-/* $OpenBSD: ssh-agent.c,v 1.78 2002/01/13 17:27:07 provos Exp $ */
-
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
*/
#include "includes.h"
-#include <sys/queue.h>
-RCSID("$OpenBSD: ssh-agent.c,v 1.78 2002/01/13 17:27:07 provos Exp $");
+#include "openbsd-compat/fake-queue.h"
+RCSID("$OpenBSD: ssh-agent.c,v 1.95 2002/06/19 00:27:55 deraadt Exp $");
#include <openssl/evp.h>
#include <openssl/md5.h>
#include "buffer.h"
#include "bufaux.h"
#include "xmalloc.h"
-#include "packet.h"
#include "getput.h"
-#include "mpaux.h"
#include "key.h"
#include "authfd.h"
-#include "cipher.h"
-#include "kex.h"
#include "compat.h"
#include "log.h"
#ifdef SMARTCARD
-#include <openssl/engine.h>
#include "scard.h"
#endif
sock_type type;
Buffer input;
Buffer output;
+ Buffer request;
} SocketEntry;
u_int sockets_alloc = 0;
TAILQ_ENTRY(identity) next;
Key *key;
char *comment;
+ u_int death;
} Identity;
typedef struct {
char socket_name[1024];
char socket_dir[1024];
+/* locking */
+int locked = 0;
+char *lock_passwd = NULL;
+
#ifdef HAVE___PROGNAME
extern char *__progname;
#else
return &idtable[version];
}
+static void
+free_identity(Identity *id)
+{
+ key_free(id->key);
+ xfree(id->comment);
+ xfree(id);
+}
+
/* return matching private key for given public key */
static Identity *
lookup_identity(Key *key, int version)
return (NULL);
}
-static void
-free_identity(Identity *id)
-{
- key_free(id->key);
- xfree(id->comment);
- xfree(id);
-}
-
/* send list of supported public keys to 'client' */
static void
process_request_identities(SocketEntry *e, int version)
if ((challenge = BN_new()) == NULL)
fatal("process_authentication_challenge1: BN_new failed");
- buffer_get_int(&e->input); /* ignored */
- buffer_get_bignum(&e->input, key->rsa->e);
- buffer_get_bignum(&e->input, key->rsa->n);
- buffer_get_bignum(&e->input, challenge);
+ buffer_get_int(&e->request); /* ignored */
+ buffer_get_bignum(&e->request, key->rsa->e);
+ buffer_get_bignum(&e->request, key->rsa->n);
+ buffer_get_bignum(&e->request, challenge);
/* Only protocol 1.1 is supported */
- if (buffer_len(&e->input) == 0)
+ if (buffer_len(&e->request) == 0)
goto failure;
- buffer_get(&e->input, (char *) session_id, 16);
- response_type = buffer_get_int(&e->input);
+ buffer_get(&e->request, session_id, 16);
+ response_type = buffer_get_int(&e->request);
if (response_type != 1)
goto failure;
datafellows = 0;
- blob = buffer_get_string(&e->input, &blen);
- data = buffer_get_string(&e->input, &dlen);
+ blob = buffer_get_string(&e->request, &blen);
+ data = buffer_get_string(&e->request, &dlen);
- flags = buffer_get_int(&e->input);
+ flags = buffer_get_int(&e->request);
if (flags & SSH_AGENT_OLD_SIGNATURE)
datafellows = SSH_BUG_SIGBLOB;
switch (version) {
case 1:
key = key_new(KEY_RSA1);
- bits = buffer_get_int(&e->input);
- buffer_get_bignum(&e->input, key->rsa->e);
- buffer_get_bignum(&e->input, key->rsa->n);
+ bits = buffer_get_int(&e->request);
+ buffer_get_bignum(&e->request, key->rsa->e);
+ buffer_get_bignum(&e->request, key->rsa->n);
if (bits != key_size(key))
