+/* $OpenBSD: ssh-add.c,v 1.91 2009/08/27 17:44:52 djm Exp $ */
/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ * Adds an identity to the authentication server, or removes an identity.
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ * SSH2 implementation,
+ * Copyright (c) 2000, 2001 Markus Friedl. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
-ssh-add.c
+#include "includes.h"
-Author: Tatu Ylonen <ylo@cs.hut.fi>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/param.h>
-Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- All rights reserved
+#include <openssl/evp.h>
+#include "openbsd-compat/openssl-compat.h"
-Created: Thu Apr 6 00:52:24 1995 ylo
+#include <fcntl.h>
+#include <pwd.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
-Adds an identity to the authentication server, or removes an identity.
+#include "xmalloc.h"
+#include "ssh.h"
+#include "rsa.h"
+#include "log.h"
+#include "key.h"
+#include "buffer.h"
+#include "authfd.h"
+#include "authfile.h"
+#include "pathnames.h"
+#include "misc.h"
-*/
+/* argv0 */
+extern char *__progname;
-#include "includes.h"
-RCSID("$Id$");
+/* Default files to add */
+static char *default_files[] = {
+ _PATH_SSH_CLIENT_ID_RSA,
+ _PATH_SSH_CLIENT_ID_DSA,
+ _PATH_SSH_CLIENT_IDENTITY,
+ NULL
+};
-#include "rsa.h"
-#include "ssh.h"
-#include "xmalloc.h"
-#include "authfd.h"
-#include "fingerprint.h"
+/* Default lifetime (0 == forever) */
+static int lifetime = 0;
-#ifdef USE_EXTERNAL_ASKPASS
-int askpass(const char *filename, RSA *key, const char *saved_comment, char **comment);
-#endif /* USE_EXTERNAL_ASKPASS */
+/* User has to confirm key use */
+static int confirm = 0;
-#ifdef HAVE___PROGNAME
-extern char *__progname;
-#else /* HAVE___PROGNAME */
-const char *__progname = "ssh-add";
-#endif /* HAVE___PROGNAME */
+/* we keep a cache of one passphrases */
+static char *pass = NULL;
+static void
+clear_pass(void)
+{
+ if (pass) {
+ memset(pass, 0, strlen(pass));
+ xfree(pass);
+ pass = NULL;
+ }
+}
-void
+static int
delete_file(AuthenticationConnection *ac, const char *filename)
{
- RSA *key;
- char *comment;
-
- key = RSA_new();
- if (!load_public_key(filename, key, &comment))
- {
- printf("Bad key file %s: %s\n", filename, strerror(errno));
- return;
- }
-
- if (ssh_remove_identity(ac, key))
- fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment);
- else
- fprintf(stderr, "Could not remove identity: %s\n", filename);
- RSA_free(key);
- xfree(comment);
+ Key *public;
+ char *comment = NULL;
+ int ret = -1;
+
+ public = key_load_public(filename, &comment);
+ if (public == NULL) {
+ printf("Bad key file %s\n", filename);
+ return -1;
+ }
+ if (ssh_remove_identity(ac, public)) {
+ fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment);
+ ret = 0;
+ } else
+ fprintf(stderr, "Could not remove identity: %s\n", filename);
+
+ key_free(public);
+ xfree(comment);
+
+ return ret;
}
-void
+/* Send a request to remove all identities. */
+static int
delete_all(AuthenticationConnection *ac)
{
- /* Send a request to remove all identities. */
- if (ssh_remove_all_identities(ac))
- fprintf(stderr, "All identities removed.\n");
- else
