1 /* $Cambridge: exim/src/src/auths/pwcheck.c,v 1.4 2006/10/16 10:37:19 ph10 Exp $ */
3 /* SASL server API implementation
6 * $Id: checkpw.c,v 1.49 2002/03/07 19:14:04 ken3 Exp $
9 * Copyright (c) 2001 Carnegie Mellon University. All rights reserved.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in
20 * the documentation and/or other materials provided with the
23 * 3. The name "Carnegie Mellon University" must not be used to
24 * endorse or promote products derived from this software without
25 * prior written permission. For permission or any other legal
26 * details, please contact
27 * Office of Technology Transfer
28 * Carnegie Mellon University
30 * Pittsburgh, PA 15213-3890
31 * (412) 268-4387, fax: (412) 268-7395
32 * tech-transfer@andrew.cmu.edu
34 * 4. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by Computing Services
37 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
39 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
40 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
41 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
42 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
43 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
44 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
45 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
49 * Taken from Cyrus-SASL library and adapted by Alexander S. Sabourenkov
50 * Oct 2001 - Apr 2002: Slightly modified by Philip Hazel.
51 * Aug 2003: new code for saslauthd from Alexander S. Sabourenkov incorporated
52 * by Philip Hazel (minor mods to avoid compiler warnings)
53 * Oct 2006: (PH) removed redundant tests on "reply" being NULL - some were
54 * missing, and confused someone who was using this code for some
55 * other purpose. Here in Exim, "reply" is never NULL.
57 * screwdriver@lxnt.info
61 /* Originally this module supported only the pwcheck daemon, which is where its
62 name comes from. Nowadays it supports saslauthd as well; pwcheck is in fact
63 deprecated. The definitions of CYRUS_PWCHECK_SOCKET and CYRUS_SASLAUTHD_SOCKET
64 determine whether the facilities are actually supported or not. */
71 #if defined(CYRUS_PWCHECK_SOCKET) || defined(CYRUS_SASLAUTHD_SOCKET)
75 static int retry_read(int, void *, unsigned );
76 static int retry_writev(int, struct iovec
*, int );
77 static int read_string(int, uschar
**);
78 static int write_string(int, const uschar
*, int);
83 /* A dummy function that always fails if pwcheck support is not
86 #ifndef CYRUS_PWCHECK_SOCKET
87 int pwcheck_verify_password(const char *userid
,
91 userid
= userid
; /* Keep picky compilers happy */
93 *reply
= "pwcheck support is not included in this Exim binary";
98 /* This is the real function */
102 /* taken from cyrus-sasl file checkpw.c */
103 /* pwcheck daemon-authenticated login */
104 int pwcheck_verify_password(const char *userid
,
109 struct sockaddr_un srvaddr
;
111 static char response
[1024];
115 s
= socket(AF_UNIX
, SOCK_STREAM
, 0);
116 if (s
== -1) { return PWCHECK_FAIL
; }
118 memset((char *)&srvaddr
, 0, sizeof(srvaddr
));
119 srvaddr
.sun_family
= AF_UNIX
;
120 strncpy(srvaddr
.sun_path
, CYRUS_PWCHECK_SOCKET
, sizeof(srvaddr
.sun_path
));
121 r
= connect(s
, (struct sockaddr
*)&srvaddr
, sizeof(srvaddr
));
124 debug_printf("Cannot connect to pwcheck daemon (at '%s')\n",CYRUS_PWCHECK_SOCKET
);
125 *reply
= "cannot connect to pwcheck daemon";
129 iov
[0].iov_base
= (char *)userid
;
130 iov
[0].iov_len
= strlen(userid
)+1;
131 iov
[1].iov_base
= (char *)passwd
;
132 iov
[1].iov_len
= strlen(passwd
)+1;
134 retry_writev(s
, iov
, 2);
137 while (start
< sizeof(response
) - 1) {
138 n
= read(s
, response
+start
, sizeof(response
) - 1 - start
);
145 if (start
> 1 && !strncmp(response
, "OK", 2)) {
149 response
[start
] = '\0';
158 /* A dummy function that always fails if saslauthd support is not
161 #ifndef CYRUS_SASLAUTHD_SOCKET
162 int saslauthd_verify_password(const uschar
*userid
,
163 const uschar
*passwd
,
164 const uschar
*service
,
166 const uschar
**reply
)
168 userid
= userid
; /* Keep picky compilers happy */
172 *reply
= US
"saslauthd support is not included in this Exim binary";
177 /* This is the real function */
180 /* written from scratch */
181 /* saslauthd daemon-authenticated login */
183 int saslauthd_verify_password(const uschar
*userid
,
184 const uschar
