d9898ee8 |
1 | /* |
2 | ** Copyright 2001-2005 Double Precision, Inc. See COPYING for |
3 | ** distribution information. |
4 | */ |
5 | |
6 | #if HAVE_CONFIG_H |
7 | #include "courier_auth_config.h" |
8 | #endif |
9 | #include <stdio.h> |
10 | #include <stdlib.h> |
11 | #include <string.h> |
12 | #include <errno.h> |
13 | #include <signal.h> |
14 | #include <pwd.h> |
15 | #if HAVE_UNISTD_H |
16 | #include <unistd.h> |
17 | #endif |
18 | #include "userdb/userdb.h" |
19 | #include "auth.h" |
b0322a85 |
20 | #include "courierauthstaticlist.h" |
d9898ee8 |
21 | #include "authwait.h" |
22 | #include "sbindir.h" |
23 | #include "courierauthdebug.h" |
d9898ee8 |
24 | #include "libhmac/hmac.h" |
d9898ee8 |
25 | |
d9898ee8 |
26 | |
27 | |
28 | static int bad(const char *q) |
29 | { |
30 | const char *p; |
31 | |
32 | for (p=q; *p; p++) |
33 | if ((int)(unsigned char)*p < ' ' || *p == '|' || *p == '=' |
34 | || *p == '\'' || *p == '"') |
35 | return (1); |
36 | return (0); |
37 | } |
38 | |
39 | |
d9898ee8 |
40 | static char *hmacpw(const char *pw, const char *hash) |
41 | { |
42 | int i; |
43 | |
44 | for (i=0; hmac_list[i] && |
45 | strcmp(hmac_list[i]->hh_name, hash); i++) |
46 | ; |
47 | if (hmac_list[i]) |
48 | { |
49 | struct hmac_hashinfo *hmac=hmac_list[i]; |
50 | unsigned char *p=malloc(hmac->hh_L*2); |
51 | char *q=malloc(hmac->hh_L*4+1); |
52 | unsigned i; |
53 | |
54 | if (!p || !q) |
55 | { |
56 | perror("malloc"); |
57 | exit(1); |
58 | } |
59 | |
60 | hmac_hashkey(hmac, pw, strlen(pw), p, p+hmac->hh_L); |
61 | for (i=0; i<hmac->hh_L*2; i++) |
62 | sprintf(q+i*2, "%02x", (int)p[i]); |
63 | free(p); |
64 | return (q); |
65 | } |
66 | return (NULL); |
67 | } |
d9898ee8 |
68 | |
69 | static int dochangepwd1(const char *, const char *, const char *, const char *, |
70 | const char *); |
71 | |
72 | static int try_auth_userdb_passwd(const char *hmac_flag, |
73 | const char *service, |
74 | const char *uid, |
75 | const char *opwd_buf, |
76 | const char *npwd_buf); |
77 | static int makeuserdb(); |
78 | |
79 | int auth_userdb_passwd(const char *service, |
80 | const char *uid, |
81 | const char *opwd_buf, |
82 | const char *npwd_buf) |
83 | { |
84 | int rc; |
85 | int rc2; |
86 | |
87 | if (bad(uid) || strchr(uid, '/')) |
88 | { |
89 | errno=EPERM; |
90 | DPRINTF("userdb: %s is not a valid userid.\n", |
91 | uid); |
92 | return -1; |
93 | } |
94 | |
95 | if (bad(service) || |
96 | bad(opwd_buf) || |
97 | bad(npwd_buf)) |
98 | { |
99 | errno=EPERM; |
100 | DPRINTF("userdb: Invalid service or password string for %s.\n", |
101 | uid); |
0e333c05 |
102 | return (-1); |
d9898ee8 |
103 | } |
104 | |
105 | rc=try_auth_userdb_passwd(NULL, service, uid, opwd_buf, npwd_buf); |
106 | |
107 | if (rc > 0) |
108 | return rc; |
109 | |
d9898ee8 |
110 | { |
111 | int i; |
112 | |
113 | |
114 | for (i=0; hmac_list[i]; i++) |
115 | { |
116 | const char *n=hmac_list[i]->hh_name; |
117 | |
118 | char *hmacservice=malloc(strlen(service)+strlen(n) |
119 | +sizeof("-hmac-")); |
120 | |
121 | if (hmacservice == NULL) |
122 | return (1); |
123 | |
124 | strcat(strcat(strcpy(hmacservice, service), |
125 | "-hmac-"), n); |
126 | |
127 | rc2=try_auth_userdb_passwd(n, hmacservice, uid, |
128 | opwd_buf, npwd_buf); |
129 | |
130 | if (rc2 > 0) |
131 | { |
132 | free(hmacservice); |
133 | return (1); |
134 | } |
135 | |
