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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 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 1.37 2001/05/02 16:41:20 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"
/* 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");
}
void
add_file(AuthenticationConnection *ac, const char *filename)
{
struct stat st;
Key *private;
char *comment = NULL;
char msg[1024];
if (stat(filename, &st) < 0) {
perror(filename);
exit(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();
printf("Need passphrase for %.200s\n", filename);
snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ",
comment);
for (;;) {
pass = read_passphrase(msg, 1);
if (strcmp(pass, "") == 0) {
clear_pass();
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;
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);
}
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