[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 1.34 2001/04/14 04:31:01 deraadt 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

/* we keep a cache of one passphrases */
static char *pass = NULL;
void
clear_pass(void)
{
	if (pass) {
		memset(pass, 0, strlen(pass));
		xfree(pass);
		pass = NULL;
	}
}

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

	public = key_load_public(filename, &comment);
	if (public == NULL) {
		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 *private;
	char *comment = NULL, *askpass = NULL;
	char buf[1024], msg[1024];
	int interactive = isatty(STDIN_FILENO);

	if (stat(filename, &st) < 0) {
		perror(filename);
		exit(1);
	}
	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_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();
		printf("Need passphrase for %.200s\n", filename);
		if (!interactive && askpass == NULL) {
			xfree(comment);
			return;
		}
		snprintf(msg, sizeof msg, "Enter passphrase for %.200s", comment);
		for (;;) {
			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);
				pass = NULL;
				xfree(comment);
				return;
			}
			private = key_load_private(filename, pass, &comment);
			if (private != NULL)
				break;
			clear_pass();
			strlcpy(msg, "Bad passphrase, try again", sizeof msg);
		}
	}
	if (ssh_add_identity(ac, private, comment))
		fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
	else
		fprintf(stderr, "Could not add identity: %s\n", filename);
	xfree(comment);
	key_free(private);
}