log("Warning: identity keysize mismatch: actual %d, announced %d",
key_size(key), bits);
break;
case 2:
- blob = buffer_get_string(&e->input, &blen);
+ blob = buffer_get_string(&e->request, &blen);
key = key_from_blob(blob, blen);
xfree(blob);
break;
/* Send success. */
buffer_put_int(&e->output, 1);
buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
- return;
+}
+
+static void
+reaper(void)
+{
+ Idtab *tab;
+ Identity *id, *nxt;
+ int version;
+ u_int now = time(NULL);
+
+ for (version = 1; version < 3; version++) {
+ tab = idtab_lookup(version);
+ for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
+ nxt = TAILQ_NEXT(id, next);
+ if (id->death != 0 && now >= id->death) {
+ TAILQ_REMOVE(&tab->idlist, id, next);
+ free_identity(id);
+ tab->nentries--;
+ }
+ }
+ }
}
static void
Key *k = NULL;
char *type_name;
char *comment;
- int type, success = 0;
+ int type, success = 0, death = 0;
Idtab *tab = idtab_lookup(version);
switch (version) {
case 1:
k = key_new_private(KEY_RSA1);
- buffer_get_int(&e->input); /* ignored */
- buffer_get_bignum(&e->input, k->rsa->n);
- buffer_get_bignum(&e->input, k->rsa->e);
- buffer_get_bignum(&e->input, k->rsa->d);
- buffer_get_bignum(&e->input, k->rsa->iqmp);
+ buffer_get_int(&e->request); /* ignored */
+ buffer_get_bignum(&e->request, k->rsa->n);
+ buffer_get_bignum(&e->request, k->rsa->e);
+ buffer_get_bignum(&e->request, k->rsa->d);
+ buffer_get_bignum(&e->request, k->rsa->iqmp);
/* SSH and SSL have p and q swapped */
- buffer_get_bignum(&e->input, k->rsa->q); /* p */
- buffer_get_bignum(&e->input, k->rsa->p); /* q */
+ buffer_get_bignum(&e->request, k->rsa->q); /* p */
+ buffer_get_bignum(&e->request, k->rsa->p); /* q */
/* Generate additional parameters */
rsa_generate_additional_parameters(k->rsa);
break;
case 2:
- type_name = buffer_get_string(&e->input, NULL);
+ type_name = buffer_get_string(&e->request, NULL);
type = key_type_from_name(type_name);
xfree(type_name);
switch (type) {
case KEY_DSA:
k = key_new_private(type);
- buffer_get_bignum2(&e->input, k->dsa->p);
- buffer_get_bignum2(&e->input, k->dsa->q);
- buffer_get_bignum2(&e->input, k->dsa->g);
- buffer_get_bignum2(&e->input, k->dsa->pub_key);
- buffer_get_bignum2(&e->input, k->dsa->priv_key);
+ buffer_get_bignum2(&e->request, k->dsa->p);
+ buffer_get_bignum2(&e->request, k->dsa->q);
+ buffer_get_bignum2(&e->request, k->dsa->g);
+ buffer_get_bignum2(&e->request, k->dsa->pub_key);
+ buffer_get_bignum2(&e->request, k->dsa->priv_key);
break;
case KEY_RSA:
k = key_new_private(type);
- buffer_get_bignum2(&e->input, k->rsa->n);
- buffer_get_bignum2(&e->input, k->rsa->e);
- buffer_get_bignum2(&e->input, k->rsa->d);
- buffer_get_bignum2(&e->input, k->rsa->iqmp);
- buffer_get_bignum2(&e->input, k->rsa->p);
- buffer_get_bignum2(&e->input, k->rsa->q);
+ buffer_get_bignum2(&e->request, k->rsa->n);
+ buffer_get_bignum2(&e->request, k->rsa->e);
+ buffer_get_bignum2(&e->request, k->rsa->d);
+ buffer_get_bignum2(&e->request, k->rsa->iqmp);
+ buffer_get_bignum2(&e->request, k->rsa->p);
+ buffer_get_bignum2(&e->request, k->rsa->q);
