629 lines
16 KiB
C
629 lines
16 KiB
C
/* $OpenBSD: ssh-pkcs11-client.c,v 1.19 2023/12/18 14:46:56 djm Exp $ */
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/*
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* Copyright (c) 2010 Markus Friedl. All rights reserved.
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* Copyright (c) 2014 Pedro Martelletto. All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <stdarg.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <limits.h>
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#include <openssl/ecdsa.h>
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#include <openssl/rsa.h>
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#include "pathnames.h"
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#include "xmalloc.h"
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#include "sshbuf.h"
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#include "log.h"
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#include "misc.h"
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#include "sshkey.h"
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#include "authfd.h"
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#include "atomicio.h"
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#include "ssh-pkcs11.h"
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#include "ssherr.h"
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/* borrows code from sftp-server and ssh-agent */
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/*
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* Maintain a list of ssh-pkcs11-helper subprocesses. These may be looked up
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* by provider path or their unique EC/RSA METHOD pointers.
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*/
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struct helper {
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char *path;
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pid_t pid;
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int fd;
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RSA_METHOD *rsa_meth;
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EC_KEY_METHOD *ec_meth;
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int (*rsa_finish)(RSA *rsa);
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void (*ec_finish)(EC_KEY *key);
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size_t nrsa, nec; /* number of active keys of each type */
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};
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static struct helper **helpers;
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static size_t nhelpers;
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static struct helper *
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helper_by_provider(const char *path)
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{
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size_t i;
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for (i = 0; i < nhelpers; i++) {
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if (helpers[i] == NULL || helpers[i]->path == NULL ||
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helpers[i]->fd == -1)
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continue;
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if (strcmp(helpers[i]->path, path) == 0)
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return helpers[i];
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}
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return NULL;
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}
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static struct helper *
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helper_by_rsa(const RSA *rsa)
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{
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size_t i;
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const RSA_METHOD *meth;
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if ((meth = RSA_get_method(rsa)) == NULL)
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return NULL;
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for (i = 0; i < nhelpers; i++) {
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if (helpers[i] != NULL && helpers[i]->rsa_meth == meth)
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return helpers[i];
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}
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return NULL;
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}
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static struct helper *
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helper_by_ec(const EC_KEY *ec)
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{
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size_t i;
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const EC_KEY_METHOD *meth;
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if ((meth = EC_KEY_get_method(ec)) == NULL)
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return NULL;
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for (i = 0; i < nhelpers; i++) {
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if (helpers[i] != NULL && helpers[i]->ec_meth == meth)
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return helpers[i];
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}
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return NULL;
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}
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static void
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helper_free(struct helper *helper)
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{
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size_t i;
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int found = 0;
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if (helper == NULL)
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return;
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if (helper->path == NULL || helper->ec_meth == NULL ||
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helper->rsa_meth == NULL)
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fatal_f("inconsistent helper");
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debug3_f("free helper for provider %s", helper->path);
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for (i = 0; i < nhelpers; i++) {
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if (helpers[i] == helper) {
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if (found)
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fatal_f("helper recorded more than once");
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found = 1;
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}
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else if (found)
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helpers[i - 1] = helpers[i];
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}
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if (found) {
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helpers = xrecallocarray(helpers, nhelpers,
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nhelpers - 1, sizeof(*helpers));
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nhelpers--;
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}
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free(helper->path);
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EC_KEY_METHOD_free(helper->ec_meth);
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RSA_meth_free(helper->rsa_meth);
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free(helper);
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}
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static void
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helper_terminate(struct helper *helper)
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{
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if (helper == NULL) {
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return;
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} else if (helper->fd == -1) {
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debug3_f("already terminated");
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} else {
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debug3_f("terminating helper for %s; "
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"remaining %zu RSA %zu ECDSA",
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helper->path, helper->nrsa, helper->nec);
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close(helper->fd);
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/* XXX waitpid() */
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helper->fd = -1;
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helper->pid = -1;
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}
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/*
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* Don't delete the helper entry until there are no remaining keys
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* that reference it. Otherwise, any signing operation would call
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* a free'd METHOD pointer and that would be bad.
