[openssh.git] / ssh-add.c

/*
 * 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 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.
 */

#include "includes.h"
RCSID("$OpenBSD: ssh-add.c,v 1.27 2001/01/21 19:05:56 markus Exp $");

#include <openssl/evp.h>

#include "ssh.h"
#include "rsa.h"
#include "log.h"
#include "xmalloc.h"
#include "key.h"
#include "authfd.h"
#include "authfile.h"
#include "pathnames.h"
#include "readpass.h"

#ifdef HAVE___PROGNAME
extern char *__progname;
#else
char *__progname;
#endif

void
delete_file(AuthenticationConnection *ac, const char *filename)
{
	Key *public;
	char *comment;

	public = key_new(KEY_RSA1);
	if (!load_public_key(filename, public, &comment)) {
		key_free(public);
		public = key_new(KEY_UNSPEC);
		if (!try_load_public_key(filename, public, &comment)) {
			printf("Bad key file %s\n", filename);
			return;
		}
	}
	if (ssh_remove_identity(ac, public))
		fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment);
	else
		fprintf(stderr, "Could not remove identity: %s\n", filename);
	key_free(public);
	xfree(comment);
}

/* Send a request to remove all identities. */
void
delete_all(AuthenticationConnection *ac)
{
	int success = 1;

	if (!ssh_remove_all_identities(ac, 1))
		success = 0;
	/* ignore error-code for ssh2 */
	ssh_remove_all_identities(ac, 2);

	if (success)
		fprintf(stderr, "All identities removed.\n");
	else
		fprintf(stderr, "Failed to remove all identities.\n");
}

char *
ssh_askpass(char *askpass, char *msg)
{
	pid_t pid;
	size_t len;
	char *nl, *pass;
	int p[2], status;
	char buf[1024];

	if (fflush(stdout) != 0)
		error("ssh_askpass: fflush: %s", strerror(errno));
	if (askpass == NULL)
		fatal("internal error: askpass undefined");
	if (pipe(p) < 0)
		fatal("ssh_askpass: pipe: %s", strerror(errno));
	if ((pid = fork()) < 0)
		fatal("ssh_askpass: fork: %s", strerror(errno));
	if (pid == 0) {
		close(p[0]);
		if (dup2(p[1], STDOUT_FILENO) < 0)
			fatal("ssh_askpass: dup2: %s", strerror(errno));
		execlp(askpass, askpass, msg, (char *) 0);
		fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno));
	}
	close(p[1]);
	len = read(p[0], buf, sizeof buf);
	close(p[0]);
	while (waitpid(pid, &status, 0) < 0)
		if (errno != EINTR)
			break;
	if (len <= 1)
		return xstrdup("");
	nl = strchr(buf, '\n');
	if (nl)
		*nl = '\0';
	pass = xstrdup(buf);
	memset(buf, 0, sizeof(buf));
	return pass;
}

void
add_file(AuthenticationConnection *ac, const char *filename)
{
	struct stat st;
	Key *public;
	Key *private;
	char *saved_comment, *comment, *askpass = NULL;
	char buf[1024], msg[1024];
	int success;
	int interactive = isatty(STDIN_FILENO);
	int type = KEY_RSA1;

	if (stat(filename, &st) < 0) {
		perror(filename);
		exit(1);
	}
	/*
	 * try to load the public key. right now this only works for RSA,
	 * since DSA keys are fully encrypted
	 */
	public = key_new(KEY_RSA1);
	if (!load_public_key(filename, public, &saved_comment)) {
		/* ok, so we will assume this is 'some' key */
		type = KEY_UNSPEC;
		saved_comment = xstrdup(filename);
	}
	key_free(public);

	if (!interactive && getenv("DISPLAY")) {
		if (getenv(SSH_ASKPASS_ENV))
			askpass = getenv(SSH_ASKPASS_ENV);
		else
			askpass = _PATH_SSH_ASKPASS_DEFAULT;
	}

	/* At first, try empty passphrase */
	private = key_new(type);
	success = load_private_key(filename, "", private, &comment);
	if (!success) {
		printf("Need passphrase for %.200s\n", filename);
		if (!interactive && askpass == NULL) {
			xfree(saved_comment);
			return;
		}
		snprintf(msg, sizeof msg, "Enter passphrase for %.200s", saved_comment);
		for (;;) {
			char *pass;
			if (interactive) {
				snprintf(buf, sizeof buf, "%s: ", msg);
				pass = read_passphrase(buf, 1);
			} else {
				pass = ssh_askpass(askpass, msg);
			}
			if (strcmp(pass, "") == 0) {
				xfree(pass);
				xfree(saved_comment);
				return;
			}
			success = load_private_key(filename, pass, private, &comment);
			memset(pass, 0, strlen(pass));
			xfree(pass);
			if (success)
				break;
			strlcpy(msg, "Bad passphrase, try again", sizeof msg);
		}
	}
	xfree(comment);
	if (ssh_add_identity(ac, private, saved_comment))
		fprintf(stderr, "Identity added: %s (%s)\n", filename, saved_comment);
	else
		fprintf(stderr, "Could not add identity: %s\n", filename);
	key_free(private);
	xfree(saved_comment);
}

