+/* $OpenBSD: authfd.c,v 1.81 2009/08/27 17:44:52 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
*/
#include "includes.h"
-RCSID("$OpenBSD: authfd.c,v 1.32 2000/12/20 19:37:21 markus Exp $");
+#include <sys/types.h>
+#include <sys/un.h>
+#include <sys/socket.h>
+
+#include <openssl/evp.h>
+
+#include <openssl/crypto.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "xmalloc.h"
#include "ssh.h"
#include "rsa.h"
#include "buffer.h"
-#include "bufaux.h"
-#include "xmalloc.h"
-#include "getput.h"
-
-#include <openssl/rsa.h>
-#include <openssl/dsa.h>
-#include <openssl/evp.h>
#include "key.h"
#include "authfd.h"
+#include "cipher.h"
#include "kex.h"
#include "compat.h"
+#include "log.h"
+#include "atomicio.h"
+#include "misc.h"
+
+static int agent_present = 0;
/* helper */
int decode_reply(int type);
/* macro to check for "agent failure" message */
#define agent_failed(x) \
- ((x == SSH_AGENT_FAILURE) || (x == SSH_COM_AGENT2_FAILURE))
+ ((x == SSH_AGENT_FAILURE) || (x == SSH_COM_AGENT2_FAILURE) || \
+ (x == SSH2_AGENT_FAILURE))
+
+int
+ssh_agent_present(void)
+{
+ int authfd;
+
+ if (agent_present)
+ return 1;
+ if ((authfd = ssh_get_authentication_socket()) == -1)
+ return 0;
+ else {
+ ssh_close_authentication_socket(authfd);
+ return 1;
+ }
+}
/* Returns the number of the authentication fd, or -1 if there is none. */
ssh_get_authentication_socket(void)
{
const char *authsocket;
- int sock, len;
+ int sock;
struct sockaddr_un sunaddr;
authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME);
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)
close(sock);
return -1;
}
- if (connect(sock, (struct sockaddr *) & sunaddr, len) < 0) {
+ if (connect(sock, (struct sockaddr *)&sunaddr, sizeof sunaddr) < 0) {
close(sock);
return -1;
}
+ agent_present = 1;
return sock;
}
-int
+static int
ssh_request_reply(AuthenticationConnection *auth, Buffer *request, Buffer *reply)
{
- int l, len;
+ u_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);
+ put_u32(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),
+ if (atomicio(vwrite, auth->fd, buf, 4) != 4 ||
+ atomicio(vwrite, 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;
+ if (atomicio(read, auth->fd, buf, 4) != 4) {
+ error("Error reading response length from authentication socket.");
+ return 0;
}
/* Extract the length, and check it for sanity. */
- len = GET_32BIT(buf);
+ len = get_u32(buf);
if (len > 256 * 1024)
- fatal("Authentication response too long: %d", len);
+ fatal("Authentication response too long: %u", len);
/* Read the rest of the response in to the buffer. */
buffer_clear(reply);
l = len;
if (l > sizeof(buf))
l = sizeof(buf);
- l = read(auth->fd, buf, l);
- if (l <= 0) {
+ if (atomicio(read, auth->fd, buf, l) != l) {
error("Error reading response from authentication socket.");
return 0;
}
- buffer_append(reply, (char *) buf, l);
+ buffer_append(reply, buf, l);
len -= l;
}
return 1;
xfree(auth);
}
+/* Lock/unlock agent */
+int
+ssh_lock_agent(AuthenticationConnection *auth, int lock, const char *password)
+{
+ int type;
+ Buffer msg;
+
+ buffer_init(&msg);
+ buffer_put_char(&msg, lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK);
+ buffer_put_cstring(&msg, password);
+
+ if (ssh_request_reply(auth, &msg, &msg) == 0) {
+ buffer_free(&msg);
+ return 0;
+ }
+ type = buffer_get_char(&msg);
+ buffer_free(&msg);
+ return decode_reply(type);
+}
+
/*
* Returns the first authentication identity held by the agent.