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*/
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if (helper->nrsa == 0 && helper->nec == 0)
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helper_free(helper);
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}
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static void
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send_msg(int fd, struct sshbuf *m)
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{
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u_char buf[4];
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size_t mlen = sshbuf_len(m);
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int r;
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if (fd == -1)
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return;
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POKE_U32(buf, mlen);
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if (atomicio(vwrite, fd, buf, 4) != 4 ||
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atomicio(vwrite, fd, sshbuf_mutable_ptr(m),
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sshbuf_len(m)) != sshbuf_len(m))
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error("write to helper failed");
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if ((r = sshbuf_consume(m, mlen)) != 0)
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fatal_fr(r, "consume");
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}
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static int
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recv_msg(int fd, struct sshbuf *m)
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{
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u_int l, len;
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u_char c, buf[1024];
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int r;
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sshbuf_reset(m);
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if (fd == -1)
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return 0; /* XXX */
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if ((len = atomicio(read, fd, buf, 4)) != 4) {
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error("read from helper failed: %u", len);
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return (0); /* XXX */
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}
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len = PEEK_U32(buf);
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if (len > 256 * 1024)
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fatal("response too long: %u", len);
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/* read len bytes into m */
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while (len > 0) {
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l = len;
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if (l > sizeof(buf))
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l = sizeof(buf);
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if (atomicio(read, fd, buf, l) != l) {
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error("response from helper failed.");
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return (0); /* XXX */
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}
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if ((r = sshbuf_put(m, buf, l)) != 0)
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fatal_fr(r, "sshbuf_put");
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len -= l;
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}
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if ((r = sshbuf_get_u8(m, &c)) != 0)
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fatal_fr(r, "parse type");
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return c;
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}
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int
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pkcs11_init(int interactive)
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{
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return 0;
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}
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void
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pkcs11_terminate(void)
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{
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size_t i;
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debug3_f("terminating %zu helpers", nhelpers);
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for (i = 0; i < nhelpers; i++)
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helper_terminate(helpers[i]);
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}
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static int
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rsa_encrypt(int flen, const u_char *from, u_char *to, RSA *rsa, int padding)
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{
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struct sshkey *key = NULL;
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struct sshbuf *msg = NULL;
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u_char *blob = NULL, *signature = NULL;
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size_t blen, slen = 0;
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int r, ret = -1;
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struct helper *helper;
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if ((helper = helper_by_rsa(rsa)) == NULL || helper->fd == -1)
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fatal_f("no helper for PKCS11 key");
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debug3_f("signing with PKCS11 provider %s", helper->path);
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if (padding != RSA_PKCS1_PADDING)
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goto fail;
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key = sshkey_new(KEY_UNSPEC);
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if (key == NULL) {
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error_f("sshkey_new failed");
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goto fail;
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}
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key->type = KEY_RSA;
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RSA_up_ref(rsa);
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key->rsa = rsa;
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if ((r = sshkey_to_blob(key, &blob, &blen)) != 0) {
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error_fr(r, "encode key");
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goto fail;
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}
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if ((msg = sshbuf_new()) == NULL)
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fatal_f("sshbuf_new failed");
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if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_SIGN_REQUEST)) != 0 ||
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(r = sshbuf_put_string(msg, blob, blen)) != 0 ||
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(r = sshbuf_put_string(msg, from, flen)) != 0 ||
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(r = sshbuf_put_u32(msg, 0)) != 0)
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fatal_fr(r, "compose");
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send_msg(helper->fd, msg);
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sshbuf_reset(msg);
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if (recv_msg(helper->fd, msg) == SSH2_AGENT_SIGN_RESPONSE) {
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if ((r = sshbuf_get_string(msg, &signature, &slen)) != 0)
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fatal_fr(r, "parse");
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if (slen <= (size_t)RSA_size(rsa)) {
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memcpy(to, signature, slen);
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ret = slen;
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}
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free(signature);
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}
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fail:
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free(blob);
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sshkey_free(key);
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sshbuf_free(msg);
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return (ret);
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}
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static int
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rsa_finish(RSA *rsa)
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{