void
list_identities(AuthenticationConnection *ac, int fp)
{
	Key *key;
	char *comment;
	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 (fp) {
				printf("%d %s %s (%s)\n",
				    key_size(key), key_fingerprint(key),
				    comment, key_type(key));
			} else {
				if (!key_write(key, stdout))
					fprintf(stderr, "key_write failed");
				fprintf(stdout, " %s\n", comment);
			}
			key_free(key);
			xfree(comment);
		}
	}
	if (!had_identities)
		printf("The agent has no identities.\n");
}

int
main(int argc, char **argv)
{
	AuthenticationConnection *ac = NULL;
	struct passwd *pw;
	char buf[1024];
	int no_files = 1;
	int i;
	int deleting = 0;

	__progname = get_progname(argv[0]);
	init_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(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);
			/* Don't default-add/delete if -l. */
			no_files = 0;
			continue;
		}
		if (strcmp(argv[i], "-d") == 0) {
			deleting = 1;
			continue;
		}
		if (strcmp(argv[i], "-D") == 0) {
			delete_all(ac);
			no_files = 0;
			continue;
		}
		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 %u\n",
			    (u_int)getuid());
			ssh_close_authentication_connection(ac);
			exit(1);
		}
		snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, _PATH_SSH_CLIENT_IDENTITY);
		if (deleting)
			delete_file(ac, buf);
		else
			add_file(ac, buf);
	}
	ssh_close_authentication_connection(ac);
	exit(0);
}
Commit	Line	Data
8efc0c15	1	/*
5260325f	2	* Author: Tatu Ylonen <ylo@cs.hut.fi>
	3	* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
	4	* All rights reserved
5260325f	5	* Adds an identity to the authentication server, or removes an identity.
2e73a022	6	*
bcbf86ec	7	* As far as I am concerned, the code I have written for this software
	8	* can be used freely for any purpose. Any derived versions of this
	9	* software must be clearly marked as such, and if the derived work is
	10	* incompatible with the protocol description in the RFC file, it must be
	11	* called by a name other than "ssh" or "Secure Shell".
	12	*
2e73a022	13	* SSH2 implementation,
2e73a022	14	* Copyright (c) 2000 Markus Friedl. All rights reserved.
bcbf86ec	15	*
	16	* Redistribution and use in source and binary forms, with or without
	17	* modification, are permitted provided that the following conditions
	18	* are met:
	19	* 1. Redistributions of source code must retain the above copyright
	20	* notice, this list of conditions and the following disclaimer.
	21	* 2. Redistributions in binary form must reproduce the above copyright
	22	* notice, this list of conditions and the following disclaimer in the
	23	* documentation and/or other materials provided with the distribution.
	24	*
	25	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	26	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	27	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	28	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	29	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	30	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	31	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	32	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	33	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	34	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
5260325f	35	*/
8efc0c15	36
8efc0c15	37	#include "includes.h"
42f11eb2	38	RCSID("$OpenBSD: ssh-add.c,v 1.27 2001/01/21 19:05:56 markus Exp $");
8efc0c15	39
2e73a022	40	#include <openssl/evp.h>
a306f2dd	41
8efc0c15	42	#include "ssh.h"
42f11eb2	43	#include "rsa.h"
42f11eb2	44	#include "log.h"
8efc0c15	45	#include "xmalloc.h"
a306f2dd	46	#include "key.h"
4c8722d9	47	#include "authfd.h"
a306f2dd	48	#include "authfile.h"
42f11eb2	49	#include "pathnames.h"
42f11eb2	50	#include "readpass.h"
8efc0c15	51
f601d847	52	#ifdef HAVE___PROGNAME