- fprintf(stderr, "Failed to remove all identitities.\n");
+ int ret = -1;
+
+ if (ssh_remove_all_identities(ac, 1))
+ ret = 0;
+ /* ignore error-code for ssh2 */
+ ssh_remove_all_identities(ac, 2);
+
+ if (ret == 0)
+ fprintf(stderr, "All identities removed.\n");
+ else
+ fprintf(stderr, "Failed to remove all identities.\n");
+
+ return ret;
}
-void
+static int
add_file(AuthenticationConnection *ac, const char *filename)
{
- RSA *key;
- RSA *public_key;
- char *saved_comment, *comment;
- int success;
-
- key = RSA_new();
- public_key = RSA_new();
- if (!load_public_key(filename, public_key, &saved_comment))
- {
- printf("Bad key file %s: %s\n", filename, strerror(errno));
- return;
- }
- RSA_free(public_key);
-
- /* At first, try empty passphrase */
- success = load_private_key(filename, "", key, &comment);
- if (!success) {
- printf("Need passphrase for %s (%s).\n", filename, saved_comment);
- if (!isatty(STDIN_FILENO)) {
-#ifdef USE_EXTERNAL_ASKPASS
- int prompts = 3;
-
- while (prompts && !success)
- {
- success = askpass(filename, key, saved_comment, &comment);
- prompts--;
+ Key *private;
+ char *comment = NULL;
+ char msg[1024];
+ int fd, perms_ok, ret = -1;
+
+ if ((fd = open(filename, O_RDONLY)) < 0) {
+ perror(filename);
+ return -1;
+ }
+
+ /*
+ * Since we'll try to load a keyfile multiple times, permission errors
+ * will occur multiple times, so check perms first and bail if wrong.
+ */
+ perms_ok = key_perm_ok(fd, filename);
+ close(fd);
+ if (!perms_ok)
+ return -1;
+
+ /* At first, try empty passphrase */
+ private = key_load_private(filename, "", &comment);
+ if (comment == NULL)
+ comment = xstrdup(filename);
+ /* try last */
+ if (private == NULL && pass != NULL)
+ private = key_load_private(filename, pass, NULL);
+ if (private == NULL) {
+ /* clear passphrase since it did not work */
+ clear_pass();
+ snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ",
+ comment);
+ for (;;) {
+ pass = read_passphrase(msg, RP_ALLOW_STDIN);
+ if (strcmp(pass, "") == 0) {
+ clear_pass();
+ xfree(comment);
+ return -1;
+ }
+ private = key_load_private(filename, pass, &comment);
+ if (private != NULL)
+ break;
+ clear_pass();
+ snprintf(msg, sizeof msg,
+ "Bad passphrase, try again for %.200s: ", comment);
+ }
+ }
+
+ if (ssh_add_identity_constrained(ac, private, comment, lifetime,
+ confirm)) {
+ fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
+ ret = 0;
+ if (lifetime != 0)
+ fprintf(stderr,
+ "Lifetime set to %d seconds\n", lifetime);
+ if (confirm != 0)
+ fprintf(stderr,
+ "The user has to confirm each use of the key\n");
+ } else {
+ fprintf(stderr, "Could not add identity: %s\n", filename);
+ }
+
+ xfree(comment);
+ key_free(private);
+
+ return ret;
+}
+
+static int
+update_card(AuthenticationConnection *ac, int add, const char *id)
+{
+ char *pin;
+ int ret = -1;
+
+ pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
+ if (pin == NULL)
+ return -1;
+
+ if (ssh_update_card(ac, add, id, pin, lifetime, confirm)) {
+ fprintf(stderr, "Card %s: %s\n",
+ add ? "added" : "removed", id);
+ ret = 0;
+ } else {
+ fprintf(stderr, "Could not %s card: %s\n",
+ add ? "add" : "remove", id);
+ ret = -1;
+ }
+ xfree(pin);
+ return ret;
+}
+