*/
int type, code1 = 0, code2 = 0;
Buffer request;
- switch(version){
+ switch (version) {
case 1:
code1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES;
code2 = SSH_AGENT_RSA_IDENTITIES_ANSWER;
/* 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",
+ if ((u_int)auth->howmany > 1024)
+ fatal("Too many identities in authentication reply: %d",
auth->howmany);
return auth->howmany;
Key *
ssh_get_next_identity(AuthenticationConnection *auth, char **comment, int version)
{
+ int keybits;
u_int bits;
u_char *blob;
u_int blen;
* Get the next entry from the packet. These will abort with a fatal
* error if the packet is too short or contains corrupt data.
*/
- switch(version){
+ switch (version) {
case 1:
key = key_new(KEY_RSA1);
bits = buffer_get_int(&auth->identities);
buffer_get_bignum(&auth->identities, key->rsa->e);
buffer_get_bignum(&auth->identities, key->rsa->n);
*comment = buffer_get_string(&auth->identities, NULL);
- if (bits != BN_num_bits(key->rsa->n))
- log("Warning: identity keysize mismatch: actual %d, announced %u",
+ keybits = BN_num_bits(key->rsa->n);
+ if (keybits < 0 || bits != (u_int)keybits)
+ logit("Warning: identity keysize mismatch: actual %d, announced %u",
BN_num_bits(key->rsa->n), bits);
break;
case 2:
break;
default:
return NULL;
- break;
}
/* Decrement the number of remaining entries. */
auth->howmany--;
if (key->type != KEY_RSA1)
return 0;
if (response_type == 0) {
- log("Compatibility with ssh protocol version 1.0 no longer supported.");
+ logit("Compatibility with ssh protocol version 1.0 no longer supported.");
return 0;
}
buffer_init(&buffer);
buffer_put_bignum(&buffer, key->rsa->e);
buffer_put_bignum(&buffer, key->rsa->n);
buffer_put_bignum(&buffer, challenge);
- buffer_append(&buffer, (char *) session_id, 16);
+ buffer_append(&buffer, session_id, 16);
buffer_put_int(&buffer, response_type);
if (ssh_request_reply(auth, &buffer, &buffer) == 0) {
type = buffer_get_char(&buffer);
if (agent_failed(type)) {
- log("Agent admitted failure to authenticate using the key.");
+ logit("Agent admitted failure to authenticate using the key.");
} else if (type != SSH_AGENT_RSA_RESPONSE) {
fatal("Bad authentication response: %d", type);
} else {
* fatal error if the packet is corrupt.
*/
for (i = 0; i < 16; i++)
- response[i] = buffer_get_char(&buffer);
+ response[i] = (u_char)buffer_get_char(&buffer);
}
buffer_free(&buffer);
return success;
int
ssh_agent_sign(AuthenticationConnection *auth,
Key *key,
- u_char **sigp, int *lenp,
- u_char *data, int datalen)
+ u_char **sigp, u_int *lenp,
+ u_char *data, u_int datalen)
{
extern int datafellows;
Buffer msg;
}
type = buffer_get_char(&msg);
if (agent_failed(type)) {
- log("Agent admitted failure to sign using the key.");
+ logit("Agent admitted failure to sign using the key.");
} else if (type != SSH2_AGENT_SIGN_RESPONSE) {
fatal("Bad authentication response: %d", type);
} else {
/* Encode key for a message to the agent. */
-void
+static void
ssh_encode_identity_rsa1(Buffer *b, RSA *key, const char *comment)
{
- buffer_clear(b);
- buffer_put_char(b, SSH_AGENTC_ADD_RSA_IDENTITY);
