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authorDamien Miller <djm@mindrot.org>2000-08-18 13:59:06 +1000
committerDamien Miller <djm@mindrot.org>2000-08-18 13:59:06 +1000
commit942da039d2a05e6f491883f50b516175a6dbb20f (patch)
tree0ac91ba19e494a3cb054d34db0c3b65660bd7375 /authfd.c
parent11fa2cc3839b1e7fed1d85aa1158cce4d498bc58 (diff)
- (djm) OpenBSD CVS changes:
- markus@cvs.openbsd.org 2000/07/22 03:14:37 [servconf.c servconf.h sshd.8 sshd.c sshd_config] random early drop; ok theo, niels - deraadt@cvs.openbsd.org 2000/07/26 11:46:51 [ssh.1] typo - deraadt@cvs.openbsd.org 2000/08/01 11:46:11 [sshd.8] many fixes from pepper@mail.reppep.com - provos@cvs.openbsd.org 2000/08/01 13:01:42 [Makefile.in util.c aux.c] rename aux.c to util.c to help with cygwin port - deraadt@cvs.openbsd.org 2000/08/02 00:23:31 [authfd.c] correct sun_len; Alexander@Leidinger.net - provos@cvs.openbsd.org 2000/08/02 10:27:17 [readconf.c sshd.8] disable kerberos authentication by default - provos@cvs.openbsd.org 2000/08/02 11:27:05 [sshd.8 readconf.c auth-krb4.c] disallow kerberos authentication if we can't verify the TGT; from dugsong@ kerberos authentication is on by default only if you have a srvtab. - markus@cvs.openbsd.org 2000/08/04 14:30:07 [auth.c] unused - markus@cvs.openbsd.org 2000/08/04 14:30:35 [sshd_config] MaxStartups - markus@cvs.openbsd.org 2000/08/15 13:20:46 [authfd.c] cleanup; ok niels@ - markus@cvs.openbsd.org 2000/08/17 14:05:10 [session.c] cleanup login(1)-like jobs, no duplicate utmp entries - markus@cvs.openbsd.org 2000/08/17 14:06:34 [session.c sshd.8 sshd.c] sshd -u len, similar to telnetd
Diffstat (limited to 'authfd.c')
-rw-r--r--authfd.c325
1 files changed, 121 insertions, 204 deletions
diff --git a/authfd.c b/authfd.c
index 227c9928..a34e111a 100644
--- a/authfd.c
+++ b/authfd.c
@@ -14,7 +14,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: authfd.c,v 1.22 2000/07/16 08:27:20 markus Exp $");
+RCSID("$OpenBSD: authfd.c,v 1.24 2000/08/15 19:20:46 markus Exp $");
#include "ssh.h"
#include "rsa.h"
@@ -31,7 +31,7 @@ RCSID("$OpenBSD: authfd.c,v 1.22 2000/07/16 08:27:20 markus Exp $");
#include "kex.h"
/* helper */
-int ssh_agent_get_reply(AuthenticationConnection *auth);
+int decode_reply(int type);
/* Returns the number of the authentication fd, or -1 if there is none. */
@@ -39,7 +39,7 @@ int
ssh_get_authentication_socket()
{
const char *authsocket;
- int sock;
+ int sock, len;
struct sockaddr_un sunaddr;
authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME);
@@ -48,6 +48,11 @@ ssh_get_authentication_socket()
sunaddr.sun_family = AF_UNIX;
strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path));
+#ifdef HAVE_SUN_LEN_IN_SOCKADDR_UN
+ sunaddr.sun_len = len = SUN_LEN(&sunaddr)+1;
+#else /* HAVE_SUN_LEN_IN_SOCKADDR_UN */
+ len = SUN_LEN(&sunaddr)+1;
+#endif /* HAVE_SUN_LEN_IN_SOCKADDR_UN */
sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock < 0)
@@ -58,13 +63,67 @@ ssh_get_authentication_socket()
close(sock);
return -1;
}
- if (connect(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) {
+ if (connect(sock, (struct sockaddr *) & sunaddr, len) < 0) {
close(sock);
return -1;
}
return sock;
}
+int
+ssh_request_reply(AuthenticationConnection *auth,
+ Buffer *request, Buffer *reply)
+{
+ int l, len;
+ char buf[1024];
+
+ /* Get the length of the message, and format it in the buffer. */
+ len = buffer_len(request);
+ PUT_32BIT(buf, len);
+
+ /* Send the length and then the packet to the agent. */
+ if (atomicio(write, auth->fd, buf, 4) != 4 ||
+ atomicio(write, auth->fd, buffer_ptr(request),
+ buffer_len(request)) != buffer_len(request)) {
+ error("Error writing to authentication socket.");
+ return 0;
+ }
+ /*
+ * Wait for response from the agent. First read the length of the
+ * response packet.
