-/* $OpenBSD: ssh-agent.c,v 1.16 1999/10/28 20:41:23 markus Exp $ */
+/* $OpenBSD: ssh-agent.c,v 1.27 2000/04/12 09:39:10 markus Exp $ */
/*
-
-ssh-agent.c
-
-Author: Tatu Ylonen <ylo@cs.hut.fi>
-
-Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- All rights reserved
-
-Created: Wed Mar 29 03:46:59 1995 ylo
-
-The authentication agent program.
-
-*/
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ * Created: Wed Mar 29 03:46:59 1995 ylo
+ * The authentication agent program.
+ */
#include "includes.h"
-RCSID("$OpenBSD: ssh-agent.c,v 1.17 1999/11/02 19:42:36 markus Exp $");
+RCSID("$OpenBSD: ssh-agent.c,v 1.27 2000/04/12 09:39:10 markus Exp $");
#include "ssh.h"
#include "rsa.h"
#include <ssl/md5.h>
#endif
-#ifdef HAVE___PROGNAME
-extern char *__progname;
-#else /* HAVE___PROGNAME */
-const char *__progname = "ssh-agent";
-#endif /* HAVE___PROGNAME */
-
-typedef struct
-{
- int fd;
- enum { AUTH_UNUSED, AUTH_SOCKET, AUTH_CONNECTION } type;
- Buffer input;
- Buffer output;
+typedef struct {
+ int fd;
+ enum {
+ AUTH_UNUSED, AUTH_SOCKET, AUTH_CONNECTION
+ } type;
+ Buffer input;
+ Buffer output;
} SocketEntry;
unsigned int sockets_alloc = 0;
SocketEntry *sockets = NULL;
-typedef struct
-{
- RSA *key;
- char *comment;
+typedef struct {
+ RSA *key;
+ char *comment;
} Identity;
unsigned int num_identities = 0;
char socket_name[1024];
char socket_dir[1024];
+#ifdef HAVE___PROGNAME
+extern char *__progname;
+#else /* HAVE___PROGNAME */
+const char *__progname = "ssh-agent";
+#endif /* HAVE___PROGNAME */
+
void
process_request_identity(SocketEntry *e)
{
- Buffer msg;
- int i;
-
- buffer_init(&msg);
- buffer_put_char(&msg, SSH_AGENT_RSA_IDENTITIES_ANSWER);
- buffer_put_int(&msg, num_identities);
- for (i = 0; i < num_identities; i++)
- {
- buffer_put_int(&msg, BN_num_bits(identities[i].key->n));
- buffer_put_bignum(&msg, identities[i].key->e);
- buffer_put_bignum(&msg, identities[i].key->n);
- buffer_put_string(&msg, identities[i].comment,
- strlen(identities[i].comment));
- }
- buffer_put_int(&e->output, buffer_len(&msg));
- buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
- buffer_free(&msg);
+ Buffer msg;
+ int i;
+
+ buffer_init(&msg);
+ buffer_put_char(&msg, SSH_AGENT_RSA_IDENTITIES_ANSWER);
+ buffer_put_int(&msg, num_identities);
+ for (i = 0; i < num_identities; i++) {
+ buffer_put_int(&msg, BN_num_bits(identities[i].key->n));
+ buffer_put_bignum(&msg, identities[i].key->e);
+ buffer_put_bignum(&msg, identities[i].key->n);
+ buffer_put_string(&msg, identities[i].comment,
+ strlen(identities[i].comment));
+ }
+ buffer_put_int(&e->output, buffer_len(&msg));
+ buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
+ buffer_free(&msg);
}
void
process_authentication_challenge(SocketEntry *e)
{
- int i, pub_bits, len;
- BIGNUM *pub_e, *pub_n, *challenge;
- Buffer msg;
- MD5_CTX md;
- unsigned char buf[32], mdbuf[16], session_id[16];
- unsigned int response_type;
-
- buffer_init(&msg);
- pub_e = BN_new();
- pub_n = BN_new();
- challenge = BN_new();
- pub_bits = buffer_get_int(&e->input);
- buffer_get_bignum(&e->input, pub_e);
- buffer_get_bignum(&e->input, pub_n);
- buffer_get_bignum(&e->input, challenge);
- if (buffer_len(&e->input) == 0)
- {