136 | if (rc2 == 0) |
137 | rc=0; |
138 | |
139 | strcat(strcpy(hmacservice, "hmac-"), n); |
140 | |
141 | rc2=try_auth_userdb_passwd(n, hmacservice, uid, |
142 | opwd_buf, npwd_buf); |
143 | free(hmacservice); |
144 | if (rc2 > 0) |
145 | return (1); |
146 | |
147 | if (rc2 == 0) |
148 | rc=0; |
149 | |
150 | } |
151 | } |
d9898ee8 |
152 | |
153 | if (rc == 0) |
154 | { |
155 | rc=makeuserdb(); |
156 | |
157 | if (rc) |
158 | { |
159 | DPRINTF("makeuserdb: error: %s", strerror(errno)); |
160 | } |
161 | } |
162 | |
163 | DPRINTF("authuserdb: return code %d", rc); |
164 | return rc; |
165 | } |
166 | |
167 | static int try_auth_userdb_passwd(const char *hmac_flag, |
168 | const char *service, |
169 | const char *uid, |
170 | const char *opwd_buf, |
171 | const char *npwd_buf) |
172 | { |
173 | char *opwd; |
174 | char *npwd; |
175 | int rc; |
176 | |
d9898ee8 |
177 | if (hmac_flag) |
178 | { |
179 | DPRINTF("Trying to change password for %s", |
180 | hmac_flag); |
181 | |
182 | DPWPRINTF("Old password=%s, new password=%s", |
183 | opwd_buf, npwd_buf); |
184 | |
185 | opwd=hmacpw(opwd_buf, hmac_flag); |
186 | if (!opwd) |
187 | return 1; |
188 | |
189 | npwd=hmacpw(npwd_buf, hmac_flag); |
190 | |
191 | if (!npwd) |
192 | { |
193 | free(opwd); |
194 | return (1); |
195 | } |
196 | } |
197 | else |
d9898ee8 |
198 | { |
199 | DPRINTF("Trying to change system password for %s", |
200 | service); |
201 | |
202 | DPWPRINTF("Old password=%s, new password=%s", |
203 | opwd_buf, npwd_buf); |
204 | |
205 | opwd=strdup(opwd_buf); |
206 | if (!opwd) |
207 | { |
208 | return (1); |
209 | } |
210 | |
211 | npwd=userdb_mkmd5pw(npwd_buf); |
212 | if (!npwd || !(npwd=strdup(npwd))) |
213 | { |
214 | free(opwd); |
215 | errno=EPERM; |
216 | return (1); |
217 | } |
218 | } |
219 | |
220 | |
221 | rc=dochangepwd1(service, uid, opwd, npwd, hmac_flag); |
222 | |
223 | free(opwd); |
224 | free(npwd); |
225 | return (rc); |
226 | } |
227 | |
228 | static int dochangepwd2(const char *service, const char *uid, |
229 | char *u, |
230 | const struct userdbs *udb, const char *npwd); |
231 | |
232 | static int dochangepwd1(const char *service, const char *uid, |
233 | const char *opwd, const char *npwd, |
234 | const char *hmac_flag) |
235 | { |
236 | char *udbs; |
237 | char *services; |
238 | char *passwords; |
239 | int rc; |
240 | |
241 | char *u; |
242 | struct userdbs *udb; |
243 | |
244 | |
245 | udbs=userdbshadow(USERDB "shadow.dat", uid); |
246 | |
247 | if (!udbs) |
248 | { |
249 | errno=ENOENT; |
250 | return (-1); |
251 | } |
252 | |
253 | if ((services=malloc(strlen(service)+sizeof("pw"))) == 0) |
254 | { |
255 | perror("malloc"); |
256 | free(udbs); |
257 | errno=EPERM; |
258 | return (1); |
259 | } |
260 | |
261 | strcat(strcpy(services, service), "pw"); |
262 | |
263 | DPRINTF("Checking for password called \"%s\"", services); |
264 | |
265 | passwords=userdb_gets(udbs, services); |
266 | free(services); |
267 | |
268 | if (passwords == 0 && hmac_flag == 0) |
269 | { |
270 | DPRINTF("Not found, checking for \"systempw\""); |
271 | passwords=userdb_gets(udbs, "systempw"); |
272 | service="system"; |
273 | } |
274 | |
275 | if (!passwords || (hmac_flag ? strcmp(opwd, passwords): |
276 | authcheckpassword(opwd, passwords))) |
277 | { |
278 | if (!passwords) |
279 | { |
280 | DPRINTF("Password not found."); |
