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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
* Created: Thu Apr 6 00:52:24 1995 ylo
* Adds an identity to the authentication server, or removes an identity.
*
* SSH2 implementation,
* Copyright (c) 2000 Markus Friedl. All rights reserved.
*/
#include "includes.h"
RCSID("$OpenBSD: ssh-add.c,v 1.19 2000/08/19 21:34:43 markus Exp $");
#include <openssl/evp.h>
#include <openssl/rsa.h>
#include <openssl/dsa.h>
#include "rsa.h"
#include "ssh.h"
#include "xmalloc.h"
#include "key.h"
#include "authfd.h"
#include "authfile.h"
void
delete_file(AuthenticationConnection *ac, const char *filename)
{
Key *public;
char *comment;
public = key_new(KEY_RSA);
if (!load_public_key(filename, public, &comment)) {
printf("Bad key file %s: %s\n", filename, strerror(errno));
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 identitities.\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 (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_RSA;
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_RSA);
if (!load_public_key(filename, public, &saved_comment)) {
/* ok, so we will asume this is a DSA key */
type = KEY_DSA;
saved_comment = xstrdup(filename);
}
key_free(public);
if (!interactive && getenv("DISPLAY")) {
if (getenv(SSH_ASKPASS_ENV))
askpass = getenv(SSH_ASKPASS_ENV);
else
askpass = 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\n",
key_size(key), key_fingerprint(key), comment);
} 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;
/* check if RSA support exists */
if (rsa_alive() == 0) {
extern char *__progname;
fprintf(stderr,
"%s: no RSA support in libssl and libcrypto. See ssl(8).\n",
__progname);
exit(1);
}
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 %d\n", (int) getuid());
ssh_close_authentication_connection(ac);
exit(1);
}
snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir, SSH_CLIENT_IDENTITY);
if (deleting)
delete_file(ac, buf);
else
add_file(ac, buf);
}
ssh_close_authentication_connection(ac);
exit(0);
}
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