- /* Compatibility code for old servers. */
- memset(session_id, 0, 16);
- response_type = 0;
- }
- else
- {
- /* New code. */
- buffer_get(&e->input, (char *)session_id, 16);
- response_type = buffer_get_int(&e->input);
- }
- for (i = 0; i < num_identities; i++)
- if (pub_bits == BN_num_bits(identities[i].key->n) &&
- BN_cmp(pub_e, identities[i].key->e) == 0 &&
- BN_cmp(pub_n, identities[i].key->n) == 0)
- {
- /* Decrypt the challenge using the private key. */
- rsa_private_decrypt(challenge, challenge, identities[i].key);
-
- /* Compute the desired response. */
- switch (response_type)
- {
- case 0: /* As of protocol 1.0 */
- /* This response type is no longer supported. */
- log("Compatibility with ssh protocol 1.0 no longer supported.");
- buffer_put_char(&msg, SSH_AGENT_FAILURE);
- goto send;
-
- case 1: /* As of protocol 1.1 */
- /* The response is MD5 of decrypted challenge plus session id. */
- len = BN_num_bytes(challenge);
-
- if (len <= 0 || len > 32) {
- fatal("process_authentication_challenge: "
- "bad challenge length %d", len);
- }
-
- memset(buf, 0, 32);
- BN_bn2bin(challenge, buf + 32 - len);
- MD5_Init(&md);
- MD5_Update(&md, buf, 32);
- MD5_Update(&md, session_id, 16);
- MD5_Final(mdbuf, &md);
- break;
-
- default:
- fatal("process_authentication_challenge: bad response_type %d",
- response_type);
- break;
- }
-
- /* Send the response. */
- buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
- for (i = 0; i < 16; i++)
- buffer_put_char(&msg, mdbuf[i]);
-
- goto send;
- }
- /* Unknown identity. Send failure. */
- buffer_put_char(&msg, SSH_AGENT_FAILURE);
- send:
- buffer_put_int(&e->output, buffer_len(&msg));
- buffer_append(&e->output, buffer_ptr(&msg),
- buffer_len(&msg));
- buffer_free(&msg);
- BN_clear_free(pub_e);
- BN_clear_free(pub_n);
- BN_clear_free(challenge);
+ int i, pub_bits, len;
+ BIGNUM *pub_e, *pub_n, *challenge;
+ Buffer msg;
+ MD5_CTX md;
+ unsigned char buf[32], mdbuf[16], session_id[16];
+ unsigned int response_type;
+
+ buffer_init(&msg);
+ pub_e = BN_new();
+ pub_n = BN_new();
+ challenge = BN_new();
+ pub_bits = buffer_get_int(&e->input);
+ buffer_get_bignum(&e->input, pub_e);
+ buffer_get_bignum(&e->input, pub_n);
+ buffer_get_bignum(&e->input, challenge);
+ if (buffer_len(&e->input) == 0) {
+ /* Compatibility code for old servers. */
+ memset(session_id, 0, 16);
+ response_type = 0;
+ } else {
+ /* New code. */
+ buffer_get(&e->input, (char *) session_id, 16);
+ response_type = buffer_get_int(&e->input);
+ }
+ for (i = 0; i < num_identities; i++)
+ if (pub_bits == BN_num_bits(identities[i].key->n) &&
+ BN_cmp(pub_e, identities[i].key->e) == 0 &&
+ BN_cmp(pub_n, identities[i].key->n) == 0) {
+ /* Decrypt the challenge using the private key. */
+ rsa_private_decrypt(challenge, challenge, identities[i].key);
+
+ /* Compute the desired response. */
+ switch (response_type) {
+ case 0:/* As of protocol 1.0 */
+ /* This response type is no longer supported. */
+ log("Compatibility with ssh protocol 1.0 no longer supported.");
+ buffer_put_char(&msg, SSH_AGENT_FAILURE);
+ goto send;
+
+ case 1:/* As of protocol 1.1 */
+ /* The response is MD5 of decrypted challenge plus session id. */
+ len = BN_num_bytes(challenge);
+
+ if (len <= 0 || len > 32) {