*password
,
185 const uschar
*service
,
187 const uschar
**reply
)
189 uschar
*daemon_reply
= NULL
;
191 struct sockaddr_un srvaddr
;
194 debug_printf("saslauthd userid='%s' servicename='%s'"
195 " realm='%s'\n", userid
, service
, realm
);
199 s
= socket(AF_UNIX
, SOCK_STREAM
, 0);
201 *reply
= CUstrerror(errno
);
205 memset((char *)&srvaddr
, 0, sizeof(srvaddr
));
206 srvaddr
.sun_family
= AF_UNIX
;
207 strncpy(srvaddr
.sun_path
, CYRUS_SASLAUTHD_SOCKET
,
208 sizeof(srvaddr
.sun_path
));
209 r
= connect(s
, (struct sockaddr
*)&srvaddr
, sizeof(srvaddr
));
212 debug_printf("Cannot connect to saslauthd daemon (at '%s'): %s\n",
213 CYRUS_SASLAUTHD_SOCKET
, strerror(errno
));
214 *reply
= string_sprintf("cannot connect to saslauthd daemon at "
215 "%s: %s", CYRUS_SASLAUTHD_SOCKET
,
220 if ( write_string(s
, userid
, Ustrlen(userid
)) < 0) {
222 debug_printf("Failed to send userid to saslauthd daemon \n");
227 if ( write_string(s
, password
, Ustrlen(password
)) < 0) {
229 debug_printf("Failed to send password to saslauthd daemon \n");
234 memset((void *)password
, 0, Ustrlen(password
));
236 if ( write_string(s
, service
, Ustrlen(service
)) < 0) {
238 debug_printf("Failed to send service name to saslauthd daemon \n");
243 if ( write_string(s
, realm
, Ustrlen(realm
)) < 0) {
245 debug_printf("Failed to send realm to saslauthd daemon \n");
250 if ( read_string(s
, &daemon_reply
) < 2) {
252 debug_printf("Corrupted answer '%s' received. \n", daemon_reply
);
260 debug_printf("Answer '%s' received. \n", daemon_reply
);
262 *reply
= daemon_reply
;
264 if ( (daemon_reply
[0] == 'O') && (daemon_reply
[1] == 'K') )
267 if ( (daemon_reply
[0] == 'N') && (daemon_reply
[1] == 'O') )
276 /* helper functions */
277 #if defined(CYRUS_PWCHECK_SOCKET) || defined(CYRUS_SASLAUTHD_SOCKET)
279 #define MAX_REQ_LEN 1024
281 /* written from scratch */
283 /* FUNCTION: read_string */
286 * read a sasld-style counted string into
287 * store-allocated buffer, set pointer to the buffer,
288 * return number of bytes read or -1 on failure.
291 static int read_string(int fd
, uschar
**retval
) {
292 unsigned short count
;
295 rc
= (retry_read(fd
, &count
, sizeof(count
)) < (int) sizeof(count
));
297 count
= ntohs(count
);
298 if (count
> MAX_REQ_LEN
) {
301 *retval
= store_get(count
+ 1);
302 rc
= (retry_read(fd
, *retval
, count
) < (int) count
);
303 (*retval
)[count
] = '\0';
311 /* FUNCTION: write_string */
314 * write a sasld-style counted string into given fd
315 * written bytes on success, -1 on failure.
318 static int write_string(int fd
, const uschar
*string
, int len
) {
319 unsigned short count
;
325 iov
[0].iov_base
= (void *) &count
;
326 iov
[0].iov_len
= sizeof(count
);
327 iov
[1].iov_base
= (void *) string
;
328 iov
[1].iov_len
= len
;
330 rc
= retry_writev(fd
, iov
, 2);
336 /* taken from cyrus-sasl file saslauthd/saslauthd-unix.c */
338 /* FUNCTION: retry_read */
341 * Keep calling the read() system call with 'fd', 'buf', and 'nbyte'
342 * until all the data is read in or an error occurs.
344 static int retry_read(int fd
, void *inbuf
, unsigned nbyte
)
348 char *buf
= (char *)inbuf
;
350 if (nbyte
== 0) return 0;
353 n
= read(fd
, buf
, nbyte
);
359 if (errno
== EINTR
) continue;
365 if (n
>= (int) nbyte
) return nread
;
372 /* END FUNCTION: retry_read */
374 /* FUNCTION: retry_writev */
377 * Keep calling the writev() system call with 'fd', 'iov', and 'iovcnt'
378 * until all the data is written out or an error occurs.
381 static int /* R: bytes written, or -1 on error */
384 int fd
, /* I: fd to write on */
385 struct iovec
*iov
, /* U: iovec array base
386 * modified as data written */
387 int iovcnt
/* I: number of iovec entries */
392 int n
; /* return value from writev() */
393 int i
; /* loop counter */
394 int written
; /* bytes written so far */
395 static int iov_max
; /* max number of iovec entries */
404 # else /* ! IOV_MAX */
406 # endif /* ! IOV_MAX */
407 #endif /* ! MAXIOV */
412 while (iovcnt
&& iov
[0].iov_len
== 0) {
421 n
= writev(fd
, iov
, iovcnt
> iov_max
? iov_max
: iovcnt
);
423 if (errno
== EINVAL
&& iov_max
> 10) {
427 if (errno
== EINTR
) {
435 for (i
= 0; i
< iovcnt
; i
++) {
436 if (iov
[i
].iov_len
> (unsigned) n
) {
437 iov
[i
].iov_base
= (char *)iov
[i
].iov_base
+ n
;
452 /* END FUNCTION: retry_writev */
455 /* End of auths/pwcheck.c */