2 Bacula® - The Network Backup Solution
4 Copyright (C) 2001-2011 Free Software Foundation Europe e.V.
6 The main author of Bacula is Kern Sibbald, with contributions from
7 many others, a complete list can be found in the file AUTHORS.
8 This program is Free Software; you can redistribute it and/or
9 modify it under the terms of version three of the GNU Affero General Public
10 License as published by the Free Software Foundation and included
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU Affero General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 Bacula® is a registered trademark of Kern Sibbald.
24 The licensor of Bacula is the Free Software Foundation Europe
25 (FSFE), Fiduciary Program, Sumatrastrasse 25, 8006 Zürich,
26 Switzerland, email:ftf@fsfeurope.org.
29 * Challenge Response Authentication Method using MD5 (CRAM-MD5)
31 * cram-md5 is based on RFC2104.
33 * Written for Bacula by Kern E. Sibbald, May MMI.
39 const int dbglvl = 50;
41 /* Authorize other end
42 * Codes that tls_local_need and tls_remote_need can take:
43 * BNET_TLS_NONE I cannot do tls
44 * BNET_TLS_OK I can do tls, but it is not required on my end
45 * BNET_TLS_REQUIRED tls is required on my end
47 * Returns: false if authentication failed
50 bool cram_md5_challenge(BSOCK *bs, const char *password, int tls_local_need, int compatible)
61 gettimeofday(&t1, &tz);
63 gettimeofday(&t2, &tz);
65 srandom((t1.tv_sec&0xffff) * (t2.tv_usec&0xff));
66 if (!gethostname(host, sizeof(host))) {
67 bstrncpy(host, my_name, sizeof(host));
69 /* Send challenge -- no hashing yet */
70 bsnprintf(chal, sizeof(chal), "<%u.%u@%s>", (uint32_t)random(), (uint32_t)time(NULL), host);
72 Dmsg2(dbglvl, "send: auth cram-md5 %s ssl=%d\n", chal, tls_local_need);
73 if (!bs->fsend("auth cram-md5 %s ssl=%d\n", chal, tls_local_need)) {
74 Dmsg1(dbglvl, "Bnet send challenge comm error. ERR=%s\n", bs->bstrerror());
78 /* Old non-compatible system */
79 Dmsg2(dbglvl, "send: auth cram-md5 %s ssl=%d\n", chal, tls_local_need);
80 if (!bs->fsend("auth cram-md5 %s ssl=%d\n", chal, tls_local_need)) {
81 Dmsg1(dbglvl, "Bnet send challenge comm error. ERR=%s\n", bs->bstrerror());
86 /* Read hashed response to challenge */
87 if (bs->wait_data(180) <= 0 || bs->recv() <= 0) {
88 Dmsg1(dbglvl, "Bnet receive challenge response comm error. ERR=%s\n", bs->bstrerror());
93 /* Attempt to duplicate hash with our password */
94 hmac_md5((uint8_t *)chal, strlen(chal), (uint8_t *)password, strlen(password), hmac);
95 bin_to_base64(host, sizeof(host), (char *)hmac, 16, compatible);
96 ok = strcmp(bs->msg, host) == 0;
98 Dmsg1(dbglvl, "Authenticate OK %s\n", host);
100 bin_to_base64(host, sizeof(host), (char *)hmac, 16, false);
101 ok = strcmp(bs->msg, host) == 0;
103 Dmsg2(dbglvl, "Authenticate NOT OK: wanted %s, got %s\n", host, bs->msg);
107 bs->fsend("1000 OK auth\n");
109 bs->fsend(_("1999 Authorization failed.\n"));
115 /* Respond to challenge from other end */
116 bool cram_md5_respond(BSOCK *bs, const char *password, int *tls_remote_need, int *compatible)
118 char chal[MAXSTRING];
122 if (bs->recv() <= 0) {
126 if (bs->msglen >= MAXSTRING) {
127 Dmsg1(dbglvl, "Msg too long wanted auth cram... Got: %s", bs->msg);
131 Dmsg1(100, "cram-get received: %s", bs->msg);
132 if (sscanf(bs->msg, "auth cram-md5c %s ssl=%d", chal, tls_remote_need) == 2) {
134 } else if (sscanf(bs->msg, "auth cram-md5 %s ssl=%d", chal, tls_remote_need) != 2) {
135 if (sscanf(bs->msg, "auth cram-md5 %s\n", chal) != 1) {
136 Dmsg1(dbglvl, "Cannot scan challenge: %s", bs->msg);
137 bs->fsend(_("1999 Authorization failed.\n"));
143 hmac_md5((uint8_t *)chal, strlen(chal), (uint8_t *)password, strlen(password), hmac);
144 bs->msglen = bin_to_base64(bs->msg, 50, (char *)hmac, 16, *compatible) + 1;
145 // Dmsg3(100, "get_auth: chal=%s pw=%s hmac=%s\n", chal, password, bs->msg);
147 Dmsg1(dbglvl, "Send challenge failed. ERR=%s\n", bs->bstrerror());
150 Dmsg1(99, "sending resp to challenge: %s\n", bs->msg);
151 if (bs->wait_data(180) <= 0 || bs->recv() <= 0) {
152 Dmsg1(dbglvl, "Receive chanllenge response failed. ERR=%s\n", bs->bstrerror());
156 if (strcmp(bs->msg, "1000 OK auth\n") == 0) {
159 Dmsg1(dbglvl, "Received bad response: %s\n", bs->msg);