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1 /*
2 * $Id: fcgi_util.c,v 1.32 2007/09/23 16:33:29 robs Exp $
3 */
4
5 #include "fcgi.h"
6
7 #ifdef WIN32
8 #pragma warning( disable : 4100 )
9 #elif defined(APACHE2)
10 #include <netdb.h>
11 #include <unistd.h>
12 #include <grp.h>
13 #include <pwd.h>
14
15 #if APR_HAVE_ARPA_INET_H
16 #include <arpa/inet.h>
17 #endif
18
19 #include "unixd.h"
20 #endif
21
22 uid_t
23 fcgi_util_get_server_uid(const server_rec * const s)
24 {
25 #if defined(WIN32)
26 return (uid_t) 0;
27 #elif defined(APACHE2)
28 /* the main server's uid */
29 return ap_user_id;
30 #else
31 /* the vhost's uid */
32 return s->server_uid;
33 #endif
34 }
35
36 uid_t
37 fcgi_util_get_server_gid(const server_rec * const s)
38 {
39 #if defined(WIN32)
40 return (uid_t) 0;
41 #elif defined(APACHE2)
42 /* the main server's gid */
43 return ap_group_id;
44 #else
45 /* the vhost's gid */
46 return s->server_gid;
47 #endif
48 }
49
50 /*******************************************************************************
51 * Compute printable MD5 hash. Pool p is used for scratch as well as for
52 * allocating the hash - use temp storage, and dup it if you need to keep it.
53 */
54 char *
55 fcgi_util_socket_hash_filename(pool *p, const char *path,
56 const char *user, const char *group)
57 {
58 char *buf = ap_pstrcat(p, path, user, group, NULL);
59
60 /* Canonicalize the path (remove "//", ".", "..") */
61 ap_getparents(buf);
62
63 return ap_md5(p, (unsigned char *)buf);
64 }
65
66
67 /*******************************************************************************
68 * Concat src1 and src2 using the approprate path seperator for the platform.
69 */
70 static char * make_full_path(pool *a, const char *src1, const char *src2)
71 {
72 #ifdef WIN32
73 register int x;
74 char * p ;
75 char * q ;
76
77 x = strlen(src1);
78
79 if (x == 0) {
80 p = ap_pstrcat(a, "\\", src2, NULL);
81 }
82 else if (src1[x - 1] != '\\' && src1[x - 1] != '/') {
83 p = ap_pstrcat(a, src1, "\\", src2, NULL);
84 }
85 else {
86 p = ap_pstrcat(a, src1, src2, NULL);
87 }
88
89 q = p ;
90 while (*q)
91 {
92 if (*q == '/') {
93 *q = '\\' ;
94 }
95 ++q;
96 }
97
98 return p ;
99 #else
100 return ap_make_full_path(a, src1, src2);
101 #endif
102 }
103
104 /*******************************************************************************
105 * Return absolute path to file in either "regular" FCGI socket directory or
106 * the dynamic directory. Result is allocated in pool p.
107 */
108 const char *
109 fcgi_util_socket_make_path_absolute(pool * const p,
110 const char *const file, const int dynamic)
111 {
112 #ifdef APACHE2
113 if (ap_os_is_path_absolute(p, (char *) file))
114 #else
115 if (ap_os_is_path_absolute(file))
116 #endif
117 {
118 return file;
119 }
120 else
121 {
122 const char * parent_dir = dynamic ? fcgi_dynamic_dir : fcgi_socket_dir;
123 return (const char *) make_full_path(p, parent_dir, file);
124 }
125 }
126
127 #ifndef WIN32
128 /*******************************************************************************
129 * Build a Domain Socket Address structure, and calculate its size.
130 * The error message is allocated from the pool p. If you don't want the
131 * struct sockaddr_un also allocated from p, pass it preallocated (!=NULL).
132 */
133 const char *
134 fcgi_util_socket_make_domain_addr(pool *p, struct sockaddr_un **socket_addr,
135 int *socket_addr_len, const char *socket_path)
136 {
137 int socket_pathLen = strlen(socket_path);
138
139 if (socket_pathLen >= sizeof((*socket_addr)->sun_path)) {
140 return ap_pstrcat(p, "path \"", socket_path,
141 "\" is too long for a Domain socket", NULL);
142 }
143
144 if (*socket_addr == NULL)
145 *socket_addr = ap_pcalloc(p, sizeof(struct sockaddr_un));
146 else
147 memset(*socket_addr, 0, sizeof(struct sockaddr_un));
148
149 (*socket_addr)->sun_family = AF_UNIX;
150 strcpy((*socket_addr)->sun_path, socket_path);
151
152 *socket_addr_len = SUN_LEN(*socket_addr);
153 return NULL;
154 }
155 #endif
156
157 /*******************************************************************************
158 * Convert a hostname or IP address string to an in_addr struct.
