[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 1.31 2001/03/26 08:07:08 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_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, *askpass = NULL, *pass;
	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);
	if (private == NULL) {
		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);
				xfree(comment);
				return;
			}
			private = key_load_private(filename, pass, &comment);
			memset(pass, 0, strlen(pass));
			xfree(pass);
			if (private != NULL)
				break;
			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);
	}
	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"
aeaa3d9e	38	RCSID("$OpenBSD: ssh-add.c,v 1.31 2001/03/26 08:07:08 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
aeaa3d9e	64	public = key_load_public(filename, &comment);
	65	if (public == NULL) {
	66	printf("Bad key file %s\n", filename);
	67	return;
5260325f	68	}
2e73a022	69	if (ssh_remove_identity(ac, public))
5260325f	70	fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment);
	71	else
	72	fprintf(stderr, "Could not remove identity: %s\n", filename);
a306f2dd	73	key_free(public);
5260325f	74	xfree(comment);
8efc0c15	75	}
8efc0c15	76
2e73a022	77	/* Send a request to remove all identities. */
8efc0c15	78	void
5068f573	79	delete_all(AuthenticationConnection *ac)
8efc0c15	80	{
2e73a022	81	int success = 1;
	82
	83	if (!ssh_remove_all_identities(ac, 1))
	84	success = 0;
	85	/* ignore error-code for ssh2 */
	86	ssh_remove_all_identities(ac, 2);
	87
	88	if (success)
5260325f	89	fprintf(stderr, "All identities removed.\n");
5260325f	90	else
b5c334cc	91	fprintf(stderr, "Failed to remove all identities.\n");
8efc0c15	92	}
8efc0c15	93
aa3378df	94	char *
	95	ssh_askpass(char askpass, char msg)
	96	{
	97	pid_t pid;
	98	size_t len;
	99	char nl, pass;
	100	int p[2], status;
	101	char buf[1024];
	102
42f11eb2	103	if (fflush(stdout) != 0)
42f11eb2	104	error("ssh_askpass: fflush: %s", strerror(errno));
aa3378df	105	if (askpass == NULL)
	106	fatal("internal error: askpass undefined");
	107	if (pipe(p) < 0)
	108	fatal("ssh_askpass: pipe: %s", strerror(errno));
	109	if ((pid = fork()) < 0)
	110	fatal("ssh_askpass: fork: %s", strerror(errno));
	111	if (pid == 0) {
	112	close(p[0]);
	113	if (dup2(p[1], STDOUT_FILENO) < 0)
	114	fatal("ssh_askpass: dup2: %s", strerror(errno));
	115	execlp(askpass, askpass, msg, (char *) 0);
	116	fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno));
	117	}
	118	close(p[1]);
42f11eb2	119	len = read(p[0], buf, sizeof buf);
aa3378df	120	close(p[0]);
	121	while (waitpid(pid, &status, 0) < 0)
	122	if (errno != EINTR)
	123	break;
	124	if (len <= 1)
	125	return xstrdup("");
	126	nl = strchr(buf, '\n');
	127	if (nl)
	128	*nl = '\0';
	129	pass = xstrdup(buf);
	130	memset(buf, 0, sizeof(buf));
	131	return pass;
	132	}
	133
8efc0c15	134	void
5068f573	135	add_file(AuthenticationConnection ac, const char filename)
8efc0c15	136	{
2e73a022	137	struct stat st;
a306f2dd	138	Key *private;
aeaa3d9e	139	char comment, askpass = NULL, *pass;
aa3378df	140	char buf[1024], msg[1024];
aa3378df	141	int interactive = isatty(STDIN_FILENO);
5260325f	142
2e73a022	143	if (stat(filename, &st) < 0) {
	144	perror(filename);
	145	exit(1);
	146	}
57112b5a	147	if (!interactive && getenv("DISPLAY")) {
	148	if (getenv(SSH_ASKPASS_ENV))
	149	askpass = getenv(SSH_ASKPASS_ENV);
	150	else
42f11eb2	151	askpass = _PATH_SSH_ASKPASS_DEFAULT;
57112b5a	152	}
aa3378df	153
5260325f	154	/* At first, try empty passphrase */
aeaa3d9e	155	private = key_load_private(filename, "", &comment);
	156	if (comment == NULL)
	157	comment = xstrdup(filename);
	158	if (private == NULL) {
aa3378df	159	printf("Need passphrase for %.200s\n", filename);
aa3378df	160	if (!interactive && askpass == NULL) {