buffer_put_int(b, BN_num_bits(key->n));
buffer_put_bignum(b, key->n);
buffer_put_bignum(b, key->e);
buffer_put_bignum(b, key->iqmp); /* ssh key->u */
buffer_put_bignum(b, key->q); /* ssh key->p, SSL key->q */
buffer_put_bignum(b, key->p); /* ssh key->q, SSL key->p */
- buffer_put_string(b, comment, strlen(comment));
+ buffer_put_cstring(b, comment);
}
-void
+static void
ssh_encode_identity_ssh2(Buffer *b, Key *key, const char *comment)
{
- buffer_clear(b);
- buffer_put_char(b, SSH2_AGENTC_ADD_IDENTITY);
buffer_put_cstring(b, key_ssh_name(key));
- switch(key->type){
+ switch (key->type) {
case KEY_RSA:
buffer_put_bignum2(b, key->rsa->n);
buffer_put_bignum2(b, key->rsa->e);
*/
int
-ssh_add_identity(AuthenticationConnection *auth, Key *key, const char *comment)
+ssh_add_identity_constrained(AuthenticationConnection *auth, Key *key,
+ const char *comment, u_int life, u_int confirm)
{
Buffer msg;
- int type;
+ int type, constrained = (life || confirm);
buffer_init(&msg);
switch (key->type) {
case KEY_RSA1:
+ type = constrained ?
+ SSH_AGENTC_ADD_RSA_ID_CONSTRAINED :
+ SSH_AGENTC_ADD_RSA_IDENTITY;
+ buffer_put_char(&msg, type);
ssh_encode_identity_rsa1(&msg, key->rsa, comment);
break;
case KEY_RSA:
case KEY_DSA:
+ type = constrained ?
+ SSH2_AGENTC_ADD_ID_CONSTRAINED :
+ SSH2_AGENTC_ADD_IDENTITY;
+ buffer_put_char(&msg, type);
ssh_encode_identity_ssh2(&msg, key, comment);
break;
default:
buffer_free(&msg);
return 0;
- break;
+ }
+ if (constrained) {
+ if (life != 0) {
+ buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME);
+ buffer_put_int(&msg, life);
+ }
+ if (confirm != 0)
+ buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM);
}
if (ssh_request_reply(auth, &msg, &msg) == 0) {
buffer_free(&msg);
return decode_reply(type);
}
+int
+ssh_update_card(AuthenticationConnection *auth, int add,
+ const char *reader_id, const char *pin, u_int life, u_int confirm)
+{
+ Buffer msg;
+ int type, constrained = (life || confirm);
+
+ if (add) {
+ type = constrained ?
+ SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED :
+ SSH_AGENTC_ADD_SMARTCARD_KEY;
+ } else
+ type = SSH_AGENTC_REMOVE_SMARTCARD_KEY;
+
+ buffer_init(&msg);
+ buffer_put_char(&msg, type);
+ buffer_put_cstring(&msg, reader_id);
+ buffer_put_cstring(&msg, pin);
+
+ if (constrained) {
+ if (life != 0) {
+ buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME);
+ buffer_put_int(&msg, life);
+ }
+ if (confirm != 0)
+ buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM);
+ }
+
+ if (ssh_request_reply(auth, &msg, &msg) == 0) {
+ buffer_free(&msg);
+ return 0;
+ }
+ type = buffer_get_char(&msg);
+ buffer_free(&msg);
+ return decode_reply(type);
+}
+
/*
* Removes all identities from the agent. This call is not meant to be used
* by normal applications.
return decode_reply(type);
}
-int
+int
decode_reply(int type)
{
switch (type) {
case SSH_AGENT_FAILURE:
case SSH_COM_AGENT2_FAILURE:
- log("SSH_AGENT_FAILURE");
+ case SSH2_AGENT_FAILURE:
+ logit("SSH_AGENT_FAILURE");
return 0;
case SSH_AGENT_SUCCESS:
return 1;
andersk / openssh.git / blobdiff