159 */
160 static int
161 convert_string_to_in_addr(const char * const hostname, struct in_addr * const addr)
162 {
163 struct hostent *hp;
164 int count;
165
166 addr->s_addr = inet_addr((char *)hostname);
167
168 #if !defined(INADDR_NONE) && defined(APACHE2)
169 #define INADDR_NONE APR_INADDR_NONE
170 #endif
171
172 if (addr->s_addr == INADDR_NONE) {
173 if ((hp = gethostbyname((char *)hostname)) == NULL)
174 return -1;
175
176 memcpy((char *) addr, hp->h_addr, hp->h_length);
177 count = 0;
178 while (hp->h_addr_list[count] != 0)
179 count++;
180
181 return count;
182 }
183 return 1;
184 }
185
186
187 /*******************************************************************************
188 * Build an Inet Socket Address structure, and calculate its size.
189 * The error message is allocated from the pool p. If you don't want the
190 * struct sockaddr_in also allocated from p, pass it preallocated (!=NULL).
191 */
192 const char *
193 fcgi_util_socket_make_inet_addr(pool *p, struct sockaddr_in **socket_addr,
194 int *socket_addr_len, const char *host, unsigned short port)
195 {
196 if (*socket_addr == NULL)
197 *socket_addr = ap_pcalloc(p, sizeof(struct sockaddr_in));
198 else
199 memset(*socket_addr, 0, sizeof(struct sockaddr_in));
200
201 (*socket_addr)->sin_family = AF_INET;
202 (*socket_addr)->sin_port = htons(port);
203
204 /* Get an in_addr represention of the host */
205 if (host != NULL) {
206 if (convert_string_to_in_addr(host, &(*socket_addr)->sin_addr) != 1) {
207 return ap_pstrcat(p, "failed to resolve \"", host,
208 "\" to exactly one IP address", NULL);
209 }
210 } else {
211 (*socket_addr)->sin_addr.s_addr = htonl(INADDR_ANY);
212 }
213
214 *socket_addr_len = sizeof(struct sockaddr_in);
215 return NULL;
216 }
217
218 /*******************************************************************************
219 * Determine if a process with uid/gid can access a file with mode permissions.
220 */
221 const char *
222 fcgi_util_check_access(pool *tp,
223 const char * const path, const struct stat *statBuf,
224 const int mode, const uid_t uid, const gid_t gid)
225 {
226 struct stat myStatBuf;
227
228 if (statBuf == NULL) {
229 if (stat(path, &myStatBuf) < 0)
230 return ap_psprintf(tp, "stat(%s) failed: %s", path, strerror(errno));
231 statBuf = &myStatBuf;
232 }
233
234 #ifndef WIN32
235 /* If the uid owns the file, check the owner bits */
236 if (uid == statBuf->st_uid) {
237 if (mode & R_OK && !(statBuf->st_mode & S_IRUSR))
238 return "read not allowed by owner";
239 if (mode & W_OK && !(statBuf->st_mode & S_IWUSR))
240 return "write not allowed by owner";
241 if (mode & X_OK && !(statBuf->st_mode & S_IXUSR))
242 return "execute not allowed by owner";
243 return NULL;
244 }
245 #else
246 if (mode & _S_IREAD && !(statBuf->st_mode & _S_IREAD))
247 return "read not allowed";
248 if (mode & _S_IWRITE && !(statBuf->st_mode & _S_IWRITE))
249 return "write not allowed";
250
251 /* I don't think this works on FAT, but since I don't know how to check..