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struct helper *helper;
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if ((helper = helper_by_rsa(rsa)) == NULL)
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fatal_f("no helper for PKCS11 key");
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debug3_f("free PKCS11 RSA key for provider %s", helper->path);
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if (helper->rsa_finish != NULL)
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helper->rsa_finish(rsa);
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if (helper->nrsa == 0)
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fatal_f("RSA refcount error");
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helper->nrsa--;
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debug3_f("provider %s remaining keys: %zu RSA %zu ECDSA",
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helper->path, helper->nrsa, helper->nec);
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if (helper->nrsa == 0 && helper->nec == 0)
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helper_terminate(helper);
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return 1;
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}
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static ECDSA_SIG *
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ecdsa_do_sign(const unsigned char *dgst, int dgst_len, const BIGNUM *inv,
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const BIGNUM *rp, EC_KEY *ec)
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{
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struct sshkey *key = NULL;
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struct sshbuf *msg = NULL;
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ECDSA_SIG *ret = NULL;
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const u_char *cp;
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u_char *blob = NULL, *signature = NULL;
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size_t blen, slen = 0;
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int r, nid;
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struct helper *helper;
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if ((helper = helper_by_ec(ec)) == NULL || helper->fd == -1)
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fatal_f("no helper for PKCS11 key");
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debug3_f("signing with PKCS11 provider %s", helper->path);
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nid = sshkey_ecdsa_key_to_nid(ec);
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if (nid < 0) {
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error_f("couldn't get curve nid");
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goto fail;
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}
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key = sshkey_new(KEY_UNSPEC);
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if (key == NULL) {
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error_f("sshkey_new failed");
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goto fail;
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}
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key->ecdsa = ec;
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key->ecdsa_nid = nid;
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key->type = KEY_ECDSA;
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EC_KEY_up_ref(ec);
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if ((r = sshkey_to_blob(key, &blob, &blen)) != 0) {
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error_fr(r, "encode key");
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goto fail;
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}
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if ((msg = sshbuf_new()) == NULL)
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fatal_f("sshbuf_new failed");
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if ((r = sshbuf_put_u8(msg, SSH2_AGENTC_SIGN_REQUEST)) != 0 ||
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(r = sshbuf_put_string(msg, blob, blen)) != 0 ||
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(r = sshbuf_put_string(msg, dgst, dgst_len)) != 0 ||
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(r = sshbuf_put_u32(msg, 0)) != 0)
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fatal_fr(r, "compose");
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send_msg(helper->fd, msg);
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sshbuf_reset(msg);
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if (recv_msg(helper->fd, msg) == SSH2_AGENT_SIGN_RESPONSE) {
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if ((r = sshbuf_get_string(msg, &signature, &slen)) != 0)
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fatal_fr(r, "parse");
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cp = signature;
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ret = d2i_ECDSA_SIG(NULL, &cp, slen);
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free(signature);
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}
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fail:
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free(blob);
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sshkey_free(key);
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sshbuf_free(msg);
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return (ret);
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}
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static void
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ecdsa_do_finish(EC_KEY *ec)
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{
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struct helper *helper;
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if ((helper = helper_by_ec(ec)) == NULL)
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fatal_f("no helper for PKCS11 key");
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debug3_f("free PKCS11 ECDSA key for provider %s", helper->path);
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if (helper->ec_finish != NULL)
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helper->ec_finish(ec);
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if (helper->nec == 0)
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fatal_f("ECDSA refcount error");
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helper->nec--;
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debug3_f("provider %s remaining keys: %zu RSA %zu ECDSA",
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helper->path, helper->nrsa, helper->nec);
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if (helper->nrsa == 0 && helper->nec == 0)
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helper_terminate(helper);
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}
|
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|
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/* redirect private key crypto operations to the ssh-pkcs11-helper */
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static void
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wrap_key(struct helper *helper, struct sshkey *k)
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{
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debug3_f("wrap %s for provider %s", sshkey_type(k), helper->path);
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if (k->type == KEY_RSA) {
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RSA_set_method(k->rsa, helper->rsa_meth);
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if (helper->nrsa++ >= INT_MAX)
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fatal_f("RSA refcount error");
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} else if (k->type == KEY_ECDSA) {
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EC_KEY_set_method(k->ecdsa, helper->ec_meth);
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if (helper->nec++ >= INT_MAX)
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fatal_f("EC refcount error");
|
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} else
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fatal_f("unknown key type");
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k->flags |= SSHKEY_FLAG_EXT;
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debug3_f("provider %s remaining keys: %zu RSA %zu ECDSA",
|
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helper->path, helper->nrsa, helper->nec);
|
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}
|
|
|
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/*
|
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* Make a private PKCS#11-backed certificate by grafting a previously-loaded
|
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* PKCS#11 private key and a public certificate key.
