*/
#include "includes.h"
-#include "openbsd-compat/fake-queue.h"
-RCSID("$OpenBSD: ssh-agent.c,v 1.87 2002/06/05 16:48:54 markus Exp $");
+#include "openbsd-compat/sys-queue.h"
+RCSID("$OpenBSD: ssh-agent.c,v 1.103 2002/09/10 20:24:47 markus Exp $");
#include <openssl/evp.h>
#include <openssl/md5.h>
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
char *__progname;
#endif
+static void
+close_socket(SocketEntry *e)
+{
+ close(e->fd);
+ e->fd = -1;
+ e->type = AUTH_UNUSED;
+ buffer_free(&e->input);
+ buffer_free(&e->output);
+ buffer_free(&e->request);
+}
+
static void
idtab_init(void)
{
int i;
+
for (i = 0; i <=2; i++) {
TAILQ_INIT(&idtable[i].idlist);
idtable[i].nentries = 0;
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)
{
Idtab *tab = idtab_lookup(version);
- Buffer msg;
Identity *id;
+ Buffer msg;
buffer_init(&msg);
buffer_put_char(&msg, (version == 1) ?
static void
process_authentication_challenge1(SocketEntry *e)
{
- Identity *id;
- Key *key;
+ u_char buf[32], mdbuf[16], session_id[16];
+ u_int response_type;
BIGNUM *challenge;
+ Identity *id;
int i, len;
Buffer msg;
MD5_CTX md;
- u_char buf[32], mdbuf[16], session_id[16];
- u_int response_type;
+ Key *key;
buffer_init(&msg);
key = key_new(KEY_RSA1);
if ((challenge = BN_new()) == NULL)
fatal("process_authentication_challenge1: BN_new failed");
- buffer_get_int(&e->request); /* ignored */
+ (void) 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);
static void
process_sign_request2(SocketEntry *e)
{
- extern int datafellows;
- Key *key;
u_char *blob, *data, *signature = NULL;
u_int blen, dlen, slen = 0;
- int flags;
+ extern int datafellows;
+ int ok = -1, flags;
Buffer msg;
- int ok = -1;
+ Key *key;
datafellows = 0;
static void
process_remove_identity(SocketEntry *e, int version)
{
+ u_int blen, bits;
+ int success = 0;
Key *key = NULL;
u_char *blob;
- u_int blen;
- u_int bits;
- int success = 0;
switch (version) {
case 1:
buffer_get_bignum(&e->request, key->rsa->n);
if (bits != key_size(key))
- log("Warning: identity keysize mismatch: actual %d, announced %d",
+ log("Warning: identity keysize mismatch: actual %u, announced %u",
key_size(key), bits);
break;
case 2:
/* Send success. */
buffer_put_int(&e->output, 1);
buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
- return;
+}
+
+static void
+reaper(void)
+{
+ u_int now = time(NULL);
+ Identity *id, *nxt;
+ int version;
+ Idtab *tab;
+
+ 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
process_add_identity(SocketEntry *e, int version)
{
- Key *k = NULL;
- char *type_name;
- char *comment;
- int type, success = 0;
Idtab *tab = idtab_lookup(version);
+ int type, success = 0, death = 0;
+ char *type_name, *comment;
+ Key *k = NULL;
switch (version) {
case 1:
k = key_new_private(KEY_RSA1);
- buffer_get_int(&e->request); /* ignored */
+ (void) 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);
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)
+{
+ int success = 0;
+ char *passwd;
+
+ 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 **keys, *k;
char *sc_reader_id = NULL, *pin;
int i, version, success = 0;
+ Key **keys, *k;
+ Identity *id;
+ Idtab *tab;
sc_reader_id = buffer_get_string(&e->request, NULL);
pin = buffer_get_string(&e->request, 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;
static void
process_remove_smartcard_key(SocketEntry *e)
{
- Identity *id;
- Idtab *tab;
- Key **keys, *k = NULL;
char *sc_reader_id = NULL, *pin;
int i, version, success = 0;
+ Key **keys, *k = NULL;
+ Identity *id;
+ Idtab *tab;
sc_reader_id = buffer_get_string(&e->request, NULL);