+ fatal("process_authentication_challenge: "
+ "bad challenge length %d", len);
+ }
+ memset(buf, 0, 32);
+ BN_bn2bin(challenge, buf + 32 - len);
+ MD5_Init(&md);
+ MD5_Update(&md, buf, 32);
+ MD5_Update(&md, session_id, 16);
+ MD5_Final(mdbuf, &md);
+ break;
+
+ default:
+ fatal("process_authentication_challenge: bad response_type %d",
+ response_type);
+ break;
+ }
+
+ /* Send the response. */
+ buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
+ for (i = 0; i < 16; i++)
+ buffer_put_char(&msg, mdbuf[i]);
+
+ goto send;
+ }
+ /* Unknown identity. Send failure. */
+ buffer_put_char(&msg, SSH_AGENT_FAILURE);
+send:
+ buffer_put_int(&e->output, buffer_len(&msg));
+ buffer_append(&e->output, buffer_ptr(&msg),
+ buffer_len(&msg));
+ buffer_free(&msg);
+ BN_clear_free(pub_e);
+ BN_clear_free(pub_n);
+ BN_clear_free(challenge);
}
void
process_remove_identity(SocketEntry *e)
{
- unsigned int bits;
- unsigned int i;
- BIGNUM *dummy, *n;
-
- dummy = BN_new();
- n = BN_new();
-
- /* Get the key from the packet. */
- bits = buffer_get_int(&e->input);
- buffer_get_bignum(&e->input, dummy);
- buffer_get_bignum(&e->input, n);
-
- /* Check if we have the key. */
- for (i = 0; i < num_identities; i++)
- if (BN_cmp(identities[i].key->n, n) == 0)
- {
- /* We have this key. Free the old key. Since we don\'t want to leave
- empty slots in the middle of the array, we actually free the
- key there and copy data from the last entry. */
- RSA_free(identities[i].key);
- xfree(identities[i].comment);
- if (i < num_identities - 1)
- identities[i] = identities[num_identities - 1];
- num_identities--;
- BN_clear_free(dummy);
- BN_clear_free(n);
-
- /* Send success. */
+ unsigned int bits;
+ unsigned int i;
+ BIGNUM *dummy, *n;
+
+ dummy = BN_new();
+ n = BN_new();
+
+ /* Get the key from the packet. */
+ bits = buffer_get_int(&e->input);
+ buffer_get_bignum(&e->input, dummy);
+ buffer_get_bignum(&e->input, n);
+
+ if (bits != BN_num_bits(n))
+ error("Warning: identity keysize mismatch: actual %d, announced %d",
+ BN_num_bits(n), bits);
+
+ /* Check if we have the key. */
+ for (i = 0; i < num_identities; i++)
+ if (BN_cmp(identities[i].key->n, n) == 0) {
+ /*
+ * We have this key. Free the old key. Since we
+ * don\'t want to leave empty slots in the middle of
+ * the array, we actually free the key there and copy
+ * data from the last entry.
+ */
+ RSA_free(identities[i].key);
+ xfree(identities[i].comment);
+ if (i < num_identities - 1)
+ identities[i] = identities[num_identities - 1];
+ num_identities--;
+ BN_clear_free(dummy);
+ BN_clear_free(n);
+
+ /* Send success. */
+ buffer_put_int(&e->output, 1);
+ buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
+ return;
+ }
+ /* We did not have the key. */
+ BN_clear(dummy);
+ BN_clear(n);
+
+ /* Send failure. */
buffer_put_int(&e->output, 1);
- buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
- return;
- }
- /* We did not have the key. */
- BN_clear(dummy);
- BN_clear(n);
-
- /* Send failure. */
- buffer_put_int(&e->output, 1);
- buffer_put_char(&e->output, SSH_AGENT_FAILURE);
+ buffer_put_char(&e->output, SSH_AGENT_FAILURE);
}
-/* Removes all identities from the agent. */
-
+/*
+ * Removes all identities from the agent.