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*/
|
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int
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pkcs11_make_cert(const struct sshkey *priv,
|
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const struct sshkey *certpub, struct sshkey **certprivp)
|
|
{
|
|
struct helper *helper = NULL;
|
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struct sshkey *ret;
|
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int r;
|
|
|
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debug3_f("private key type %s cert type %s", sshkey_type(priv),
|
|
sshkey_type(certpub));
|
|
*certprivp = NULL;
|
|
if (!sshkey_is_cert(certpub) || sshkey_is_cert(priv) ||
|
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!sshkey_equal_public(priv, certpub)) {
|
|
error_f("private key %s doesn't match cert %s",
|
|
sshkey_type(priv), sshkey_type(certpub));
|
|
return SSH_ERR_INVALID_ARGUMENT;
|
|
}
|
|
*certprivp = NULL;
|
|
if (priv->type == KEY_RSA) {
|
|
if ((helper = helper_by_rsa(priv->rsa)) == NULL ||
|
|
helper->fd == -1)
|
|
fatal_f("no helper for PKCS11 RSA key");
|
|
if ((r = sshkey_from_private(priv, &ret)) != 0)
|
|
fatal_fr(r, "copy key");
|
|
RSA_set_method(ret->rsa, helper->rsa_meth);
|
|
if (helper->nrsa++ >= INT_MAX)
|
|
fatal_f("RSA refcount error");
|
|
} else if (priv->type == KEY_ECDSA) {
|
|
if ((helper = helper_by_ec(priv->ecdsa)) == NULL ||
|
|
helper->fd == -1)
|
|
fatal_f("no helper for PKCS11 EC key");
|
|
if ((r = sshkey_from_private(priv, &ret)) != 0)
|
|
fatal_fr(r, "copy key");
|
|
EC_KEY_set_method(ret->ecdsa, helper->ec_meth);
|
|
if (helper->nec++ >= INT_MAX)
|
|
fatal_f("EC refcount error");
|
|
} else
|
|
fatal_f("unknown key type %s", sshkey_type(priv));
|
|
|
|
ret->flags |= SSHKEY_FLAG_EXT;
|
|
if ((r = sshkey_to_certified(ret)) != 0 ||
|
|
(r = sshkey_cert_copy(certpub, ret)) != 0)
|
|
fatal_fr(r, "graft certificate");
|
|
debug3_f("provider %s remaining keys: %zu RSA %zu ECDSA",
|
|
helper->path, helper->nrsa, helper->nec);
|
|
/* success */
|
|
*certprivp = ret;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
pkcs11_start_helper_methods(struct helper *helper)
|
|
{
|
|
int (*ec_init)(EC_KEY *key);
|
|
int (*ec_copy)(EC_KEY *dest, const EC_KEY *src);
|
|
int (*ec_set_group)(EC_KEY *key, const EC_GROUP *grp);
|
|
int (*ec_set_private)(EC_KEY *key, const BIGNUM *priv_key);
|
|
int (*ec_set_public)(EC_KEY *key, const EC_POINT *pub_key);