/* Generate additional parameters */
rsa_generate_additional_parameters(k->rsa);
break;
default:
- buffer_clear(&e->input);
+ buffer_clear(&e->request);
goto send;
}
break;
}
- comment = buffer_get_string(&e->input, NULL);
+ comment = buffer_get_string(&e->request, NULL);
if (k == NULL) {
xfree(comment);
goto send;
}
success = 1;
+ while (buffer_len(&e->request)) {
+ switch (buffer_get_char(&e->request)) {
+ case SSH_AGENT_CONSTRAIN_LIFETIME:
+ death = time(NULL) + buffer_get_int(&e->request);
+ break;
+ default:
+ break;
+ }
+ }
if (lookup_identity(k, version) == NULL) {
Identity *id = xmalloc(sizeof(Identity));
id->key = k;
id->comment = comment;
+ id->death = death;
TAILQ_INSERT_TAIL(&tab->idlist, id, next);
/* Increment the number of identities. */
tab->nentries++;
success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
}
+/* XXX todo: encrypt sensitive data with passphrase */
+static void
+process_lock_agent(SocketEntry *e, int lock)
+{
+ char *passwd;
+ int success = 0;
+
+ passwd = buffer_get_string(&e->request, NULL);
+ if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
+ locked = 0;
+ memset(lock_passwd, 0, strlen(lock_passwd));
+ xfree(lock_passwd);
+ lock_passwd = NULL;
+ success = 1;
+ } else if (!locked && lock) {
+ locked = 1;
+ lock_passwd = xstrdup(passwd);
+ success = 1;
+ }
+ memset(passwd, 0, strlen(passwd));
+ xfree(passwd);
+
+ buffer_put_int(&e->output, 1);
+ buffer_put_char(&e->output,
+ success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
+}
+
+static void
+no_identities(SocketEntry *e, u_int type)
+{
+ Buffer msg;
+
+ buffer_init(&msg);
+ buffer_put_char(&msg,
+ (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
+ SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
+ buffer_put_int(&msg, 0);
+ buffer_put_int(&e->output, buffer_len(&msg));
+ buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
+ buffer_free(&msg);
+}
#ifdef SMARTCARD
static void
process_add_smartcard_key (SocketEntry *e)
{
+ Identity *id;
Idtab *tab;
- Key *n = NULL, *k = NULL;
- char *sc_reader_id = NULL;
- int success = 0;
+ Key **keys, *k;
+ char *sc_reader_id = NULL, *pin;
+ int i, version, success = 0;
- sc_reader_id = buffer_get_string(&e->input, NULL);
- k = sc_get_key(sc_reader_id);
+ sc_reader_id = buffer_get_string(&e->request, NULL);
+ pin = buffer_get_string(&e->request, NULL);
+ keys = sc_get_keys(sc_reader_id, pin);
xfree(sc_reader_id);
+ xfree(pin);
- if (k == NULL) {
- error("sc_get_pubkey failed");
+ if (keys == NULL || keys[0] == NULL) {
+ error("sc_get_keys failed");
goto send;
}
- success = 1;
-
- tab = idtab_lookup(1);
- k->type = KEY_RSA1;
- if (lookup_identity(k, 1) == NULL) {
- Identity *id = xmalloc(sizeof(Identity));
- n = key_new(KEY_RSA1);
- BN_copy(n->rsa->n, k->rsa->n);
- BN_copy(n->rsa->e, k->rsa->e);
- RSA_set_method(n->rsa, sc_get_engine());
- id->key = n;
- id->comment = xstrdup("rsa1 smartcard");
- TAILQ_INSERT_TAIL(&tab->idlist, id, next);
- tab->nentries++;
- }
- k->type = KEY_RSA;
- tab = idtab_lookup(2);
- if (lookup_identity(k, 2) == NULL) {