+ */
void
process_remove_all_identities(SocketEntry *e)
{
- unsigned int i;
-
- /* Loop over all identities and clear the keys. */
- for (i = 0; i < num_identities; i++)
- {
- RSA_free(identities[i].key);
- xfree(identities[i].comment);
- }
-
- /* Mark that there are no identities. */
- num_identities = 0;
-
- /* Send success. */
- buffer_put_int(&e->output, 1);
- buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
- return;
-}
+ unsigned int i;
-/* Adds an identity to the agent. */
+ /* Loop over all identities and clear the keys. */
+ for (i = 0; i < num_identities; i++) {
+ RSA_free(identities[i].key);
+ xfree(identities[i].comment);
+ }
-void
-process_add_identity(SocketEntry *e)
-{
- RSA *k;
- int i;
- BIGNUM *aux;
- BN_CTX *ctx;
-
- if (num_identities == 0)
- identities = xmalloc(sizeof(Identity));
- else
- identities = xrealloc(identities, (num_identities + 1) * sizeof(Identity));
-
- identities[num_identities].key = RSA_new();
- k = identities[num_identities].key;
- buffer_get_int(&e->input); /* bits */
- k->n = BN_new();
- buffer_get_bignum(&e->input, k->n);
- k->e = BN_new();
- buffer_get_bignum(&e->input, k->e);
- k->d = BN_new();
- buffer_get_bignum(&e->input, k->d);
- k->iqmp = BN_new();
- buffer_get_bignum(&e->input, k->iqmp);
- /* SSH and SSL have p and q swapped */
- k->q = BN_new();
- buffer_get_bignum(&e->input, k->q); /* p */
- k->p = BN_new();
- buffer_get_bignum(&e->input, k->p); /* q */
-
- /* Generate additional parameters */
- aux = BN_new();
- ctx = BN_CTX_new();
-
- BN_sub(aux, k->q, BN_value_one());
- k->dmq1 = BN_new();
- BN_mod(k->dmq1, k->d, aux, ctx);
-
- BN_sub(aux, k->p, BN_value_one());
- k->dmp1 = BN_new();
- BN_mod(k->dmp1, k->d, aux, ctx);
-
- BN_clear_free(aux);
- BN_CTX_free(ctx);
-
- identities[num_identities].comment = buffer_get_string(&e->input, NULL);
-
- /* Check if we already have the key. */
- for (i = 0; i < num_identities; i++)
- if (BN_cmp(identities[i].key->n, k->n) == 0)
- {
- /* We already have this key. Clear and free the new data and
- return success. */
- RSA_free(k);
- xfree(identities[num_identities].comment);
+ /* Mark that there are no identities. */
+ num_identities = 0;
/* Send success. */
buffer_put_int(&e->output, 1);
buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
return;
- }
-
- /* Increment the number of identities. */
- num_identities++;
-
- /* Send a success message. */
- buffer_put_int(&e->output, 1);
- buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
+}
+
+/*
+ * Adds an identity to the agent.
+ */
+void
+process_add_identity(SocketEntry *e)
+{
+ RSA *k;
+ int i;
+ BIGNUM *aux;
+ BN_CTX *ctx;
+
+ if (num_identities == 0)
+ identities = xmalloc(sizeof(Identity));
+ else
+ identities = xrealloc(identities, (num_identities + 1) * sizeof(Identity));
+
+ identities[num_identities].key = RSA_new();
+ k = identities[num_identities].key;
+ buffer_get_int(&e->input); /* bits */
+ k->n = BN_new();
+ buffer_get_bignum(&e->input, k->n);
+ k->e = BN_new();
+ buffer_get_bignum(&e->input, k->e);
+ k->d = BN_new();
+ buffer_get_bignum(&e->input, k->d);
+ k->iqmp = BN_new();
+ buffer_get_bignum(&e->input, k->iqmp);
+ /* SSH and SSL have p and q swapped */
+ k->q = BN_new();
+ buffer_get_bignum(&e->input, k->q); /* p */
+ k->p = BN_new();
+ buffer_get_bignum(&e->input, k->p); /* q */
+
+ /* Generate additional parameters */
+ aux = BN_new();
+ ctx = BN_CTX_new();
+
+ BN_sub(aux, k->q, BN_value_one());
+ k->dmq1 = BN_new();
+ BN_mod(k->dmq1, k->d, aux, ctx);
+
+ BN_sub(aux, k->p, BN_value_one());
+ k->dmp1 = BN_new();
+ BN_mod(k->dmp1, k->d, aux, ctx);
+
+ BN_clear_free(aux);
+ BN_CTX_free(ctx);
+
+ identities[num_identities].comment = buffer_get_string(&e->input, NULL);
+
+ /* Check if we already have the key. */
+ for (i = 0; i < num_identities; i++)
+ if (BN_cmp(identities[i].key->n, k->n) == 0) {
+ /*
+ * We already have this key. Clear and free the new
+ * data and return success.