void
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 (!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);
	}
	clear_pass();
	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,
f3c7c613	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"
f03228b1	38	RCSID("$OpenBSD: ssh-add.c,v 1.34 2001/04/14 04:31:01 deraadt 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
a8666d84	58	/* we keep a cache of one passphrases */
	59	static char *pass = NULL;
	60	void
	61	clear_pass(void)
	62	{
	63	if (pass) {
	64	memset(pass, 0, strlen(pass));
	65	xfree(pass);
	66	pass = NULL;
	67	}
	68	}
	69
8efc0c15	70	void
5068f573	71	delete_file(AuthenticationConnection ac, const char filename)
8efc0c15	72	{
a306f2dd	73	Key *public;
d64050ef	74	char *comment = NULL;
5260325f	75
aeaa3d9e	76	public = key_load_public(filename, &comment);
	77	if (public == NULL) {
	78	printf("Bad key file %s\n", filename);
	79	return;
5260325f	80	}
2e73a022	81	if (ssh_remove_identity(ac, public))
5260325f	82	fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment);
	83	else
	84	fprintf(stderr, "Could not remove identity: %s\n", filename);
a306f2dd	85	key_free(public);
5260325f	86	xfree(comment);
8efc0c15	87	}
8efc0c15	88
2e73a022	89	/* Send a request to remove all identities. */
8efc0c15	90	void
5068f573	91	delete_all(AuthenticationConnection *ac)
8efc0c15	92	{
2e73a022	93	int success = 1;
	94
	95	if (!ssh_remove_all_identities(ac, 1))
	96	success = 0;
	97	/* ignore error-code for ssh2 */
	98	ssh_remove_all_identities(ac, 2);
	99
	100	if (success)
5260325f	101	fprintf(stderr, "All identities removed.\n");
5260325f	102	else
b5c334cc	103	fprintf(stderr, "Failed to remove all identities.\n");
8efc0c15	104	}
8efc0c15	105
aa3378df	106	char *
	107	ssh_askpass(char askpass, char msg)
	108	{
	109	pid_t pid;
	110	size_t len;
	111	char nl, pass;
	112	int p[2], status;
	113	char buf[1024];
	114
42f11eb2	115	if (fflush(stdout) != 0)
42f11eb2	116	error("ssh_askpass: fflush: %s", strerror(errno));
aa3378df	117	if (askpass == NULL)
	118	fatal("internal error: askpass undefined");
	119	if (pipe(p) < 0)
	120	fatal("ssh_askpass: pipe: %s", strerror(errno));
	121	if ((pid = fork()) < 0)
	122	fatal("ssh_askpass: fork: %s", strerror(errno));
	123	if (pid == 0) {
	124	close(p[0]);
	125	if (dup2(p[1], STDOUT_FILENO) < 0)
	126	fatal("ssh_askpass: dup2: %s", strerror(errno));
	127	execlp(askpass, askpass, msg, (char *) 0);
	128	fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno));
	129	}
	130	close(p[1]);
42f11eb2	131	len = read(p[0], buf, sizeof buf);
aa3378df	132	close(p[0]);
	133	while (waitpid(pid, &status, 0) < 0)
	134	if (errno != EINTR)
	135	break;
	136	if (len <= 1)
	137	return xstrdup("");
	138	nl = strchr(buf, '\n');
	139	if (nl)
	140	*nl = '\0';
	141	pass = xstrdup(buf);
	142	memset(buf, 0, sizeof(buf));
	143	return pass;
	144	}
	145
8efc0c15	146	void
5068f573	147	add_file(AuthenticationConnection ac, const char filename)
8efc0c15	148	{
2e73a022	149	struct stat st;
a306f2dd	150	Key *private;
a8666d84	151	char comment = NULL, askpass = NULL;
aa3378df	152	char buf[1024], msg[1024];
aa3378df	153	int interactive = isatty(STDIN_FILENO);
5260325f	154
2e73a022	155	if (stat(filename, &st) < 0) {
	156	perror(filename);
	157	exit(1);
	158	}
57112b5a	159	if (!interactive && getenv("DISPLAY")) {
	160	if (getenv(SSH_ASKPASS_ENV))
	161	askpass = getenv(SSH_ASKPASS_ENV);
	162	else
42f11eb2	163	askpass = _PATH_SSH_ASKPASS_DEFAULT;
57112b5a	164	}
aa3378df	165
5260325f	166	/* At first, try empty passphrase */
aeaa3d9e	167	private = key_load_private(filename, "", &comment);
	168	if (comment == NULL)
	169	comment = xstrdup(filename);
a8666d84	170	/* try last */
	171	if (private == NULL && pass != NULL)
	172	private = key_load_private(filename, pass, NULL);
aeaa3d9e	173	if (private == NULL) {
a8666d84	174	/* clear passphrase since it did not work */
a8666d84	175	clear_pass();
aa3378df	176	printf("Need passphrase for %.200s\n", filename);
aa3378df	177	if (!interactive && askpass == NULL) {
aeaa3d9e	178	xfree(comment);
aa3378df	179	return;
5260325f	180	}
aeaa3d9e	181	snprintf(msg, sizeof msg, "Enter passphrase for %.200s", comment);
aa3378df	182	for (;;) {
aa3378df	183	if (interactive) {
	184	snprintf(buf, sizeof buf, "%s: ", msg);
	185	pass = read_passphrase(buf, 1);
	186	} else {
	187	pass = ssh_askpass(askpass, msg);
	188	}
5260325f	189	if (strcmp(pass, "") == 0) {
5260325f	190	xfree(pass);
f03228b1	191	pass = NULL;
aeaa3d9e	192	xfree(comment);
5260325f	193	return;
5260325f	194	}
aeaa3d9e	195	private = key_load_private(filename, pass, &comment);
aeaa3d9e	196	if (private != NULL)
5260325f	197	break;
a8666d84	198	clear_pass();
aa3378df	199	strlcpy(msg, "Bad passphrase, try again", sizeof msg);
5260325f	200	}
5260325f	201	}
aeaa3d9e	202	if (ssh_add_identity(ac, private, comment))
aeaa3d9e	203	fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
5260325f	204	else
5260325f	205	fprintf(stderr, "Could not add identity: %s\n", filename);
aeaa3d9e	206	xfree(comment);
a306f2dd	207	key_free(private);
8efc0c15	208	}
	209
	210	void
22138a36	211	list_identities(AuthenticationConnection *ac, int do_fp)
8efc0c15	212	{
2e73a022	213	Key *key;
22138a36	214	char comment, fp;
2e73a022	215	int had_identities = 0;
	216	int version;
	217
	218	for (version = 1; version <= 2; version++) {
	219	for (key = ssh_get_first_identity(ac, &comment, version);
	220	key != NULL;
	221	key = ssh_get_next_identity(ac, &comment, version)) {
	222	had_identities = 1;
22138a36	223	if (do_fp) {
	224	fp = key_fingerprint(key, SSH_FP_MD5,
	225	SSH_FP_HEX);
fa08c86b	226	printf("%d %s %s (%s)\n",
22138a36	227	key_size(key), fp, comment, key_type(key));
22138a36	228	xfree(fp);
5260325f	229	} else {
2e73a022	230	if (!key_write(key, stdout))
	231	fprintf(stderr, "key_write failed");
	232	fprintf(stdout, " %s\n", comment);
5260325f	233	}
2e73a022	234	key_free(key);
2e73a022	235	xfree(comment);
5260325f	236	}
f095fcc7	237	}
5260325f	238	if (!had_identities)
5260325f	239	printf("The agent has no identities.\n");
8efc0c15	240	}
	241
	242	int
5068f573	243	main(int argc, char **argv)
8efc0c15	244	{
5260325f	245	AuthenticationConnection *ac = NULL;
	246	struct passwd *pw;
	247	char buf[1024];
	248	int no_files = 1;
	249	int i;
	250	int deleting = 0;
	251
260d427b	252	__progname = get_progname(argv[0]);
264dce47	253	init_rng();
264dce47	254
2b87da3b	255	SSLeay_add_all_algorithms();
2e73a022	256
5260325f	257	/* At first, get a connection to the authentication agent. */
	258	ac = ssh_get_authentication_connection();
	259	if (ac == NULL) {
	260	fprintf(stderr, "Could not open a connection to your authentication agent.\n");
	261	exit(1);
8efc0c15	262	}
5260325f	263	for (i = 1; i < argc; i++) {
	264	if ((strcmp(argv[i], "-l") == 0) \|\|
	265	(strcmp(argv[i], "-L") == 0)) {
	266	list_identities(ac, argv[i][1] == 'l' ? 1 : 0);
	267	/* Don't default-add/delete if -l. */
	268	no_files = 0;
	269	continue;
	270	}
	271	if (strcmp(argv[i], "-d") == 0) {
	272	deleting = 1;
	273	continue;
	274	}
	275	if (strcmp(argv[i], "-D") == 0) {
	276	delete_all(ac);
	277	no_files = 0;
	278	continue;
	279	}
	280	no_files = 0;
	281	if (deleting)
	282	delete_file(ac, argv[i]);
	283	else
	284	add_file(ac, argv[i]);
8efc0c15	285	}
5260325f	286	if (no_files) {
	287	pw = getpwuid(getuid());
	288	if (!pw) {
14a9a859	289	fprintf(stderr, "No user found with uid %u\n",
14a9a859	290	(u_int)getuid());
5260325f	291	ssh_close_authentication_connection(ac);
	292	exit(1);
	293	}
42f11eb2	294	snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, _PATH_SSH_CLIENT_IDENTITY);
5260325f	295	if (deleting)
	296	delete_file(ac, buf);
	297	else
	298	add_file(ac, buf);
8efc0c15	299	}
a8666d84	300	clear_pass();
5260325f	301	ssh_close_authentication_connection(ac);
5260325f	302	exit(0);
8efc0c15	303	}