+static int
+list_identities(AuthenticationConnection *ac, int do_fp)
+{
+ Key *key;
+ char *comment, *fp;
+ int had_identities = 0;
+ int version;
+
+ for (version = 1; version <= 2; version++) {
+ for (key = ssh_get_first_identity(ac, &comment, version);
+ key != NULL;
+ key = ssh_get_next_identity(ac, &comment, version)) {
+ had_identities = 1;
+ if (do_fp) {
+ fp = key_fingerprint(key, SSH_FP_MD5,
+ SSH_FP_HEX);
+ printf("%d %s %s (%s)\n",
+ key_size(key), fp, comment, key_type(key));
+ xfree(fp);
+ } else {
+ if (!key_write(key, stdout))
+ fprintf(stderr, "key_write failed");
+ fprintf(stdout, " %s\n", comment);
+ }
+ key_free(key);
+ xfree(comment);
}
- if (!success)
- {
- xfree(saved_comment);
- return;
+ }
+ if (!had_identities) {
+ printf("The agent has no identities.\n");
+ return -1;
+ }
+ return 0;
+}
+
+static int
+lock_agent(AuthenticationConnection *ac, int lock)
+{
+ char prompt[100], *p1, *p2;
+ int passok = 1, ret = -1;
+
+ strlcpy(prompt, "Enter lock password: ", sizeof(prompt));
+ p1 = read_passphrase(prompt, RP_ALLOW_STDIN);
+ if (lock) {
+ strlcpy(prompt, "Again: ", sizeof prompt);
+ p2 = read_passphrase(prompt, RP_ALLOW_STDIN);
+ if (strcmp(p1, p2) != 0) {
+ fprintf(stderr, "Passwords do not match.\n");
+ passok = 0;
}
-#else /* !USE_EXTERNAL_ASKPASS */
- xfree(saved_comment);
- return;
-#endif /* USE_EXTERNAL_ASKPASS */
- }
-
- while (!success) {
- char *pass = read_passphrase("Enter passphrase: ", 1);
- if (strcmp(pass, "") == 0){
- xfree(pass);
- xfree(saved_comment);
- return;
- }
- success = load_private_key(filename, pass, key, &comment);
- memset(pass, 0, strlen(pass));
- xfree(pass);
- if (success)
- break;
- printf("Bad passphrase.\n");
- }
- }
- xfree(saved_comment);
-
- if (ssh_add_identity(ac, key, comment))
- fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
- else
- fprintf(stderr, "Could not add identity: %s\n", filename);
- RSA_free(key);
- xfree(comment);
+ memset(p2, 0, strlen(p2));
+ xfree(p2);
+ }
+ if (passok && ssh_lock_agent(ac, lock, p1)) {
+ fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un");
+ ret = 0;
+ } else
+ fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un");
+ memset(p1, 0, strlen(p1));
+ xfree(p1);
+ return (ret);
}
-void
-list_identities(AuthenticationConnection *ac, int fp)
+static int
+do_file(AuthenticationConnection *ac, int deleting, char *file)
{
- BIGNUM *e, *n;
- int status;
- char *comment;
- int had_identities;
-
- e = BN_new();
- n = BN_new();
- had_identities = 0;
- for (status = ssh_get_first_identity(ac, e, n, &comment);
- status;
- status = ssh_get_next_identity(ac, e, n, &comment))
- {
- unsigned int bits = BN_num_bits(n);
- had_identities = 1;
- if (fp) {
- printf("%d %s %s\n", bits, fingerprint(e, n), comment);
- } else {
- char *ebuf, *nbuf;
- ebuf = BN_bn2dec(e);
- if (ebuf == NULL) {
- error("list_identities: BN_bn2dec(e) failed.");
- }else{
- nbuf = BN_bn2dec(n);
- if (nbuf == NULL) {
- error("list_identities: BN_bn2dec(n) failed.");
- }else{
- printf("%d %s %s %s\n", bits, ebuf, nbuf, comment);
- free(nbuf);
- }
- free(ebuf);
+ if (deleting) {
+ if (delete_file(ac, file) == -1)
+ return -1;
+ } else {
+ if (add_file(ac, file) == -1)