+ */
+ RSA_free(k);
+ xfree(identities[num_identities].comment);
+
+ /* Send success. */
+ buffer_put_int(&e->output, 1);
+ buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
+ return;
+ }
+ /* Increment the number of identities. */
+ num_identities++;
+
+ /* Send a success message. */
+ buffer_put_int(&e->output, 1);
+ buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
}
void
process_message(SocketEntry *e)
{
- unsigned int msg_len;
- unsigned int type;
- unsigned char *cp;
- if (buffer_len(&e->input) < 5)
- return; /* Incomplete message. */
- cp = (unsigned char *)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;
- return;
- }
- if (buffer_len(&e->input) < msg_len + 4)
- return;
- buffer_consume(&e->input, 4);
- type = buffer_get_char(&e->input);
-
- switch (type)
- {
- case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
- process_request_identity(e);
- break;
- case SSH_AGENTC_RSA_CHALLENGE:
- process_authentication_challenge(e);
- break;
- case SSH_AGENTC_ADD_RSA_IDENTITY:
- process_add_identity(e);
- break;
- case SSH_AGENTC_REMOVE_RSA_IDENTITY:
- process_remove_identity(e);
- break;
- case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
- process_remove_all_identities(e);
- break;
- default:
- /* Unknown message. Respond with failure. */
- error("Unknown message %d", type);
- buffer_clear(&e->input);
- buffer_put_int(&e->output, 1);
- buffer_put_char(&e->output, SSH_AGENT_FAILURE);
- break;
- }
+ unsigned int msg_len;
+ unsigned int type;
+ unsigned char *cp;
+ if (buffer_len(&e->input) < 5)
+ return; /* Incomplete message. */
+ cp = (unsigned char *) 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;
+ return;
+ }
+ if (buffer_len(&e->input) < msg_len + 4)
+ return;
+ buffer_consume(&e->input, 4);
+ type = buffer_get_char(&e->input);
+
+ switch (type) {
+ case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
+ process_request_identity(e);
+ break;
+ case SSH_AGENTC_RSA_CHALLENGE:
+ process_authentication_challenge(e);
+ break;
+ case SSH_AGENTC_ADD_RSA_IDENTITY:
+ process_add_identity(e);
+ break;
+ case SSH_AGENTC_REMOVE_RSA_IDENTITY:
+ process_remove_identity(e);
+ break;
+ case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
+ process_remove_all_identities(e);
+ break;
+ default:
+ /* Unknown message. Respond with failure. */
+ error("Unknown message %d", type);
+ buffer_clear(&e->input);
+ buffer_put_int(&e->output, 1);
+ buffer_put_char(&e->output, SSH_AGENT_FAILURE);
+ break;
+ }
}
void
new_socket(int type, int fd)
{
- unsigned int i, old_alloc;
- if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
- error("fcntl O_NONBLOCK: %s", strerror(errno));
-
- if (fd > max_fd)
- max_fd = fd;
-
- for (i = 0; i < sockets_alloc; i++)
- if (sockets[i].type == AUTH_UNUSED)
- {
- sockets[i].fd = fd;
- sockets[i].type = type;
- buffer_init(&sockets[i].input);
- buffer_init(&sockets[i].output);
- return;
- }
- old_alloc = sockets_alloc;
- sockets_alloc += 10;
- if (sockets)
- sockets = xrealloc(sockets, sockets_alloc * sizeof(sockets[0]));
- else
- sockets = xmalloc(sockets_alloc * sizeof(sockets[0]));
- for (i = old_alloc; i < sockets_alloc; i++)
- sockets[i].type = AUTH_UNUSED;
- sockets[old_alloc].type = type;
- sockets[old_alloc].fd = fd;
- buffer_init(&sockets[old_alloc].input);
- buffer_init(&sockets[old_alloc].output);
+ unsigned int i, old_alloc;
+ if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
+ error("fcntl O_NONBLOCK: %s", strerror(errno));
+
+ if (fd > max_fd)
+ max_fd = fd;
+
+ for (i = 0; i < sockets_alloc; i++)
+ if (sockets[i].type == AUTH_UNUSED) {
+ sockets[i].fd = fd;
+ sockets[i].type = type;
+ buffer_init(&sockets[i].input);
+ buffer_init(&sockets[i].output);
