* Challenge Response Authentication Method using MD5 (CRAM-MD5)
*
* cram-md5 is based on RFC2104.
- *
+ *
* Written for Bacula by Kern E. Sibbald, May MMI.
*
* Version $Id$
*/
/*
- Copyright (C) 2000, 2001, 2002 Kern Sibbald and John Walker
+ Copyright (C) 2000-2006 Kern Sibbald
This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License as
- published by the Free Software Foundation; either version 2 of
- the License, or (at your option) any later version.
+ modify it under the terms of the GNU General Public License
+ version 2 as amended with additional clauses defined in the
+ file LICENSE in the main source directory.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public
- License along with this program; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- MA 02111-1307, USA.
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ the file LICENSE for additional details.
*/
#include "bacula.h"
-int cram_md5_auth(BSOCK *bs, char *password)
+/* Authorize other end
+ * Codes that tls_local_need and tls_remote_need can take:
+ * BNET_TLS_NONE I cannot do tls
+ * BNET_TLS_OK I can do tls, but it is not required on my end
+ * BNET_TLS_REQUIRED tls is required on my end
+ *
+ * Returns: false if authentication failed
+ * true if OK
+ */
+bool cram_md5_challenge(BSOCK *bs, char *password, int tls_local_need, int compatible)
{
struct timeval t1;
struct timeval t2;
struct timezone tz;
- int i, ok;
+ int i;
+ bool ok;
char chal[MAXSTRING];
char host[MAXSTRING];
uint8_t hmac[20];
gettimeofday(&t1, &tz);
- for (i=0; i<4; i++)
+ for (i=0; i<4; i++) {
gettimeofday(&t2, &tz);
+ }
srandom((t1.tv_sec&0xffff) * (t2.tv_usec&0xff));
- gethostname(host, sizeof(host));
- sprintf((char *)chal, "<%u.%u@%s>", (uint32_t)random(), (uint32_t)time(NULL), host);
- if (!bnet_fsend(bs, "auth cram-md5 %s\n", chal)) {
- return 0;
+ if (!gethostname(host, sizeof(host))) {
+ bstrncpy(host, my_name, sizeof(host));
}
- Dmsg1(99, "%s", bs->msg);
- if (bnet_wait_data(bs, 120) <= 0 || bnet_recv(bs) <= 0) {
- sleep(5);
- return 0;
+ /* Send challenge -- no hashing yet */
+ bsnprintf(chal, sizeof(chal), "<%u.%u@%s>", (uint32_t)random(), (uint32_t)time(NULL), host);
+ Dmsg2(50, "send: auth cram-md5 %s ssl=%d\n", chal, tls_local_need);
+ if (compatible) {
+ if (!bnet_fsend(bs, "auth cram-md5c %s ssl=%d\n", chal, tls_local_need)) {
+ Dmsg1(50, "Bnet send challenge error.\n", bnet_strerror(bs));
+ return false;
+ }
+ } else {
+ /* Old non-compatible system */
+ if (!bnet_fsend(bs, "auth cram-md5 %s ssl=%d\n", chal, tls_local_need)) {
+ Dmsg1(50, "Bnet send challenge error.\n", bnet_strerror(bs));
+ return false;
+ }
}
+
+ /* Read hashed response to challenge */
+ if (bnet_wait_data(bs, 180) <= 0 || bnet_recv(bs) <= 0) {
+ Dmsg1(50, "Bnet receive challenge response error.\n", bnet_strerror(bs));
+ bmicrosleep(5, 0);
+ return false;
+ }
+
+ /* Attempt to duplicate hash with our password */
hmac_md5((uint8_t *)chal, strlen(chal), (uint8_t *)password, strlen(password), hmac);
- bin_to_base64(host, (char *)hmac, 16);
+ bin_to_base64(host, sizeof(host), (char *)hmac, 16, compatible);
ok = strcmp(bs->msg, host) == 0;
if (ok) {
- Dmsg3(399, "Authenticate %s: wanted %s, got %s\n",
- ok ? "OK" : "NOT OK", host, bs->msg);
+ Dmsg1(50, "Authenticate OK %s\n", host);
} else {
- Dmsg3(99, "Authenticate %s: wanted %s, got %s\n",
- ok ? "OK" : "NOT OK", host, bs->msg);
+ Dmsg2(50, "Authenticate NOT OK: wanted %s, got %s\n", host, bs->msg);
}
if (ok) {
bnet_fsend(bs, "1000 OK auth\n");
} else {
- bnet_fsend(bs, "1999 No auth\n");
- sleep(5);
+ Dmsg1(50, "Auth failed PW: %s\n", password);
+ bnet_fsend(bs, _("1999 Authorization failed.\n"));
+ bmicrosleep(5, 0);
}
return ok;
}
-int cram_md5_get_auth(BSOCK *bs, char *password)
+/* Respond to challenge from other end */
+bool cram_md5_respond(BSOCK *bs, char *password, int *tls_remote_need, int *compatible)
{
char chal[MAXSTRING];
uint8_t hmac[20];
+ *compatible = false;
if (bnet_recv(bs) <= 0) {
- sleep(5);
- return 0;
+ bmicrosleep(5, 0);
+ return false;
}
- if (sscanf(bs->msg, "auth cram-md5 %s", chal) != 1) {
- sleep(5);
- return 0;
+ if (bs->msglen >= MAXSTRING) {
+ Dmsg1(50, "Msg too long wanted auth cram... Got: %s", bs->msg);
+ bmicrosleep(5, 0);
+ return false;
}
+ Dmsg1(100, "cram-get: %s", bs->msg);
+ if (sscanf(bs->msg, "auth cram-md5c %s ssl=%d", chal, tls_remote_need) == 2) {
+ *compatible = true;
+ } else if (sscanf(bs->msg, "auth cram-md5 %s ssl=%d", chal, tls_remote_need) != 2) {
+ if (sscanf(bs->msg, "auth cram-md5 %s\n", chal) != 1) {
+ Dmsg1(50, "Cannot scan challenge: %s", bs->msg);
+ bnet_fsend(bs, _("1999 Authorization failed.\n"));
+ bmicrosleep(5, 0);
+ return false;
+ }
+ }
+
hmac_md5((uint8_t *)chal, strlen(chal), (uint8_t *)password, strlen(password), hmac);
- bs->msglen = bin_to_base64(bs->msg, (char *)hmac, 16);
+ bs->msglen = bin_to_base64(bs->msg, 50, (char *)hmac, 16, *compatible) + 1;
+// Dmsg3(100, "get_auth: chal=%s pw=%s hmac=%s\n", chal, password, bs->msg);
if (!bnet_send(bs)) {
- return 0;
+ Dmsg1(50, "Send challenge failed. ERR=%s\n", bnet_strerror(bs));
+ return false;
}
Dmsg1(99, "sending resp to challenge: %s\n", bs->msg);
- if (bnet_wait_data(bs, 120) <= 0 || bnet_recv(bs) <= 0) {
- sleep(5);
- return 0;
+ if (bnet_wait_data(bs, 180) <= 0 || bnet_recv(bs) <= 0) {
+ Dmsg1(50, "Receive chanllenge response failed. ERR=%s\n", bnet_strerror(bs));
+ bmicrosleep(5, 0);
+ return false;
}
if (strcmp(bs->msg, "1000 OK auth\n") == 0) {
- return 1;
+ return true;
}
- sleep(5);
- return 0;
+ Dmsg1(50, "Bad auth response: %s\n", bs->msg);
+ bmicrosleep(5, 0);
+ return false;
}
projects / bacula / bacula / blobdiff