pin = buffer_get_string(&e->request, NULL);
version = k->type == KEY_RSA1 ? 1 : 2;
if ((id = lookup_identity(k, version)) != NULL) {
tab = idtab_lookup(version);
- TAILQ_REMOVE(&tab->idlist, id, next);
+ TAILQ_REMOVE(&tab->idlist, id, next);
tab->nentries--;
free_identity(id);
success = 1;
static void
process_message(SocketEntry *e)
{
- u_int msg_len;
- u_int type;
+ u_int msg_len, type;
u_char *cp;
+
+ /* kill dead keys */
+ reaper();
+
if (buffer_len(&e->input) < 5)
return; /* Incomplete message. */
cp = buffer_ptr(&e->input);
msg_len = GET_32BIT(cp);
if (msg_len > 256 * 1024) {
- shutdown(e->fd, SHUT_RDWR);
- close(e->fd);
- e->type = AUTH_UNUSED;
- buffer_free(&e->input);
- buffer_free(&e->output);
- buffer_free(&e->request);
+ close_socket(e);
return;
}
if (buffer_len(&e->input) < msg_len + 4)
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:
new_socket(sock_type type, int fd)
{
u_int i, old_alloc;
+
if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
error("fcntl O_NONBLOCK: %s", strerror(errno));
static void
after_select(fd_set *readset, fd_set *writeset)
{
- u_int i;
- int len, sock;
+ struct sockaddr_un sunaddr;
socklen_t slen;
char buf[1024];
- struct sockaddr_un sunaddr;
+ int len, sock;
+ u_int i;
+ uid_t euid;
+ gid_t egid;
for (i = 0; i < sockets_alloc; i++)
switch (sockets[i].type) {
strerror(errno));
break;
}
+ if (getpeereid(sock, &euid, &egid) < 0) {
+ error("getpeereid %d failed: %s",
+ sock, strerror(errno));
+ close(sock);
+ break;
+ }
+ if (getuid() != euid) {
+ error("uid mismatch: "
+ "peer euid %d != uid %d",
+ (int) euid, (int) getuid());
+ close(sock);
+ break;
+ }
new_socket(AUTH_CONNECTION, sock);
}
break;
break;
} while (1);
if (len <= 0) {
- shutdown(sockets[i].fd, SHUT_RDWR);
- close(sockets[i].fd);
- sockets[i].type = AUTH_UNUSED;
- buffer_free(&sockets[i].input);
- buffer_free(&sockets[i].output);
- buffer_free(&sockets[i].request);
+ close_socket(&sockets[i]);
break;
}
buffer_consume(&sockets[i].output, len);
break;
} while (1);
if (len <= 0) {
- shutdown(sockets[i].fd, SHUT_RDWR);
- close(sockets[i].fd);
- sockets[i].type = AUTH_UNUSED;
- buffer_free(&sockets[i].input);
- buffer_free(&sockets[i].output);
- buffer_free(&sockets[i].request);
+ close_socket(&sockets[i]);
break;
}
buffer_append(&sockets[i].input, buf, len);
main(int ac, char **av)
{
int sock, c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0, ch, nalloc;
+ char *shell, *format, *pidstr, *agentsocket = NULL;
+ fd_set *readsetp = NULL, *writesetp = NULL;
struct sockaddr_un sunaddr;
#ifdef HAVE_SETRLIMIT
struct rlimit rlim;
#ifdef HAVE_CYGWIN
int prev_mask;
#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;
+ extern char *optarg;
+ pid_t pid;
+ char pidstrbuf[1 + 3 * sizeof pid];
+
+ /* drop */
+ setegid(getgid());
+ setgid(getgid());
SSLeay_add_all_algorithms();
init_rng();
seed_rng();
-#ifdef __GNU_LIBRARY__
- while ((ch = getopt(ac, av, "+cdksa:")) != -1) {
-#else /* __GNU_LIBRARY__ */
while ((ch = getopt(ac, av, "cdksa:")) != -1) {
-#endif /* __GNU_LIBRARY__ */
switch (ch) {
case 'c':
if (s_flag)
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();
perror("mkdtemp: private socket dir");
exit(1);
}
- snprintf(socket_name, sizeof socket_name, "%s/agent.%d", socket_dir,
- parent_pid);
+ 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';
#ifdef HAVE_CYGWIN
umask(prev_mask);
#endif
- if (listen(sock, 5) < 0) {
+ if (listen(sock, 128) < 0) {
perror("listen");
cleanup_exit(1);
}
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 != 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 ||
andersk / openssh.git / blobdiff