- Identity *id = xmalloc(sizeof(Identity));
- n = key_new(KEY_RSA);
- BN_copy(n->rsa->n, k->rsa->n);
- BN_copy(n->rsa->e, k->rsa->e);
- RSA_set_method(n->rsa, sc_get_engine());
- id->key = n;
- id->comment = xstrdup("rsa smartcard");
- TAILQ_INSERT_TAIL(&tab->idlist, id, next);
- tab->nentries++;
+ for (i = 0; keys[i] != NULL; i++) {
+ k = keys[i];
+ version = k->type == KEY_RSA1 ? 1 : 2;
+ tab = idtab_lookup(version);
+ if (lookup_identity(k, version) == NULL) {
+ id = xmalloc(sizeof(Identity));
+ id->key = k;
+ id->comment = xstrdup("smartcard key");
+ id->death = 0;
+ TAILQ_INSERT_TAIL(&tab->idlist, id, next);
+ tab->nentries++;
+ success = 1;
+ } else {
+ key_free(k);
+ }
+ keys[i] = NULL;
}
- key_free(k);
+ xfree(keys);
send:
buffer_put_int(&e->output, 1);
buffer_put_char(&e->output,
static void
process_remove_smartcard_key(SocketEntry *e)
{
- Key *k = NULL;
- int success = 0;
- char *sc_reader_id = NULL;
+ Identity *id;
+ Idtab *tab;
+ Key **keys, *k = NULL;
+ char *sc_reader_id = NULL, *pin;
+ int i, version, success = 0;
- sc_reader_id = buffer_get_string(&e->input, NULL);
- k = sc_get_key(sc_reader_id);
+ sc_reader_id = buffer_get_string(&e->request, NULL);
+ pin = buffer_get_string(&e->request, NULL);
+ keys = sc_get_keys(sc_reader_id, pin);
xfree(sc_reader_id);
+ xfree(pin);
- if (k == NULL) {
- error("sc_get_pubkey failed");
- } else {
- Identity *id;
- k->type = KEY_RSA1;
- id = lookup_identity(k, 1);
- if (id != NULL) {
- Idtab *tab = idtab_lookup(1);
+ if (keys == NULL || keys[0] == NULL) {
+ error("sc_get_keys failed");
+ goto send;
+ }
+ for (i = 0; keys[i] != NULL; i++) {
+ k = keys[i];
+ version = k->type == KEY_RSA1 ? 1 : 2;
+ if ((id = lookup_identity(k, version)) != NULL) {
+ tab = idtab_lookup(version);
TAILQ_REMOVE(&tab->idlist, id, next);
- free_identity(id);
tab->nentries--;
- success = 1;
- }
- k->type = KEY_RSA;
- id = lookup_identity(k, 2);
- if (id != NULL) {
- Idtab *tab = idtab_lookup(2);
- TAILQ_REMOVE(&tab->idlist, id, next);
free_identity(id);
- tab->nentries--;
success = 1;
}
key_free(k);
+ keys[i] = NULL;
}
-
+ xfree(keys);
+send:
buffer_put_int(&e->output, 1);
buffer_put_char(&e->output,
success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
u_int msg_len;
u_int type;
u_char *cp;
+
+ /* kill dead keys */
+ reaper();
+
if (buffer_len(&e->input) < 5)
return; /* Incomplete message. */
cp = buffer_ptr(&e->input);
shutdown(e->fd, SHUT_RDWR);
close(e->fd);
e->type = AUTH_UNUSED;
+ buffer_free(&e->input);
+ buffer_free(&e->output);
+ buffer_free(&e->request);
return;
}
if (buffer_len(&e->input) < msg_len + 4)
return;
+
+ /* move the current input to e->request */
buffer_consume(&e->input, 4);
- type = buffer_get_char(&e->input);
+ buffer_clear(&e->request);
+ buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
+ buffer_consume(&e->input, msg_len);
+ type = buffer_get_char(&e->request);
+
+ /* check wheter agent is locked */
+ if (locked && type != SSH_AGENTC_UNLOCK) {
+ buffer_clear(&e->request);
+ switch (type) {
+ case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