+ */
+ len = 4;
+ while (len > 0) {
+ l = read(auth->fd, buf + 4 - len, len);
+ if (l <= 0) {
+ error("Error reading response length from authentication socket.");
+ return 0;
+ }
+ len -= l;
+ }
+
+ /* Extract the length, and check it for sanity. */
+ len = GET_32BIT(buf);
+ if (len > 256 * 1024)
+ fatal("Authentication response too long: %d", len);
+
+ /* Read the rest of the response in to the buffer. */
+ buffer_clear(reply);
+ while (len > 0) {
+ l = len;
+ if (l > sizeof(buf))
+ l = sizeof(buf);
+ l = read(auth->fd, buf, l);
+ if (l <= 0) {
+ error("Error reading response from authentication socket.");
+ return 0;
+ }
+ buffer_append(reply, (char *) buf, l);
+ len -= l;
+ }
+ return 1;
+}
+
/*
* Closes the agent socket if it should be closed (depends on how it was
* obtained). The argument must have been returned by
@@ -133,62 +192,35 @@ ssh_close_authentication_connection(AuthenticationConnection *ac)
int
ssh_get_first_identity(AuthenticationConnection *auth,
- BIGNUM *e, BIGNUM *n, char **comment)
+ BIGNUM *e, BIGNUM *n, char **comment)
{
- unsigned char msg[8192];
- int len, l;
+ Buffer request;
+ int type;
/*
* Send a message to the agent requesting for a list of the
* identities it can represent.
*/
- PUT_32BIT(msg, 1);
- msg[4] = SSH_AGENTC_REQUEST_RSA_IDENTITIES;
- if (atomicio(write, auth->fd, msg, 5) != 5) {
- error("write auth->fd: %.100s", strerror(errno));
- return 0;
- }
- /* Read the length of the response. XXX implement timeouts here. */
- len = 4;
- while (len > 0) {
- l = read(auth->fd, msg + 4 - len, len);
- if (l <= 0) {
- error("read auth->fd: %.100s", strerror(errno));
- return 0;
- }
- len -= l;
- }
-
- /*
- * Extract the length, and check it for sanity. (We cannot trust
- * authentication agents).
- */
- len = GET_32BIT(msg);
- if (len < 1 || len > 256 * 1024)
- fatal("Authentication reply message too long: %d\n", len);
+ buffer_init(&request);
+ buffer_put_char(&request, SSH_AGENTC_REQUEST_RSA_IDENTITIES);
- /* Read the packet itself. */
buffer_clear(&auth->identities);
- while (len > 0) {
- l = len;
- if (l > sizeof(msg))
- l = sizeof(msg);
- l = read(auth->fd, msg, l);
- if (l <= 0)
- fatal("Incomplete authentication reply.");
- buffer_append(&auth->identities, (char *) msg, l);
- len -= l;
+ if (ssh_request_reply(auth, &request, &auth->identities) == 0) {
+ buffer_free(&request);
+ return 0;
}
+ buffer_free(&request);
/* Get message type, and verify that we got a proper answer. */
- buffer_get(&auth->identities, (char *) msg, 1);
- if (msg[0] != SSH_AGENT_RSA_IDENTITIES_ANSWER)
- fatal("Bad authentication reply message type: %d", msg[0]);
+ type = buffer_get_char(&auth->identities);
+ if (type != SSH_AGENT_RSA_IDENTITIES_ANSWER)
+ fatal("Bad authentication reply message type: %d", type);
/* Get the number of entries in the response and check it for sanity. */
auth->howmany = buffer_get_int(&auth->identities);
if (auth->howmany > 1024)
- fatal("Too many identities in authentication reply: %d\n", auth->howmany);
+ fatal("Too many identities in authentication reply: %d\n",
+ auth->howmany);
/* Return the first entry (if any). */
return ssh_get_next_identity(auth, e, n, comment);
@@ -203,7 +235,7 @@ ssh_get_first_identity(AuthenticationConnection *auth,
int
ssh_get_next_identity(AuthenticationConnection *auth,
- BIGNUM *e, BIGNUM *n, char **comment)
+ BIGNUM *e, BIGNUM *n, char **comment)
{