281 | } |
282 | else |
283 | { |
284 | DPRINTF("Password didn't match."); |
285 | } |
286 | |
287 | if (passwords) |
288 | free(passwords); |
289 | free(udbs); |
290 | errno=EPERM; |
291 | return (-1); |
292 | } |
293 | free(passwords); |
294 | free(udbs); |
295 | |
296 | userdb_init(USERDB ".dat"); |
297 | if ( (u=userdb(uid)) == 0 || |
298 | (udb=userdb_creates(u)) == 0) |
299 | { |
300 | if (u) |
301 | free(u); |
302 | errno=EPERM; |
303 | return (1); |
304 | } |
305 | |
306 | rc=dochangepwd2(service, uid, u, udb, npwd); |
307 | |
308 | userdb_frees(udb); |
309 | free(u); |
310 | return (rc); |
311 | } |
312 | |
313 | static int dochangepwd2(const char *services, const char *uid, |
314 | char *u, |
315 | const struct userdbs *udb, const char *npwd) |
316 | { |
317 | char *argv[10]; |
318 | pid_t p, p2; |
319 | int waitstat; |
320 | |
321 | argv[0]=SBINDIR "/userdb"; |
322 | argv[1]=malloc(strlen(udb->udb_source ? udb->udb_source:"") |
323 | +strlen(uid)+1); |
324 | |
325 | if (!argv[1]) |
326 | { |
327 | errno=EPERM; |
328 | return (1); |
329 | } |
330 | strcpy(argv[1],udb->udb_source ? udb->udb_source:""); |
331 | strcat(argv[1],uid); |
332 | argv[2]="set"; |
333 | |
334 | argv[3]=malloc(strlen(services)+strlen(npwd)+10); |
335 | if (!argv[3]) |
336 | { |
337 | free(argv[1]); |
338 | errno=EPERM; |
339 | return (1); |
340 | } |
341 | |
342 | sprintf(argv[3], "%spw=%s", services, npwd); |
343 | signal(SIGCHLD, SIG_DFL); |
344 | argv[4]=0; |
345 | |
346 | DPRINTF("Executing %s %s %s %s%s", |
347 | argv[0], |
348 | argv[1], |
349 | argv[2], |
350 | courier_authdebug_login_level >= 2 ? argv[3]:services, |
351 | courier_authdebug_login_level >= 2 ? "":"pw=******"); |
352 | |
353 | p=fork(); |
354 | |
355 | if (p < 0) |
356 | { |
357 | free(argv[3]); |
358 | free(argv[1]); |
359 | errno=EPERM; |
360 | return (1); |
361 | } |
362 | |
363 | if (p == 0) |
364 | { |
365 | execv(argv[0], argv); |
366 | perror(argv[0]); |
367 | exit(1); |
368 | } |
369 | |
370 | free(argv[1]); |
371 | free(argv[3]); |
372 | |
373 | while ((p2=wait(&waitstat)) != p) |
374 | { |
375 | if (p2 < 0 && errno == ECHILD) |
376 | { |
377 | perror("wait"); |
378 | errno=EPERM; |
379 | return (1); |
380 | } |
381 | } |
382 | |
383 | if (!WIFEXITED(waitstat) || WEXITSTATUS(waitstat)) |
384 | { |
385 | DPRINTF("Command failed: with exit code %d", |
386 | (int)WEXITSTATUS(waitstat)); |
387 | errno=EPERM; |
388 | return (1); |
389 | } |
390 | DPRINTF("Command succeeded: with exit code %d", |
391 | (int)WEXITSTATUS(waitstat)); |
392 | return 0; |
393 | } |
394 | |
395 | static int makeuserdb() |
396 | { |
397 | char *argv[2]; |
398 | pid_t p, p2; |
399 | int waitstat; |
400 | |
401 | DPRINTF("Executing makeuserdb"); |
402 | p=fork(); |
403 | |
404 | if (p < 0) |
405 | { |
406 | perror("fork"); |
407 | return (1); |
408 | } |
409 | |
410 | if (p == 0) |
411 | { |
412 | argv[0]= SBINDIR "/makeuserdb"; |
413 | argv[1]=0; |
414 | |
415 | execv(argv[0], argv); |
416 | perror(argv[0]); |
417 | exit(1); |
418 | } |
419 | |
420 | while ((p2=wait(&waitstat)) != p) |
421 | { |
422 | if (p2 < 0 && errno == ECHILD) |
423 | { |
424 | errno=EPERM; |
425 | return (1); |
426 | } |
427 | } |
428 | |
429 | if (!WIFEXITED(waitstat) || WEXITSTATUS(waitstat)) |
430 | { |
431 | errno=EPERM; |
432 | return (1); |
433 | } |
434 | return (0); |
435 | } |