+ case SSH2_AGENTC_REQUEST_IDENTITIES:
+ /* send empty lists */
+ no_identities(e, type);
+ break;
+ default:
+ /* send a fail message for all other request types */
+ buffer_put_int(&e->output, 1);
+ buffer_put_char(&e->output, SSH_AGENT_FAILURE);
+ }
+ return;
+ }
debug("type %d", type);
switch (type) {
+ case SSH_AGENTC_LOCK:
+ case SSH_AGENTC_UNLOCK:
+ process_lock_agent(e, type == SSH_AGENTC_LOCK);
+ break;
/* ssh1 */
case SSH_AGENTC_RSA_CHALLENGE:
process_authentication_challenge1(e);
process_request_identities(e, 1);
break;
case SSH_AGENTC_ADD_RSA_IDENTITY:
+ case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
process_add_identity(e, 1);
break;
case SSH_AGENTC_REMOVE_RSA_IDENTITY:
process_request_identities(e, 2);
break;
case SSH2_AGENTC_ADD_IDENTITY:
+ case SSH2_AGENTC_ADD_ID_CONSTRAINED:
process_add_identity(e, 2);
break;
case SSH2_AGENTC_REMOVE_IDENTITY:
default:
/* Unknown message. Respond with failure. */
error("Unknown message %d", type);
- buffer_clear(&e->input);
+ buffer_clear(&e->request);
buffer_put_int(&e->output, 1);
buffer_put_char(&e->output, SSH_AGENT_FAILURE);
break;
sockets[i].type = type;
buffer_init(&sockets[i].input);
buffer_init(&sockets[i].output);
+ buffer_init(&sockets[i].request);
return;
}
old_alloc = sockets_alloc;
sockets[old_alloc].fd = fd;
buffer_init(&sockets[old_alloc].input);
buffer_init(&sockets[old_alloc].output);
+ buffer_init(&sockets[old_alloc].request);
}
static int
sock = accept(sockets[i].fd,
(struct sockaddr *) &sunaddr, &slen);
if (sock < 0) {
- perror("accept from AUTH_SOCKET");
+ error("accept from AUTH_SOCKET: %s",
+ strerror(errno));
break;
}
new_socket(AUTH_CONNECTION, sock);
sockets[i].type = AUTH_UNUSED;
buffer_free(&sockets[i].input);
buffer_free(&sockets[i].output);
+ buffer_free(&sockets[i].request);
break;
}
buffer_consume(&sockets[i].output, len);
sockets[i].type = AUTH_UNUSED;
buffer_free(&sockets[i].input);
buffer_free(&sockets[i].output);
+ buffer_free(&sockets[i].request);
break;
}
buffer_append(&sockets[i].input, buf, len);
}
static void
-cleanup_socket(void)
+cleanup_socket(void *p)
{
if (socket_name[0])
unlink(socket_name);
static void
cleanup_exit(int i)
{
- cleanup_socket();
+ cleanup_socket(NULL);
exit(i);
}
static void
cleanup_handler(int sig)
{
- cleanup_socket();
+ cleanup_socket(NULL);
_exit(2);
}
fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
fprintf(stderr, " -k Kill the current agent.\n");
fprintf(stderr, " -d Debug mode.\n");
+ fprintf(stderr, " -a socket Bind agent socket to given name.\n");
exit(1);
}
#endif
pid_t pid;
char *shell, *format, *pidstr, pidstrbuf[1 + 3 * sizeof pid];
+ char *agentsocket = NULL;
extern int optind;
fd_set *readsetp = NULL, *writesetp = NULL;
init_rng();
seed_rng();
-#ifdef __GNU_LIBRARY__
- while ((ch = getopt(ac, av, "+cdks")) != -1) {
-#else /* __GNU_LIBRARY__ */
- while ((ch = getopt(ac, av, "cdks")) != -1) {
-#endif /* __GNU_LIBRARY__ */
+ while ((ch = getopt(ac, av, "cdksa:")) != -1) {
switch (ch) {
case 'c':
if (s_flag)
usage();
d_flag++;
break;
+ case 'a':
+ agentsocket = optarg;
+ break;