|
|
int (*ec_sign)(int, const unsigned char *, int, unsigned char *,
|
|
unsigned int *, const BIGNUM *, const BIGNUM *, EC_KEY *) = NULL;
|
|
RSA_METHOD *rsa_meth;
|
|
EC_KEY_METHOD *ec_meth;
|
|
|
|
if ((ec_meth = EC_KEY_METHOD_new(EC_KEY_OpenSSL())) == NULL)
|
|
return -1;
|
|
EC_KEY_METHOD_get_sign(ec_meth, &ec_sign, NULL, NULL);
|
|
EC_KEY_METHOD_set_sign(ec_meth, ec_sign, NULL, ecdsa_do_sign);
|
|
EC_KEY_METHOD_get_init(ec_meth, &ec_init, &helper->ec_finish,
|
|
&ec_copy, &ec_set_group, &ec_set_private, &ec_set_public);
|
|
EC_KEY_METHOD_set_init(ec_meth, ec_init, ecdsa_do_finish,
|
|
ec_copy, ec_set_group, ec_set_private, ec_set_public);
|
|
|
|
if ((rsa_meth = RSA_meth_dup(RSA_get_default_method())) == NULL)
|
|
fatal_f("RSA_meth_dup failed");
|
|
helper->rsa_finish = RSA_meth_get_finish(rsa_meth);
|
|
if (!RSA_meth_set1_name(rsa_meth, "ssh-pkcs11-helper") ||
|
|
!RSA_meth_set_priv_enc(rsa_meth, rsa_encrypt) ||
|
|
!RSA_meth_set_finish(rsa_meth, rsa_finish))
|
|
fatal_f("failed to prepare method");
|
|
|
|
helper->ec_meth = ec_meth;
|
|
helper->rsa_meth = rsa_meth;
|
|
return 0;
|
|
}
|
|
|
|
static struct helper *
|
|
pkcs11_start_helper(const char *path)
|
|
{
|
|
int pair[2];
|
|
char *prog, *verbosity = NULL;
|
|
struct helper *helper;
|
|
pid_t pid;
|
|
|
|
if (nhelpers >= INT_MAX)
|
|
fatal_f("too many helpers");
|
|
debug3_f("start helper for %s", path);
|
|
if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) {
|
|
error_f("socketpair: %s", strerror(errno));
|
|
return NULL;
|
|
}
|
|
helper = xcalloc(1, sizeof(*helper));
|
|
if (pkcs11_start_helper_methods(helper) == -1) {
|
|
error_f("pkcs11_start_helper_methods failed");
|
|
goto fail;
|
|
}
|
|
if ((pid = fork()) == -1) {
|
|
error_f("fork: %s", strerror(errno));
|
|
fail:
|
|
close(pair[0]);
|
|
close(pair[1]);
|
|
RSA_meth_free(helper->rsa_meth);
|
|
EC_KEY_METHOD_free(helper->ec_meth);
|
|
free(helper);
|
|
return NULL;
|
|
} else if (pid == 0) {
|
|
if ((dup2(pair[1], STDIN_FILENO) == -1) ||
|
|
(dup2(pair[1], STDOUT_FILENO) == -1)) {
|
|
fprintf(stderr, "dup2: %s\n", strerror(errno));
|
|
_exit(1);
|
|
}
|
|
close(pair[0]);
|
|
close(pair[1]);
|
|
prog = getenv("SSH_PKCS11_HELPER");
|
|
if (prog == NULL || strlen(prog) == 0)
|
|
prog = _PATH_SSH_PKCS11_HELPER;
|
|
if (log_level_get() >= SYSLOG_LEVEL_DEBUG1)
|
|
verbosity = "-vvv";
|
|
debug_f("starting %s %s", prog,
|
|
verbosity == NULL ? "" : verbosity);
|
|