+ return -1;
}
- }
- xfree(comment);
- }
- BN_clear_free(e);
- BN_clear_free(n);
- if (!had_identities)
- printf("The agent has no identities.\n");
+ return 0;
+}
+
+static void
+usage(void)
+{
+ fprintf(stderr, "usage: %s [options] [file ...]\n", __progname);
+ fprintf(stderr, "Options:\n");
+ fprintf(stderr, " -l List fingerprints of all identities.\n");
+ fprintf(stderr, " -L List public key parameters of all identities.\n");
+ fprintf(stderr, " -d Delete identity.\n");
+ fprintf(stderr, " -D Delete all identities.\n");
+ fprintf(stderr, " -x Lock agent.\n");
+ fprintf(stderr, " -X Unlock agent.\n");
+ fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n");
+ fprintf(stderr, " -c Require confirmation to sign using identities\n");
+#ifdef SMARTCARD
+ fprintf(stderr, " -s reader Add key in smartcard reader.\n");
+ fprintf(stderr, " -e reader Remove key in smartcard reader.\n");
+#endif
}
int
main(int argc, char **argv)
{
- AuthenticationConnection *ac = NULL;
- struct passwd *pw;
- char buf[1024];
- int no_files = 1;
- int i;
- int deleting = 0;
-
- /* check if RSA support exists */
- if (rsa_alive() == 0) {
- extern char *__progname;
-
- fprintf(stderr,
- "%s: no RSA support in libssl and libcrypto. See ssl(8).\n",
- __progname);
- exit(1);
- }
-
- /* At first, get a connection to the authentication agent. */
- ac = ssh_get_authentication_connection();
- if (ac == NULL) {
- fprintf(stderr, "Could not open a connection to your authentication agent.\n");
- exit(1);
- }
-
- for (i = 1; i < argc; i++)
- {
- if ((strcmp(argv[i], "-l") == 0) ||
- (strcmp(argv[i], "-L") == 0))
- {
- list_identities(ac, argv[i][1] == 'l' ? 1 : 0);
- no_files = 0; /* Don't default-add/delete if -l. */
- continue;
+ extern char *optarg;
+ extern int optind;
+ AuthenticationConnection *ac = NULL;
+ char *sc_reader_id = NULL;
+ int i, ch, deleting = 0, ret = 0;
+
+ /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
+ sanitise_stdfd();
+
+ __progname = ssh_get_progname(argv[0]);
+ init_rng();
+ seed_rng();
+
+ SSLeay_add_all_algorithms();
+
+ /* At first, get a connection to the authentication agent. */
+ ac = ssh_get_authentication_connection();
+ if (ac == NULL) {
+ fprintf(stderr,
+ "Could not open a connection to your authentication agent.\n");
+ exit(2);
}
- if (strcmp(argv[i], "-d") == 0)
- {
- deleting = 1;
- continue;
+ while ((ch = getopt(argc, argv, "lLcdDxXe:s:t:")) != -1) {
+ switch (ch) {
+ case 'l':
+ case 'L':
+ if (list_identities(ac, ch == 'l' ? 1 : 0) == -1)
+ ret = 1;
+ goto done;
+ case 'x':
+ case 'X':
+ if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1)
+ ret = 1;
+ goto done;
+ case 'c':
+ confirm = 1;
+ break;
+ case 'd':
+ deleting = 1;
+ break;
+ case 'D':
+ if (delete_all(ac) == -1)
+ ret = 1;
+ goto done;
+ case 's':
+ sc_reader_id = optarg;
+ break;
+ case 'e':
+ deleting = 1;
+ sc_reader_id = optarg;
+ break;
+ case 't':
+ if ((lifetime = convtime(optarg)) == -1) {
+ fprintf(stderr, "Invalid lifetime\n");
+ ret = 1;
+ goto done;
+ }
+ break;
+ default:
+ usage();
+ ret = 1;
+ goto done;
+ }
}
- if (strcmp(argv[i], "-D") == 0)
- {
- delete_all(ac);
- no_files = 0;
- continue;
+ argc -= optind;
+ argv += optind;