unsigned int bits;
@@ -240,23 +272,22 @@ ssh_get_next_identity(AuthenticationConnection *auth,
int
ssh_decrypt_challenge(AuthenticationConnection *auth,
- BIGNUM* e, BIGNUM *n, BIGNUM *challenge,
- unsigned char session_id[16],
- unsigned int response_type,
- unsigned char response[16])
+ BIGNUM* e, BIGNUM *n, BIGNUM *challenge,
+ unsigned char session_id[16],
+ unsigned int response_type,
+ unsigned char response[16])
{
Buffer buffer;
- unsigned char buf[8192];
- int len, l, i;
+ int success = 0;
+ int i;
+ int type;
- /* Response type 0 is no longer supported. */
if (response_type == 0)
- fatal("Compatibility with ssh protocol version 1.0 no longer supported.");
+ fatal("Compatibility with ssh protocol version "
+ "1.0 no longer supported.");
- /* Format a message to the agent. */
- buf[0] = SSH_AGENTC_RSA_CHALLENGE;
buffer_init(&buffer);
- buffer_append(&buffer, (char *) buf, 1);
+ buffer_put_char(&buffer, SSH_AGENTC_RSA_CHALLENGE);
buffer_put_int(&buffer, BN_num_bits(n));
buffer_put_bignum(&buffer, e);
buffer_put_bignum(&buffer, n);
@@ -264,77 +295,27 @@ ssh_decrypt_challenge(AuthenticationConnection *auth,
buffer_append(&buffer, (char *) session_id, 16);
buffer_put_int(&buffer, response_type);
- /* Get the length of the message, and format it in the buffer. */
- len = buffer_len(&buffer);
- PUT_32BIT(buf, len);
-
- /* Send the length and then the packet to the agent. */
- if (atomicio(write, auth->fd, buf, 4) != 4 ||
- atomicio(write, auth->fd, buffer_ptr(&buffer),
- buffer_len(&buffer)) != buffer_len(&buffer)) {
- error("Error writing to authentication socket.");
-error_cleanup:
+ if (ssh_request_reply(auth, &buffer, &buffer) == 0) {
buffer_free(&buffer);
return 0;
}
- /*
- * Wait for response from the agent. First read the length of the
- * response packet.
- */
- len = 4;
- while (len > 0) {
- l = read(auth->fd, buf + 4 - len, len);
- if (l <= 0) {
- error("Error reading response length from authentication socket.");
- goto error_cleanup;
- }
- len -= l;
- }
-
- /* Extract the length, and check it for sanity. */
- len = GET_32BIT(buf);
- if (len > 256 * 1024)
- fatal("Authentication response too long: %d", len);
-
- /* Read the rest of the response in tothe buffer. */
- buffer_clear(&buffer);
- while (len > 0) {
- l = len;
- if (l > sizeof(buf))
- l = sizeof(buf);
- l = read(auth->fd, buf, l);
- if (l <= 0) {
- error("Error reading response from authentication socket.");
- goto error_cleanup;
- }
- buffer_append(&buffer, (char *) buf, l);
- len -= l;
- }
-
- /* Get the type of the packet. */
- buffer_get(&buffer, (char *) buf, 1);
+ type = buffer_get_char(&buffer);
- /* Check for agent failure message. */
- if (buf[0] == SSH_AGENT_FAILURE) {
+ if (type == SSH_AGENT_FAILURE) {
log("Agent admitted failure to authenticate using the key.");
- goto error_cleanup;
+ } else if (type != SSH_AGENT_RSA_RESPONSE) {
+ fatal("Bad authentication response: %d", type);
+ } else {
+ success = 1;
+ /*
+ * Get the response from the packet. This will abort with a
+ * fatal error if the packet is corrupt.
+ */
+ for (i = 0; i < 16; i++)
+ response[i] = buffer_get_char(&buffer);
}
- /* Now it must be an authentication response packet. */
- if (buf[0] != SSH_AGENT_RSA_RESPONSE)
- fatal("Bad authentication response: %d", buf[0]);
-
- /*
- * Get the response from the packet. This will abort with a fatal
- * error if the packet is corrupt.