+ return;
+ }
+ old_alloc = sockets_alloc;
+ sockets_alloc += 10;
+ if (sockets)
+ sockets = xrealloc(sockets, sockets_alloc * sizeof(sockets[0]));
+ else
+ sockets = xmalloc(sockets_alloc * sizeof(sockets[0]));
+ for (i = old_alloc; i < sockets_alloc; i++)
+ sockets[i].type = AUTH_UNUSED;
+ sockets[old_alloc].type = type;
+ sockets[old_alloc].fd = fd;
+ buffer_init(&sockets[old_alloc].input);
+ buffer_init(&sockets[old_alloc].output);
}
void
prepare_select(fd_set *readset, fd_set *writeset)
{
- unsigned int i;
- for (i = 0; i < sockets_alloc; i++)
- switch (sockets[i].type)
- {
- case AUTH_SOCKET:
- case AUTH_CONNECTION:
- FD_SET(sockets[i].fd, readset);
- if (buffer_len(&sockets[i].output) > 0)
- FD_SET(sockets[i].fd, writeset);
- break;
- case AUTH_UNUSED:
- break;
- default:
- fatal("Unknown socket type %d", sockets[i].type);
- break;
- }
+ unsigned int i;
+ for (i = 0; i < sockets_alloc; i++)
+ switch (sockets[i].type) {
+ case AUTH_SOCKET:
+ case AUTH_CONNECTION:
+ FD_SET(sockets[i].fd, readset);
+ if (buffer_len(&sockets[i].output) > 0)
+ FD_SET(sockets[i].fd, writeset);
+ break;
+ case AUTH_UNUSED:
+ break;
+ default:
+ fatal("Unknown socket type %d", sockets[i].type);
+ break;
+ }
}
-void after_select(fd_set *readset, fd_set *writeset)
+void
+after_select(fd_set *readset, fd_set *writeset)
{
- unsigned int i;
- int len, sock;
- char buf[1024];
- struct sockaddr_un sunaddr;
-
- for (i = 0; i < sockets_alloc; i++)
- switch (sockets[i].type)
- {
- case AUTH_UNUSED:
- break;
- case AUTH_SOCKET:
- if (FD_ISSET(sockets[i].fd, readset))
- {
- len = sizeof(sunaddr);
- sock = accept(sockets[i].fd, (struct sockaddr *)&sunaddr, &len);
- if (sock < 0)
- {
- perror("accept from AUTH_SOCKET");
- break;
- }
- new_socket(AUTH_CONNECTION, sock);
- }
- break;
- case AUTH_CONNECTION:
- if (buffer_len(&sockets[i].output) > 0 &&
- FD_ISSET(sockets[i].fd, writeset))
- {
- len = write(sockets[i].fd, buffer_ptr(&sockets[i].output),
- buffer_len(&sockets[i].output));
- if (len <= 0)
- {
- shutdown(sockets[i].fd, SHUT_RDWR);
- close(sockets[i].fd);
- sockets[i].type = AUTH_UNUSED;
- break;
- }
- buffer_consume(&sockets[i].output, len);
- }
- if (FD_ISSET(sockets[i].fd, readset))
- {
- len = read(sockets[i].fd, buf, sizeof(buf));
- if (len <= 0)
- {
- shutdown(sockets[i].fd, SHUT_RDWR);
- close(sockets[i].fd);
- sockets[i].type = AUTH_UNUSED;
- break;
- }
- buffer_append(&sockets[i].input, buf, len);
- process_message(&sockets[i]);
- }
- break;
- default:
- fatal("Unknown type %d", sockets[i].type);
- }
+ unsigned int i;
+ int len, sock;
+ socklen_t slen;
+ char buf[1024];
+ struct sockaddr_un sunaddr;
+
+ for (i = 0; i < sockets_alloc; i++)
+ switch (sockets[i].type) {
+ case AUTH_UNUSED:
+ break;
+ case AUTH_SOCKET:
+ if (FD_ISSET(sockets[i].fd, readset)) {
+ slen = sizeof(sunaddr);
+ sock = accept(sockets[i].fd, (struct sockaddr *) & sunaddr, &slen);
+ if (sock < 0) {
+ perror("accept from AUTH_SOCKET");
+ break;
+ }
+ new_socket(AUTH_CONNECTION, sock);
+ }
+ break;
+ case AUTH_CONNECTION:
+ if (buffer_len(&sockets[i].output) > 0 &&
+ FD_ISSET(sockets[i].fd, writeset)) {
+ len = write(sockets[i].fd, buffer_ptr(&sockets[i].output),
+ buffer_len(&sockets[i].output));
+ if (len <= 0) {
+ shutdown(sockets[i].fd, SHUT_RDWR);
+ close(sockets[i].fd);
+ sockets[i].type = AUTH_UNUSED;
+ break;
+ }
+ buffer_consume(&sockets[i].output, len);
+ }
+ if (FD_ISSET(sockets[i].fd, readset)) {
+ len = read(sockets[i].fd, buf, sizeof(buf));
+ if (len <= 0) {
+ shutdown(sockets[i].fd, SHUT_RDWR);
+ close(sockets[i].fd);
+ sockets[i].type = AUTH_UNUSED;
+ break;
+ }
+ buffer_append(&sockets[i].input, buf, len);
+ process_message(&sockets[i]);
+ }
+ break;