252 * if (mode & _S_IEXEC && !(statBuf->st_mode & _S_IEXEC))
253 * return "execute not allowed"; */
254 #endif
255
256 #if !defined(__EMX__) && !defined(WIN32)
257 /* If the gid is same as the file's group, check the group bits */
258 if (gid == statBuf->st_gid) {
259 if (mode & R_OK && !(statBuf->st_mode & S_IRGRP))
260 return "read not allowed by group";
261 if (mode & W_OK && !(statBuf->st_mode & S_IWGRP))
262 return "write not allowed by group";
263 if (mode & X_OK && !(statBuf->st_mode & S_IXGRP))
264 return "execute not allowed by group";
265 return NULL;
266 }
267
268 /* Get the user membership for the file's group. If the
269 * uid is a member, check the group bits. */
270 {
271 const struct group * const gr = getgrgid(statBuf->st_gid);
272 const struct passwd * const pw = getpwuid(uid);
273
274 if (gr != NULL && pw != NULL) {
275 char **user = gr->gr_mem;
276 for ( ; *user != NULL; user++) {
277 if (strcmp(*user, pw->pw_name) == 0) {
278 if (mode & R_OK && !(statBuf->st_mode & S_IRGRP))
279 return "read not allowed by group";
280 if (mode & W_OK && !(statBuf->st_mode & S_IWGRP))
281 return "write not allowed by group";
282 if (mode & X_OK && !(statBuf->st_mode & S_IXGRP))
283 return "execute not allowed by group";
284 return NULL;
285 }
286 }
287 }
288 }
289
290 /* That just leaves the other bits.. */
291 if (mode & R_OK && !(statBuf->st_mode & S_IROTH))
292 return "read not allowed";
293 if (mode & W_OK && !(statBuf->st_mode & S_IWOTH))
294 return "write not allowed";
295 if (mode & X_OK && !(statBuf->st_mode & S_IXOTH))
296 return "execute not allowed";
297 #endif
298
299 return NULL;
300 }
301
302
303 /*******************************************************************************
304 * Find a FastCGI server with a matching fs_path, and if fcgi_wrapper is
305 * enabled with matching uid and gid.
306 */
307 fcgi_server *
308 fcgi_util_fs_get_by_id(const char *ePath, uid_t uid, gid_t gid)
309 {
310 char path[FCGI_MAXPATH];
311 fcgi_server *s;
312
313 /* @@@ This should now be done in the loop below */
314 ap_cpystrn(path, ePath, FCGI_MAXPATH);
315 ap_no2slash(path);
316
317 for (s = fcgi_servers; s != NULL; s = s->next) {
318 int i;
319 const char *fs_path = s->fs_path;
320 for (i = 0; fs_path[i] && path[i]; ++i) {
321 if (fs_path[i] != path[i]) {
322 break;
323 }
324 }
325 if (fs_path[i]) {
326 continue;
327 }
328 if (path[i] == '\0' || path[i] == '/') {
329 if (fcgi_wrapper == NULL || (uid == s->uid && gid == s->gid))
330 return s;
331 }
332 }
333 return NULL;
334 }
335
336 /*******************************************************************************
337 * Find a FastCGI server with a matching fs_path, and if fcgi_wrapper is
338 * enabled with matching user and group.
339 */
340 fcgi_server *
341 fcgi_util_fs_get(const char *ePath, const char *user, const char *group)
342 {
343 char path[FCGI_MAXPATH];
344 fcgi_server *s;
345
346 ap_cpystrn(path, ePath, FCGI_MAXPATH);
347 ap_no2slash(path);
348
349 for (s = fcgi_servers; s != NULL; s = s->next) {
350 if (strcmp(s->fs_path, path) == 0) {
351 if (fcgi_wrapper == NULL)
352 return s;
353
354 if (strcmp(user, s->user) == 0
355 && (user[0] == '~' || strcmp(group, s->group) == 0))
356 {
357 return s;
358 }
359 }
360 }
361 return NULL;
362 }
363
364 const char *
365 fcgi_util_fs_is_path_ok(pool * const p, const char * const fs_path, struct stat *finfo)
366 {
367 const char *err;
368
369 if (finfo == NULL) {
370 finfo = (struct stat *)ap_palloc(p, sizeof(struct stat));
371 if (stat(fs_path, finfo) < 0)
372 return ap_psprintf(p, "stat(%s) failed: %s", fs_path, strerror(errno));
373 }
374
375 if (finfo->st_mode == 0)
376 return ap_psprintf(p, "script not found or unable to stat()");
377
378 if (S_ISDIR(finfo->st_mode))
379 return ap_psprintf(p, "script is a directory!");
380
381 /* Let the wrapper determine what it can and can't execute */
382 if (! fcgi_wrapper)
383 {
384 #ifdef WIN32
385 err = fcgi_util_check_access(p, fs_path, finfo, _S_IEXEC, fcgi_user_id, fcgi_group_id);
386 #else
387 err = fcgi_util_check_access(p, fs_path, finfo, X_OK, fcgi_user_id, fcgi_group_id);
388 #endif
389 if (err) {
390 return ap_psprintf(p,
391 "access for server (uid %ld, gid %ld) not allowed: %s",
392 (long)fcgi_user_id, (long)fcgi_group_id, err);
393 }
394 }
395
396 return NULL;
397 }
398
399
400
401 /*******************************************************************************
402 * Allocate a new FastCGI server record from pool p with default values.
