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/*
* 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.
*/
#include "includes.h"
RCSID("$OpenBSD: ssh-add.c,v 1.64 2002/11/21 23:03:51 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"
#include "misc.h"
#ifdef HAVE___PROGNAME
extern char *__progname;
#else
char *__progname;
#endif
/* argv0 */
extern char *__progname;
/* Default files to add */
static char *default_files[] = {
_PATH_SSH_CLIENT_ID_RSA,
_PATH_SSH_CLIENT_ID_DSA,
_PATH_SSH_CLIENT_IDENTITY,
NULL
};
/* Default lifetime (0 == forever) */
static int lifetime = 0;
/* 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;
}
}
static int
delete_file(AuthenticationConnection *ac, const char *filename)
{
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;
}
/* Send a request to remove all identities. */
static int
delete_all(AuthenticationConnection *ac)
{
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;
}
static int
add_file(AuthenticationConnection *ac, const char *filename)
{
struct stat st;
Key *private;
char *comment = NULL;
char msg[1024];
int ret = -1;
if (stat(filename, &st) < 0) {
perror(filename);
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();
strlcpy(msg, "Bad passphrase, try again: ", sizeof msg);
}
}
if (ssh_add_identity_constrained(ac, private, comment, lifetime)) {
fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
ret = 0;
if (lifetime != 0)
fprintf(stderr,
"Lifetime set to %d seconds\n", lifetime);
} else if (ssh_add_identity(ac, private, comment)) {
fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
ret = 0;
} 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;
pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN);
if (pin == NULL)
return -1;
if (ssh_update_card(ac, add, id, pin)) {
fprintf(stderr, "Card %s: %s\n",
add ? "added" : "removed", id);
return 0;
} else {
fprintf(stderr, "Could not %s card: %s\n",
add ? "add" : "remove", id);
return -1;
}
}
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 (!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;
}
memset(p2, 0, strlen(p2));
xfree(p2);
}
if (passok && ssh_lock_agent(ac, lock, p1))
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