- */
- for (i = 0; i < 16; i++)
- response[i] = buffer_get_char(&buffer);
-
- /* The buffer containing the packet is no longer needed. */
buffer_free(&buffer);
-
- /* Correct answer. */
- return 1;
+ return success;
}
/* Encode key for a message to the agent. */
@@ -378,8 +359,7 @@ int
ssh_add_identity(AuthenticationConnection *auth, Key *key, const char *comment)
{
Buffer buffer;
- unsigned char buf[8192];
- int len;
+ int type;
buffer_init(&buffer);
@@ -395,21 +375,13 @@ ssh_add_identity(AuthenticationConnection *auth, Key *key, const char *comment)
return 0;
break;
}
-
- /* Get the length of the message, and format it in the buffer. */
- len = buffer_len(&buffer);
- PUT_32BIT(buf, len);
-
- /* Send the length and then the packet to the agent. */
- if (atomicio(write, auth->fd, buf, 4) != 4 ||
- atomicio(write, auth->fd, buffer_ptr(&buffer),
- buffer_len(&buffer)) != buffer_len(&buffer)) {
- error("Error writing to authentication socket.");
+ if (ssh_request_reply(auth, &buffer, &buffer) == 0) {
buffer_free(&buffer);
return 0;
}
+ type = buffer_get_char(&buffer);
buffer_free(&buffer);
- return ssh_agent_get_reply(auth);
+ return decode_reply(type);
}
/*
@@ -421,30 +393,21 @@ int
ssh_remove_identity(AuthenticationConnection *auth, RSA *key)
{
Buffer buffer;
- unsigned char buf[5];
- int len;
+ int type;
- /* Format a message to the agent. */
buffer_init(&buffer);
buffer_put_char(&buffer, SSH_AGENTC_REMOVE_RSA_IDENTITY);
buffer_put_int(&buffer, BN_num_bits(key->n));
buffer_put_bignum(&buffer, key->e);
buffer_put_bignum(&buffer, key->n);
- /* Get the length of the message, and format it in the buffer. */
- len = buffer_len(&buffer);
- PUT_32BIT(buf, len);
-
- /* Send the length and then the packet to the agent. */
- if (atomicio(write, auth->fd, buf, 4) != 4 ||
- atomicio(write, auth->fd, buffer_ptr(&buffer),
- buffer_len(&buffer)) != buffer_len(&buffer)) {
- error("Error writing to authentication socket.");
+ if (ssh_request_reply(auth, &buffer, &buffer) == 0) {
buffer_free(&buffer);
return 0;
}
+ type = buffer_get_char(&buffer);
buffer_free(&buffer);
- return ssh_agent_get_reply(auth);
+ return decode_reply(type);
}
/*
@@ -455,73 +418,27 @@ ssh_remove_identity(AuthenticationConnection *auth, RSA *key)
int
ssh_remove_all_identities(AuthenticationConnection *auth)
{
- unsigned char buf[5];
+ Buffer buffer;
+ int type;
- /* Get the length of the message, and format it in the buffer. */
- PUT_32BIT(buf, 1);
- buf[4] = SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES;
+ buffer_init(&buffer);
+ buffer_put_char(&buffer, SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES);
- /* Send the length and then the packet to the agent. */
- if (atomicio(write, auth->fd, buf, 5) != 5) {
- error("Error writing to authentication socket.");
+ if (ssh_request_reply(auth, &buffer, &buffer) == 0) {
+ buffer_free(&buffer);
return 0;
}
- return ssh_agent_get_reply(auth);
+ type = buffer_get_char(&buffer);
+ buffer_free(&buffer);
+ return decode_reply(type);
}
-/*
- * Read for reply from agent. returns 1 for success, 0 on error
- */
-
int
-ssh_agent_get_reply(AuthenticationConnection *auth)
+decode_reply(int type)
{
- Buffer buffer;
- unsigned char buf[8192];
- int len, l, type;
-
- /*
- * Wait for response from the agent. First read the length of the
- * response packet.
- */
- len = 4;
- while (len > 0) {
- l = read(auth->fd, buf + 4 - len, len);
- if (l <= 0) {
- error("Error reading response length from authentication socket.");
- buffer_free(&buffer);
- return 0;
- }
- len -= l;
- }
-
- /* Extract the length, and check it for sanity. */
- len = GET_32BIT(buf);
- if (len > 256 * 1024)
- fatal("Response from agent too long: %d", len);
-
- /* Read the rest of the response in to the buffer. */
- buffer_init(&buffer);
- while (len > 0) {
- l = len;
- if (l > sizeof(buf))
- l = sizeof(buf);
- l = read(auth->fd, buf, l);
- if (l <= 0) {
- error("Error reading response from authentication socket.");
- buffer_free(&buffer);
- return 0;
- }
- buffer_append(&buffer, (char *) buf, l);
- len -= l;
- }
-
- /* Get the type of the packet. */
- type = buffer_get_char(&buffer);
- buffer_free(&buffer);
switch (type) {
case SSH_AGENT_FAILURE:
-log("SSH_AGENT_FAILURE");
+ log("SSH_AGENT_FAILURE");
return 0;
case SSH_AGENT_SUCCESS:
return 1;