+ default:
+ fatal("Unknown type %d", sockets[i].type);
+ }
}
void
check_parent_exists(int sig)
{
- if (kill(parent_pid, 0) < 0)
- {
- /* printf("Parent has died - Authentication agent exiting.\n"); */
- exit(1);
- }
- signal(SIGALRM, check_parent_exists);
- alarm(10);
+ if (kill(parent_pid, 0) < 0) {
+ /* printf("Parent has died - Authentication agent exiting.\n"); */
+ exit(1);
+ }
+ signal(SIGALRM, check_parent_exists);
+ alarm(10);
}
void
cleanup_socket(void)
{
- remove(socket_name);
- rmdir(socket_dir);
+ remove(socket_name);
+ rmdir(socket_dir);
}
void
cleanup_exit(int i)
{
- cleanup_socket();
- exit(i);
+ cleanup_socket();
+ exit(i);
}
void
usage()
{
- fprintf(stderr, "ssh-agent version %s\n", SSH_VERSION);
- fprintf(stderr, "Usage: %s [-c | -s] [-k] [command {args...]]\n",
- __progname);
- exit(1);
+ fprintf(stderr, "ssh-agent version %s\n", SSH_VERSION);
+ fprintf(stderr, "Usage: %s [-c | -s] [-k] [command {args...]]\n",
+ __progname);
+ exit(1);
}
int
main(int ac, char **av)
{
- fd_set readset, writeset;
- int sock, c_flag = 0, k_flag = 0, s_flag = 0, ch;
- struct sockaddr_un sunaddr;
- pid_t pid;
- char *shell, *format, *pidstr, pidstrbuf[1 + 3 * sizeof pid];
-
- /* check if RSA support exists */
- if (rsa_alive() == 0) {
- fprintf(stderr,
- "%s: no RSA support in libssl and libcrypto. See ssl(8).\n",
- __progname);
- exit(1);
- }
-
-#if defined(__GNU_LIBRARY__)
- while ((ch = getopt(ac, av, "+cks")) != -1)
-#else
- while ((ch = getopt(ac, av, "cks")) != -1)
-#endif /* defined(__GNU_LIBRARY__) */
- {
- switch (ch)
- {
- case 'c':
- if (s_flag)
- usage();
- c_flag++;
- break;
- case 'k':
- k_flag++;
- break;
- case 's':
- if (c_flag)
- usage();
- s_flag++;
- break;
- default:
- usage();
+ fd_set readset, writeset;
+ int sock, c_flag = 0, k_flag = 0, s_flag = 0, ch;
+ struct sockaddr_un sunaddr;
+ pid_t pid;
+ char *shell, *format, *pidstr, pidstrbuf[1 + 3 * sizeof pid];
+
+ /* check if RSA support exists */
+ if (rsa_alive() == 0) {
+ fprintf(stderr,
+ "%s: no RSA support in libssl and libcrypto. See ssl(8).\n",
+ __progname);
+ exit(1);
}
- }
- ac -= optind;
- av += optind;
-
- if (ac > 0 && (c_flag || k_flag || s_flag))
- usage();
-
- if (ac == 0 && !c_flag && !k_flag && !s_flag)
- {
- shell = getenv("SHELL");
- if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
- c_flag = 1;
- }
-
- if (k_flag)
- {
- pidstr = getenv(SSH_AGENTPID_ENV_NAME);
- if (pidstr == NULL)
- {
- fprintf(stderr, "%s not set, cannot kill agent\n",
- SSH_AGENTPID_ENV_NAME);
- exit(1);
+ while ((ch = getopt(ac, av, "cks")) != -1) {
+ switch (ch) {
+ case 'c':
+ if (s_flag)
+ usage();
+ c_flag++;
+ break;
+ case 'k':
+ k_flag++;
+ break;
+ case 's':
+ if (c_flag)
+ usage();
+ s_flag++;
+ break;
+ default:
+ usage();
+ }
}
- pid = atoi(pidstr);
- if (pid < 1) /* XXX PID_MAX check too */
- {
- fprintf(stderr, "%s=\"%s\", which is not a good PID\n",
- SSH_AGENTPID_ENV_NAME, pidstr);
- exit(1);
+ ac -= optind;
+ av += optind;
+
+ if (ac > 0 && (c_flag || k_flag || s_flag))
+ usage();
+
+ if (ac == 0 && !c_flag && !k_flag && !s_flag) {
+ shell = getenv("SHELL");
+ if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
+ c_flag = 1;
}
- if (kill(pid, SIGTERM) == -1)
- {
- perror("kill");
- exit(1);
+ if (k_flag) {
+ pidstr = getenv(SSH_AGENTPID_ENV_NAME);
+ if (pidstr == NULL) {
+ fprintf(stderr, "%s not set, cannot kill agent\n",
+ SSH_AGENTPID_ENV_NAME);
+ exit(1);
+ }
+ pid = atoi(pidstr);
+ if (pid < 1) { /* XXX PID_MAX check too */
+ fprintf(stderr, "%s=\"%s\", which is not a good PID\n",
+ SSH_AGENTPID_ENV_NAME, pidstr);
+ exit(1);
+ }
+ if (kill(pid, SIGTERM) == -1) {
+ perror("kill");
+ exit(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);
