 0; i < ADM_MAX_PW_CHOICES && !legit_pswd; i++)
if ((retval = memcmp(new_password,
password_list[i], 8)) == 0) {
legit_pswd++;
}
free_local_password_list();
if (!(legit_pswd)) {
printf("\07\07Password must be from the specified list ");
printf("- Try Again\n");
}
if (legit_pswd) break; /* Exit Loop */
} /* ADM_MAX_PW_CHOICES Loop */
if (!(legit_pswd)) return (1);
return(0); /* SUCCESS */
}
#endif
static krb5_error_code
adm5_init_link(realm_of_server, local_socket)
krb5_data *realm_of_server;
int * local_socket;
{
struct servent *service_process; /* service we will talk to */
struct hostent *local_host; /* us */
struct hostent *remote_host; /* host we will talk to */
struct sockaddr *sockaddr_list;
char **hostlist;
int host_count;
int namelen;
int i, count;
krb5_error_code retval;
/* clear out the structure first */
(void) memset((char *)&remote_sin, 0, sizeof(remote_sin));
if ((service_process = getservbyname(CPW_SNAME, "tcp")) == NULL) {
fprintf(stderr, "passwd: Unable to find Service (%s) Check services file\n",
CPW_SNAME);
return(1);
}
/* Copy the Port Number */
remote_sin.sin_port = service_process->s_port;
hostlist = 0;
/* Identify all Hosts Associated with this Realm */
if ((retval = krb5_get_krbhst (realm_of_server, &hostlist))) {
fprintf(stderr, "passwd: Unable to Determine Server Name\n");
return(1);
}
for (i=0; hostlist[i]; i++);
count = i;
if (count == 0) {
host_count = 0;
fprintf(stderr, "passwd: No hosts found\n");
return(1);
}
for (i=0; hostlist[i]; i++) {
remote_host = gethostbyname(hostlist[i]);
if (remote_host != 0) {
/* set up the address of the foreign socket for connect() */
remote_sin.sin_family = remote_host->h_addrtype;
(void) memcpy((char *) &remote_sin.sin_addr,
(char *) remote_host->h_addr,
sizeof(remote_host->h_addr));
break; /* Only Need one */
}
}
free ((char *)hostlist);
/* open a TCP socket */
*local_socket = socket(PF_INET, SOCK_STREAM, 0);
if (*local_socket < 0) {
fprintf(stderr, "passwd: Cannot Open Socket\n");
return(1);
}
/* connect to the server */
if (connect(*local_socket, (struct sockaddr *)&remote_sin, sizeof(remote_sin)) < 0) {
fprintf(stderr, "passwd: Cannot Connect to Socket\n");
close(*local_socket);
return(1);
}
/* find out who I am, now that we are connected and therefore bound */
namelen = sizeof(local_sin);
if (getsockname(*local_socket,
(struct sockaddr *) &local_sin, &namelen) < 0) {
fprintf(stderr, "passwd: Cannot Perform getsockname\n");
close(*local_socket);
return(1);
}
return(0);
}
static void
finish()
{
exit(1);
}
#ifdef KRB_NONETWORK
#include <utmp.h>
#ifndef MAXHOSTNAME
#define MAXHOSTNAME 64
#endif
int utfile; /* Global utfile file descriptor for BSD version
of setutent, getutline, and endutent */
#if !defined(SYSV) && !defined(UMIPS) /* Setutent, Endutent, and getutline
routines for non System V Unix
systems */
#include <fcntl.h>
void setutent()
{
utfile = open("/etc/utmp",O_RDONLY);
}
struct utmp * getutline(utmpent)
struct utmp *utmpent;
{
static struct utmp tmputmpent;
int found = 0;
while ( read(utfile,&tmputmpent,sizeof(struct utmp)) > 0 ){
if ( strcmp(tmputmpent.ut_line,utmpent->ut_line) == 0){
#ifdef NO_UT_HOST
if ( ( 1) &&
#else
if ( (strcmp(tmputmpent.ut_host,"") == 0) &&
#endif
(strcmp(tmputmpent.ut_name,"") == 0)) continue;
found = 1;
break;
}
}
if (found)
return(&tmputmpent);
return((struct utmp *) 0);
}
void endutent()
{
close(utfile);
}
#endif /* not SYSV */
int network_connected()
{
struct utmp utmpent;
struct utmp retutent, *tmpptr;
char *display_indx;
char currenthost[MAXHOSTNAME];
char *username,*tmpname;
/* Macro for pseudo_tty */
#define pseudo_tty(ut) \
((strncmp((ut).ut_line, "tty", 3) == 0 && ((ut).ut_line[3] == 'p' \
|| (ut).ut_line[3] == 'q' \
|| (ut).ut_line[3] == 'r' \
|| (ut).ut_line[3] == 's'))\
|| (strncmp((ut).ut_line, "pty", 3) == 0))
/* Check to see if getlogin returns proper name */
if ( (tmpname = (char *) getlogin()) == (char *) 0) return(1);
username = (char *) malloc(strlen(tmpname) + 1);
if ( username == (char *) 0) return(1);
strcpy(username,tmpname);
/* Obtain tty device for controlling tty of current process.*/
strncpy(utmpent.ut_line,ttyname(0) + strlen("/dev/"),
sizeof(utmpent.ut_line));
/* See if this device is currently listed in /etc/utmp under
calling user */
#ifdef SYSV
utmpent.ut_type = USER_PROCESS;
#define ut_name ut_user
#endif
setutent();
while ( (tmpptr = (struct utmp *) getutline(&utmpent))
!= ( struct utmp *) 0) {
/* If logged out name and host will be empty */
if ((strcmp(tmpptr->ut_name,"") == 0) &&
#ifdef NO_UT_HOST
( 1)) continue;
#else
(strcmp(tmpptr->ut_host,"") == 0)) continue;
#endif
else break;
}
if ( tmpptr == (struct utmp *) 0) {
endutent();
return(1);
}
bcopy((char *)&retutent, (char *)tmpptr, sizeof(struct utmp));
endutent();
#ifdef DEBUG
#ifdef NO_UT_HOST
printf("User %s on line %s :\n",
retutent.ut_name,retutent.ut_line);
#else
printf("User %s on line %s connected from host :%s:\n",
retutent.ut_name,retutent.ut_line,retutent.ut_host);
#endif
#endif
if (strcmp(retutent.ut_name,username) != 0) {
return(1);
}
/* If this is not a pseudo tty then everything is OK */
if (! pseudo_tty(retutent)) return(0);
/* OK now the work begins there is an entry in utmp and
the device is a pseudo tty. */
/* Check if : is in hostname if so this is xwindow display */
if (gethostname(currenthost,sizeof(currenthost))) return(1);
#ifdef NO_UT_HOST
display_indx = (char *) 0;
#else
display_indx = (char *) strchr(retutent.ut_host,':');
#endif
if ( display_indx != (char *) 0) {
/*
We have X window application here. The host field should have
the form => local_system_name:0.0 or :0.0
if the window is being displayed on the local system.
*/
#ifdef NO_UT_HOST
return(1);
#else
if (strncmp(currenthost,retutent.ut_host,
(display_indx - retutent.ut_host)) != 0) return(1);
else return(0);
#endif
}
/* Host field is empty or is not X window entry. At this point
we can't trust that the pseudo tty is not connected to a
networked process so let's return 1.
*/
return(1);
}
int networked()
{
return(network_connected());
}
#endif
#endif /* KERBEROS5 */
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