default:
usage();
}
if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
usage();
- if (ac == 0 && !c_flag && !k_flag && !s_flag && !d_flag) {
+ if (ac == 0 && !c_flag && !s_flag) {
shell = getenv("SHELL");
if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
c_flag = 1;
format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
printf(format, SSH_AUTHSOCKET_ENV_NAME);
printf(format, SSH_AGENTPID_ENV_NAME);
- printf("echo Agent pid %d killed;\n", pid);
+ printf("echo Agent pid %ld killed;\n", (long)pid);
exit(0);
}
parent_pid = getpid();
- /* Create private directory for agent socket */
- strlcpy(socket_dir, "/tmp/ssh-XXXXXXXX", sizeof socket_dir);
- if (mkdtemp(socket_dir) == NULL) {
- perror("mkdtemp: private socket dir");
- exit(1);
+ if (agentsocket == NULL) {
+ /* Create private directory for agent socket */
+ strlcpy(socket_dir, "/tmp/ssh-XXXXXXXX", sizeof socket_dir);
+ if (mkdtemp(socket_dir) == NULL) {
+ perror("mkdtemp: private socket dir");
+ exit(1);
+ }
+ snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
+ (long)parent_pid);
+ } else {
+ /* Try to use specified agent socket */
+ socket_dir[0] = '\0';
+ strlcpy(socket_name, agentsocket, sizeof socket_name);
}
- snprintf(socket_name, sizeof socket_name, "%s/agent.%d", socket_dir,
- parent_pid);
/*
* Create socket early so it will exist before command gets run from
format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
SSH_AUTHSOCKET_ENV_NAME);
- printf("echo Agent pid %d;\n", parent_pid);
+ printf("echo Agent pid %ld;\n", (long)parent_pid);
goto skip;
}
pid = fork();
if (pid == -1) {
perror("fork");
- exit(1);
+ cleanup_exit(1);
}
if (pid != 0) { /* Parent - execute the given command. */
close(sock);
- snprintf(pidstrbuf, sizeof pidstrbuf, "%d", pid);
+ snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
if (ac == 0) {
format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
SSH_AUTHSOCKET_ENV_NAME);
printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
SSH_AGENTPID_ENV_NAME);
- printf("echo Agent pid %d;\n", pid);
+ printf("echo Agent pid %ld;\n", (long)pid);
exit(0);
}
if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
perror(av[0]);
exit(1);
}
+ /* child */
+ log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
if (setsid() == -1) {
- perror("setsid");
+ error("setsid: %s", strerror(errno));
cleanup_exit(1);
}
/* deny core dumps, since memory contains unencrypted private keys */
rlim.rlim_cur = rlim.rlim_max = 0;
if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
- perror("setrlimit rlimit_core failed");
+ error("setrlimit RLIMIT_CORE: %s", strerror(errno));
cleanup_exit(1);
}
#endif
skip:
- if (atexit(cleanup_socket) < 0) {
- perror("atexit");
- cleanup_exit(1);
- }
+ fatal_add_cleanup(cleanup_socket, NULL);
new_socket(AUTH_SOCKET, sock);
if (ac > 0) {
signal(SIGALRM, check_parent_exists);
if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) {
if (errno == EINTR)
continue;
- exit(1);
+ fatal("select: %s", strerror(errno));
}
after_select(readsetp, writesetp);
}
andersk / openssh.git / blobdiff