+ exit(0);
}
- 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);
- 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);
- }
- 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
- the parent. */
- sock = socket(AF_UNIX, SOCK_STREAM, 0);
- if (sock < 0)
- {
- perror("socket");
- cleanup_exit(1);
- }
- memset(&sunaddr, 0, sizeof(sunaddr));
- sunaddr.sun_family = AF_UNIX;
- strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
- if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0)
- {
- perror("bind");
- cleanup_exit(1);
- }
- if (listen(sock, 5) < 0)
- {
- perror("listen");
- cleanup_exit(1);
- }
-
- /* Fork, and have the parent execute the command, if any, or present the
- socket data. The child continues as the authentication agent. */
- pid = fork();
- if (pid == -1)
- {
- perror("fork");
- exit(1);
- }
- if (pid != 0)
- { /* Parent - execute the given command. */
- close(sock);
- snprintf(pidstrbuf, sizeof pidstrbuf, "%d", 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);
- 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);
}
+ 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
+ * the parent.
+ */
+ sock = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (sock < 0) {
+ perror("socket");
+ cleanup_exit(1);
+ }
+ memset(&sunaddr, 0, sizeof(sunaddr));
+ sunaddr.sun_family = AF_UNIX;
+ strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
+ if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) {
+ perror("bind");
+ cleanup_exit(1);
+ }
+ if (listen(sock, 5) < 0) {
+ perror("listen");
+ cleanup_exit(1);
+ }
+ /*
+ * Fork, and have the parent execute the command, if any, or present
+ * the socket data. The child continues as the authentication agent.
+ */
+ pid = fork();
+ if (pid == -1) {
+ perror("fork");
+ exit(1);
+ }
+ if (pid != 0) { /* Parent - execute the given command. */
+ close(sock);
+ snprintf(pidstrbuf, sizeof pidstrbuf, "%d", 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);
+ exit(0);
+ }
+ setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1);
+ setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1);
+ execvp(av[0], av);
+ perror(av[0]);
+ exit(1);
+ }
+ close(0);
+ close(1);
+ close(2);
- setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1);
- setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1);
- execvp(av[0], av);
- perror(av[0]);
- exit(1);
- }
-
- close(0);
- close(1);
- close(2);
-
- if (setsid() == -1)
- {
- perror("setsid");
- cleanup_exit(1);
- }
-
- if (atexit(cleanup_socket) < 0)
- {
- perror("atexit");
- cleanup_exit(1);
- }
-
- new_socket(AUTH_SOCKET, sock);
- if (ac > 0)
- {
- signal(SIGALRM, check_parent_exists);
- alarm(10);
- }
-
- signal(SIGINT, SIG_IGN);
- signal(SIGPIPE, SIG_IGN);
- while (1)
- {
- FD_ZERO(&readset);
- FD_ZERO(&writeset);
- prepare_select(&readset, &writeset);
- if (select(max_fd + 1, &readset, &writeset, NULL, NULL) < 0)
- {
- if (errno == EINTR)
- continue;
- exit(1);
+ if (setsid() == -1) {
+ perror("setsid");
+ cleanup_exit(1);
+ }
+ if (atexit(cleanup_socket) < 0) {
+ perror("atexit");
+ cleanup_exit(1);
+ }
+ new_socket(AUTH_SOCKET, sock);
+ if (ac > 0) {
+ signal(SIGALRM, check_parent_exists);
+ alarm(10);
+ }
+ signal(SIGINT, SIG_IGN);
+ signal(SIGPIPE, SIG_IGN);
+ signal(SIGHUP, cleanup_exit);
+ signal(SIGTERM, cleanup_exit);
+ while (1) {
+ FD_ZERO(&readset);
+ FD_ZERO(&writeset);
+ prepare_select(&readset, &writeset);
+ if (select(max_fd + 1, &readset, &writeset, NULL, NULL) < 0) {
+ if (errno == EINTR)
+ continue;
+ exit(1);
+ }
+ after_select(&readset, &writeset);
}
- after_select(&readset, &writeset);
- }
- /*NOTREACHED*/
+ /* NOTREACHED */
}
andersk / openssh.git / blobdiff