f601d847	53	extern char *__progname;
260d427b	54	#else
	55	char *__progname;
	56	#endif
f601d847	57
8efc0c15	58	void
5068f573	59	delete_file(AuthenticationConnection ac, const char filename)
8efc0c15	60	{
a306f2dd	61	Key *public;
5260325f	62	char *comment;
5260325f	63
fa08c86b	64	public = key_new(KEY_RSA1);
a306f2dd	65	if (!load_public_key(filename, public, &comment)) {
bcbf86ec	66	key_free(public);
fa08c86b	67	public = key_new(KEY_UNSPEC);
bcbf86ec	68	if (!try_load_public_key(filename, public, &comment)) {
	69	printf("Bad key file %s\n", filename);
	70	return;
	71	}
5260325f	72	}
2e73a022	73	if (ssh_remove_identity(ac, public))
5260325f	74	fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment);
	75	else
	76	fprintf(stderr, "Could not remove identity: %s\n", filename);
a306f2dd	77	key_free(public);
5260325f	78	xfree(comment);
8efc0c15	79	}
8efc0c15	80
2e73a022	81	/* Send a request to remove all identities. */
8efc0c15	82	void
5068f573	83	delete_all(AuthenticationConnection *ac)
8efc0c15	84	{
2e73a022	85	int success = 1;
	86
	87	if (!ssh_remove_all_identities(ac, 1))
	88	success = 0;
	89	/* ignore error-code for ssh2 */
	90	ssh_remove_all_identities(ac, 2);
	91
	92	if (success)
5260325f	93	fprintf(stderr, "All identities removed.\n");
5260325f	94	else
b5c334cc	95	fprintf(stderr, "Failed to remove all identities.\n");
8efc0c15	96	}
8efc0c15	97
aa3378df	98	char *
	99	ssh_askpass(char askpass, char msg)
	100	{
	101	pid_t pid;
	102	size_t len;
	103	char nl, pass;
	104	int p[2], status;
	105	char buf[1024];
	106
42f11eb2	107	if (fflush(stdout) != 0)
42f11eb2	108	error("ssh_askpass: fflush: %s", strerror(errno));
aa3378df	109	if (askpass == NULL)
	110	fatal("internal error: askpass undefined");
	111	if (pipe(p) < 0)
	112	fatal("ssh_askpass: pipe: %s", strerror(errno));
	113	if ((pid = fork()) < 0)
	114	fatal("ssh_askpass: fork: %s", strerror(errno));
	115	if (pid == 0) {
	116	close(p[0]);
	117	if (dup2(p[1], STDOUT_FILENO) < 0)
	118	fatal("ssh_askpass: dup2: %s", strerror(errno));
	119	execlp(askpass, askpass, msg, (char *) 0);
	120	fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno));
	121	}
	122	close(p[1]);
42f11eb2	123	len = read(p[0], buf, sizeof buf);
aa3378df	124	close(p[0]);
	125	while (waitpid(pid, &status, 0) < 0)
	126	if (errno != EINTR)
	127	break;
	128	if (len <= 1)
	129	return xstrdup("");
	130	nl = strchr(buf, '\n');
	131	if (nl)
	132	*nl = '\0';
	133	pass = xstrdup(buf);
	134	memset(buf, 0, sizeof(buf));
	135	return pass;
	136	}
	137
8efc0c15	138	void
5068f573	139	add_file(AuthenticationConnection ac, const char filename)
8efc0c15	140	{
2e73a022	141	struct stat st;
a306f2dd	142	Key *public;
a306f2dd	143	Key *private;
aa3378df	144	char saved_comment, comment, *askpass = NULL;
aa3378df	145	char buf[1024], msg[1024];
5260325f	146	int success;
aa3378df	147	int interactive = isatty(STDIN_FILENO);
fa08c86b	148	int type = KEY_RSA1;
5260325f	149
2e73a022	150	if (stat(filename, &st) < 0) {
	151	perror(filename);
	152	exit(1);
	153	}
4c8722d9	154	/*
	155	* try to load the public key. right now this only works for RSA,
	156	* since DSA keys are fully encrypted
	157	*/
fa08c86b	158	public = key_new(KEY_RSA1);
a306f2dd	159	if (!load_public_key(filename, public, &saved_comment)) {
fa08c86b	160	/* ok, so we will assume this is 'some' key */
fa08c86b	161	type = KEY_UNSPEC;
4c8722d9	162	saved_comment = xstrdup(filename);
5260325f	163	}
a306f2dd	164	key_free(public);
dad9a31e	165
57112b5a	166	if (!interactive && getenv("DISPLAY")) {
	167	if (getenv(SSH_ASKPASS_ENV))
	168	askpass = getenv(SSH_ASKPASS_ENV);
	169	else
42f11eb2	170	askpass = _PATH_SSH_ASKPASS_DEFAULT;
57112b5a	171	}
aa3378df	172
5260325f	173	/* At first, try empty passphrase */
4c8722d9	174	private = key_new(type);
a306f2dd	175	success = load_private_key(filename, "", private, &comment);