+ if (sc_reader_id != NULL) {
+ if (update_card(ac, !deleting, sc_reader_id) == -1)
+ ret = 1;
+ goto done;
}
- no_files = 0;
- if (deleting)
- delete_file(ac, argv[i]);
- else
- add_file(ac, argv[i]);
- }
- if (no_files)
- {
- pw = getpwuid(getuid());
- if (!pw)
- {
- fprintf(stderr, "No user found with uid %d\n", (int)getuid());
- ssh_close_authentication_connection(ac);
- exit(1);
+ if (argc == 0) {
+ char buf[MAXPATHLEN];
+ struct passwd *pw;
+ struct stat st;
+ int count = 0;
+
+ if ((pw = getpwuid(getuid())) == NULL) {
+ fprintf(stderr, "No user found with uid %u\n",
+ (u_int)getuid());
+ ret = 1;
+ goto done;
+ }
+
+ for (i = 0; default_files[i]; i++) {
+ snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir,
+ default_files[i]);
+ if (stat(buf, &st) < 0)
+ continue;
+ if (do_file(ac, deleting, buf) == -1)
+ ret = 1;
+ else
+ count++;
+ }
+ if (count == 0)
+ ret = 1;
+ } else {
+ for (i = 0; i < argc; i++) {
+ if (do_file(ac, deleting, argv[i]) == -1)
+ ret = 1;
+ }
}
- snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, SSH_CLIENT_IDENTITY);
- if (deleting)
- delete_file(ac, buf);
- else
- add_file(ac, buf);
- }
- ssh_close_authentication_connection(ac);
- exit(0);
-}
+ clear_pass();
-#ifdef USE_EXTERNAL_ASKPASS
-int askpass(const char *filename, RSA *key, const char *saved_comment, char **comment)
-{
- int pipes[2];
- char buf[1024];
- int tmp;
- pid_t child;
- FILE *pipef;
-
- /* Check that we are X11-capable */
- if (getenv("DISPLAY") == NULL)
- exit(1);
-
- if (pipe(pipes) == -1) {
- fprintf(stderr, "Creating pipes failed: %s\n", strerror(errno));
- exit(1);
- }
-
- if (fflush(NULL) == EOF) {
- fprintf(stderr, "Cannot flush buffers: %s\n", strerror(errno));
- exit(1);
- }
-
- child = fork();
- if (child == -1) {
- fprintf(stderr, "Cannot fork: %s\n", strerror(errno));
- exit(1);
- }
-
- if (child == 0) {
- /* In child */
-
- close(pipes[0]);
- if (dup2(pipes[1], 1) ==-1) {
- fprintf(stderr, "dup2 failed: %s\n", strerror(errno));
- exit(1);
- }
-
- tmp = snprintf(buf, sizeof(buf), "Need passphrase for %s (%s)", filename, saved_comment);
- /* skip the prompt if it won't fit */
- if ((tmp < 0) || (tmp >= sizeof(buf)))
- tmp = execlp(ASKPASS_PROGRAM, "ssh-askpass", 0);
- else
- tmp = execlp(ASKPASS_PROGRAM, "ssh-askpass", buf, 0);
-
- /* Shouldn't get this far */
- fprintf(stderr, "Executing ssh-askpass failed: %s\n", strerror(errno));
- exit(1);
- }
-
- /* In parent */
- close(pipes[1]);
-
- if ((pipef = fdopen(pipes[0], "r")) == NULL) {
- fprintf(stderr, "fdopen failed: %s\n", strerror(errno));
- exit(1);
- }
-
- /* Read passphrase back from child, abort if none presented */
- if(fgets(buf, sizeof(buf), pipef) == NULL)
- exit(1);
-
- fclose(pipef);
-
- if (strchr(buf, '\n'))
- *strchr(buf, '\n') = 0;
-
- if (waitpid(child, NULL, 0) == -1) {
- fprintf(stderr, "Waiting for child failed: %s\n",
- strerror(errno));
- exit(1);
- }
-
- /* Try password as it was presented */
- tmp = load_private_key(filename, buf, key, comment);
-
- memset(buf, 0, sizeof(buf));
-
- return(tmp);
+done:
+ ssh_close_authentication_connection(ac);
+ return ret;
}
-#endif /* USE_EXTERNAL_ASKPASS */
andersk / openssh.git / blobdiff