aeaa3d9e	161	xfree(comment);
aa3378df	162	return;
5260325f	163	}
aeaa3d9e	164	snprintf(msg, sizeof msg, "Enter passphrase for %.200s", comment);
aa3378df	165	for (;;) {
aa3378df	166	if (interactive) {
	167	snprintf(buf, sizeof buf, "%s: ", msg);
	168	pass = read_passphrase(buf, 1);
	169	} else {
	170	pass = ssh_askpass(askpass, msg);
	171	}
5260325f	172	if (strcmp(pass, "") == 0) {
5260325f	173	xfree(pass);
aeaa3d9e	174	xfree(comment);
5260325f	175	return;
5260325f	176	}
aeaa3d9e	177	private = key_load_private(filename, pass, &comment);
5260325f	178	memset(pass, 0, strlen(pass));
5260325f	179	xfree(pass);
aeaa3d9e	180	if (private != NULL)
5260325f	181	break;
aa3378df	182	strlcpy(msg, "Bad passphrase, try again", sizeof msg);
5260325f	183	}
5260325f	184	}
aeaa3d9e	185	if (ssh_add_identity(ac, private, comment))
aeaa3d9e	186	fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
5260325f	187	else
5260325f	188	fprintf(stderr, "Could not add identity: %s\n", filename);
aeaa3d9e	189	xfree(comment);
a306f2dd	190	key_free(private);
8efc0c15	191	}
	192
	193	void
22138a36	194	list_identities(AuthenticationConnection *ac, int do_fp)
8efc0c15	195	{
2e73a022	196	Key *key;
22138a36	197	char comment, fp;
2e73a022	198	int had_identities = 0;
	199	int version;
	200
	201	for (version = 1; version <= 2; version++) {
	202	for (key = ssh_get_first_identity(ac, &comment, version);
	203	key != NULL;
	204	key = ssh_get_next_identity(ac, &comment, version)) {
	205	had_identities = 1;
22138a36	206	if (do_fp) {
	207	fp = key_fingerprint(key, SSH_FP_MD5,
	208	SSH_FP_HEX);
fa08c86b	209	printf("%d %s %s (%s)\n",
22138a36	210	key_size(key), fp, comment, key_type(key));
22138a36	211	xfree(fp);
5260325f	212	} else {
2e73a022	213	if (!key_write(key, stdout))
	214	fprintf(stderr, "key_write failed");
	215	fprintf(stdout, " %s\n", comment);
5260325f	216	}
2e73a022	217	key_free(key);
2e73a022	218	xfree(comment);
5260325f	219	}
f095fcc7	220	}
5260325f	221	if (!had_identities)
5260325f	222	printf("The agent has no identities.\n");
8efc0c15	223	}
	224
	225	int
5068f573	226	main(int argc, char **argv)
8efc0c15	227	{
5260325f	228	AuthenticationConnection *ac = NULL;
	229	struct passwd *pw;
	230	char buf[1024];
	231	int no_files = 1;
	232	int i;
	233	int deleting = 0;
	234
260d427b	235	__progname = get_progname(argv[0]);
264dce47	236	init_rng();
264dce47	237
2b87da3b	238	SSLeay_add_all_algorithms();
2e73a022	239
5260325f	240	/* At first, get a connection to the authentication agent. */
	241	ac = ssh_get_authentication_connection();
	242	if (ac == NULL) {
	243	fprintf(stderr, "Could not open a connection to your authentication agent.\n");
	244	exit(1);
8efc0c15	245	}
5260325f	246	for (i = 1; i < argc; i++) {
	247	if ((strcmp(argv[i], "-l") == 0) \|\|
	248	(strcmp(argv[i], "-L") == 0)) {
	249	list_identities(ac, argv[i][1] == 'l' ? 1 : 0);
	250	/* Don't default-add/delete if -l. */
	251	no_files = 0;
	252	continue;
	253	}
	254	if (strcmp(argv[i], "-d") == 0) {
	255	deleting = 1;
	256	continue;
	257	}
	258	if (strcmp(argv[i], "-D") == 0) {
	259	delete_all(ac);
	260	no_files = 0;
	261	continue;
	262	}
	263	no_files = 0;
	264	if (deleting)
	265	delete_file(ac, argv[i]);
	266	else
	267	add_file(ac, argv[i]);
8efc0c15	268	}
5260325f	269	if (no_files) {
	270	pw = getpwuid(getuid());
	271	if (!pw) {
14a9a859	272	fprintf(stderr, "No user found with uid %u\n",
14a9a859	273	(u_int)getuid());
5260325f	274	ssh_close_authentication_connection(ac);
	275	exit(1);
	276	}
42f11eb2	277	snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, _PATH_SSH_CLIENT_IDENTITY);
5260325f	278	if (deleting)
	279	delete_file(ac, buf);
	280	else
	281	add_file(ac, buf);
8efc0c15	282	}
5260325f	283	ssh_close_authentication_connection(ac);
5260325f	284	exit(0);
8efc0c15	285	}