execlp(prog, prog, verbosity, (char *)NULL);
|
|
fprintf(stderr, "exec: %s: %s\n", prog, strerror(errno));
|
|
_exit(1);
|
|
}
|
|
close(pair[1]);
|
|
helper->fd = pair[0];
|
|
helper->path = xstrdup(path);
|
|
helper->pid = pid;
|
|
debug3_f("helper %zu for \"%s\" on fd %d pid %ld", nhelpers,
|
|
helper->path, helper->fd, (long)helper->pid);
|
|
helpers = xrecallocarray(helpers, nhelpers,
|
|
nhelpers + 1, sizeof(*helpers));
|
|
helpers[nhelpers++] = helper;
|
|
return helper;
|
|
}
|
|
|
|
int
|
|
pkcs11_add_provider(char *name, char *pin, struct sshkey ***keysp,
|
|
char ***labelsp)
|
|
{
|
|
struct sshkey *k;
|
|
int r, type;
|
|
u_char *blob;
|
|
char *label;
|
|
size_t blen;
|
|
u_int nkeys, i;
|
|
struct sshbuf *msg;
|
|
struct helper *helper;
|
|
|
|
if ((helper = helper_by_provider(name)) == NULL &&
|
|
(helper = pkcs11_start_helper(name)) == NULL)
|
|
return -1;
|
|
|
|
if ((msg = sshbuf_new()) == NULL)
|
|
fatal_f("sshbuf_new failed");
|
|
if ((r = sshbuf_put_u8(msg, SSH_AGENTC_ADD_SMARTCARD_KEY)) != 0 ||
|
|
(r = sshbuf_put_cstring(msg, name)) != 0 ||
|
|
(r = sshbuf_put_cstring(msg, pin)) != 0)
|
|
fatal_fr(r, "compose");
|
|
send_msg(helper->fd, msg);
|
|
sshbuf_reset(msg);
|
|
|
|
type = recv_msg(helper->fd, msg);
|
|
if (type == SSH2_AGENT_IDENTITIES_ANSWER) {
|
|
if ((r = sshbuf_get_u32(msg, &nkeys)) != 0)
|
|
fatal_fr(r, "parse nkeys");
|
|
*keysp = xcalloc(nkeys, sizeof(struct sshkey *));
|
|
if (labelsp)
|
|
*labelsp = xcalloc(nkeys, sizeof(char *));
|
|
for (i = 0; i < nkeys; i++) {
|
|
/* XXX clean up properly instead of fatal() */
|
|
if ((r = sshbuf_get_string(msg, &blob, &blen)) != 0 ||
|
|
(r = sshbuf_get_cstring(msg, &label, NULL)) != 0)
|
|
fatal_fr(r, "parse key");
|
|
if ((r = sshkey_from_blob(blob, blen, &k)) != 0)
|
|
fatal_fr(r, "decode key");
|
|
wrap_key(helper, k);
|
|
(*keysp)[i] = k;
|
|
if (labelsp)
|
|
(*labelsp)[i] = label;
|
|
else
|
|
free(label);
|
|
free(blob);
|
|
}
|
|
} else if (type == SSH2_AGENT_FAILURE) {
|
|
if ((r = sshbuf_get_u32(msg, &nkeys)) != 0)
|
|
nkeys = -1;
|
|
} else {
|
|
nkeys = -1;
|
|
}
|
|
sshbuf_free(msg);
|
|
return (nkeys);
|
|
}
|
|
|
|
int
|
|
pkcs11_del_provider(char *name)
|
|
{
|
|
struct helper *helper;
|
|
|
|
/*
|
|
* ssh-agent deletes keys before calling this, so the helper entry
|
|
* should be gone before we get here.
|
|
*/
|
|
debug3_f("delete %s", name);
|
|
if ((helper = helper_by_provider(name)) != NULL)
|
|
helper_terminate(helper);
|
|
return 0;
|
|
}
|