5260325f	176	if (!success) {
aa3378df	177	printf("Need passphrase for %.200s\n", filename);
	178	if (!interactive && askpass == NULL) {
	179	xfree(saved_comment);
	180	return;
5260325f	181	}
aa3378df	182	snprintf(msg, sizeof msg, "Enter passphrase for %.200s", saved_comment);
	183	for (;;) {
	184	char *pass;
	185	if (interactive) {
	186	snprintf(buf, sizeof buf, "%s: ", msg);
	187	pass = read_passphrase(buf, 1);
	188	} else {
	189	pass = ssh_askpass(askpass, msg);
	190	}
5260325f	191	if (strcmp(pass, "") == 0) {
	192	xfree(pass);
	193	xfree(saved_comment);
	194	return;
	195	}
a306f2dd	196	success = load_private_key(filename, pass, private, &comment);
5260325f	197	memset(pass, 0, strlen(pass));
	198	xfree(pass);
	199	if (success)
	200	break;
aa3378df	201	strlcpy(msg, "Bad passphrase, try again", sizeof msg);
5260325f	202	}
5260325f	203	}
2e73a022	204	xfree(comment);
	205	if (ssh_add_identity(ac, private, saved_comment))
	206	fprintf(stderr, "Identity added: %s (%s)\n", filename, saved_comment);
5260325f	207	else
5260325f	208	fprintf(stderr, "Could not add identity: %s\n", filename);
a306f2dd	209	key_free(private);
2e73a022	210	xfree(saved_comment);
8efc0c15	211	}
	212
	213	void
f095fcc7	214	list_identities(AuthenticationConnection *ac, int fp)
8efc0c15	215	{
2e73a022	216	Key *key;
5260325f	217	char *comment;
2e73a022	218	int had_identities = 0;
	219	int version;
	220
	221	for (version = 1; version <= 2; version++) {
	222	for (key = ssh_get_first_identity(ac, &comment, version);
	223	key != NULL;
	224	key = ssh_get_next_identity(ac, &comment, version)) {
	225	had_identities = 1;
	226	if (fp) {
fa08c86b	227	printf("%d %s %s (%s)\n",
	228	key_size(key), key_fingerprint(key),
	229	comment, key_type(key));
5260325f	230	} else {
2e73a022	231	if (!key_write(key, stdout))
	232	fprintf(stderr, "key_write failed");
	233	fprintf(stdout, " %s\n", comment);
5260325f	234	}
2e73a022	235	key_free(key);
2e73a022	236	xfree(comment);
5260325f	237	}
f095fcc7	238	}
5260325f	239	if (!had_identities)
5260325f	240	printf("The agent has no identities.\n");
8efc0c15	241	}
	242
	243	int
5068f573	244	main(int argc, char **argv)
8efc0c15	245	{
5260325f	246	AuthenticationConnection *ac = NULL;
	247	struct passwd *pw;
	248	char buf[1024];
	249	int no_files = 1;
	250	int i;
	251	int deleting = 0;
	252
260d427b	253	__progname = get_progname(argv[0]);
264dce47	254	init_rng();
264dce47	255
2e73a022	256	SSLeay_add_all_algorithms();
2e73a022	257
5260325f	258	/* At first, get a connection to the authentication agent. */
	259	ac = ssh_get_authentication_connection();
	260	if (ac == NULL) {
	261	fprintf(stderr, "Could not open a connection to your authentication agent.\n");
	262	exit(1);
8efc0c15	263	}
5260325f	264	for (i = 1; i < argc; i++) {
	265	if ((strcmp(argv[i], "-l") == 0) \|\|
	266	(strcmp(argv[i], "-L") == 0)) {
	267	list_identities(ac, argv[i][1] == 'l' ? 1 : 0);
	268	/* Don't default-add/delete if -l. */
	269	no_files = 0;
	270	continue;
	271	}
	272	if (strcmp(argv[i], "-d") == 0) {
	273	deleting = 1;
	274	continue;
	275	}
	276	if (strcmp(argv[i], "-D") == 0) {
	277	delete_all(ac);
	278	no_files = 0;
	279	continue;
	280	}
	281	no_files = 0;
	282	if (deleting)
	283	delete_file(ac, argv[i]);
	284	else
	285	add_file(ac, argv[i]);
8efc0c15	286	}
5260325f	287	if (no_files) {
	288	pw = getpwuid(getuid());
	289	if (!pw) {
14a9a859	290	fprintf(stderr, "No user found with uid %u\n",
14a9a859	291	(u_int)getuid());
5260325f	292	ssh_close_authentication_connection(ac);
	293	exit(1);
	294	}
42f11eb2	295	snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, _PATH_SSH_CLIENT_IDENTITY);
5260325f	296	if (deleting)
	297	delete_file(ac, buf);
	298	else
	299	add_file(ac, buf);
8efc0c15	300	}
5260325f	301	ssh_close_authentication_connection(ac);
5260325f	302	exit(0);
8efc0c15	303	}