403 */
404 fcgi_server *
405 fcgi_util_fs_new(pool *p)
406 {
407 fcgi_server *s = (fcgi_server *) ap_pcalloc(p, sizeof(fcgi_server));
408
409 /* Initialize anything who's init state is not zeroizzzzed */
410 s->listenQueueDepth = FCGI_DEFAULT_LISTEN_Q;
411 s->appConnectTimeout = FCGI_DEFAULT_APP_CONN_TIMEOUT;
412 s->idle_timeout = FCGI_DEFAULT_IDLE_TIMEOUT;
413 s->initStartDelay = DEFAULT_INIT_START_DELAY;
414 s->restartDelay = FCGI_DEFAULT_RESTART_DELAY;
415 s->minServerLife = FCGI_DEFAULT_MIN_SERVER_LIFE;
416 s->restartOnExit = FALSE;
417 s->directive = APP_CLASS_UNKNOWN;
418 s->processPriority = FCGI_DEFAULT_PRIORITY;
419 s->envp = &fcgi_empty_env;
420
421 #ifdef WIN32
422 s->listenFd = (int) INVALID_HANDLE_VALUE;
423 #else
424 s->listenFd = -2;
425 #endif
426
427 return s;
428 }
429
430 /*******************************************************************************
431 * Add the server to the linked list of FastCGI servers.
432 */
433 void
434 fcgi_util_fs_add(fcgi_server *s)
435 {
436 s->next = fcgi_servers;
437 fcgi_servers = s;
438 }
439
440 /*******************************************************************************
441 * Configure uid, gid, user, group, username for wrapper.
442 */
443 const char *
444 fcgi_util_fs_set_uid_n_gid(pool *p, fcgi_server *s, uid_t uid, gid_t gid)
445 {
446 #ifndef WIN32
447
448 struct passwd *pw;
449 struct group *gr;
450
451 if (fcgi_wrapper == NULL)
452 return NULL;
453
454 if (uid == 0 || gid == 0) {
455 return "invalid uid or gid, see the -user and -group options";
456 }
457
458 s->uid = uid;
459 pw = getpwuid(uid);
460 if (pw == NULL) {
461 return ap_psprintf(p,
462 "getpwuid() couldn't determine the username for uid '%ld', "
463 "you probably need to modify the User directive: %s",
464 (long)uid, strerror(errno));
465 }
466 s->user = ap_pstrdup(p, pw->pw_name);
467 s->username = s->user;
468
469 s->gid = gid;
470 gr = getgrgid(gid);
471 if (gr == NULL) {
472 return ap_psprintf(p,
473 "getgrgid() couldn't determine the group name for gid '%ld', "
474 "you probably need to modify the Group directive: %s",
475 (long)gid, strerror(errno));
476 }
477 s->group = ap_pstrdup(p, gr->gr_name);
478
479 #endif /* !WIN32 */
480
481 return NULL;
482 }
483
484 /*******************************************************************************
485 * Allocate an array of ServerProcess records.
486 */
487 ServerProcess *
488 fcgi_util_fs_create_procs(pool *p, int num)
489 {
490 int i;
491 ServerProcess *proc = (ServerProcess *)ap_pcalloc(p, sizeof(ServerProcess) * num);
492
493 for (i = 0; i < num; i++) {
494 #ifdef WIN32
495 proc[i].handle = INVALID_HANDLE_VALUE;
496 proc[i].terminationEvent = INVALID_HANDLE_VALUE;
497 #endif
498 proc[i].pid = 0;
499 proc[i].state = FCGI_READY_STATE;
500 }
501 return proc;
502 }
503
504 int fcgi_util_ticks(struct timeval * tv)
505 {
506 #ifdef WIN32
507 /* millisecs is sufficent granularity */
508 DWORD millis = GetTickCount();
509
510 tv->tv_sec = millis / 1000;
511 tv->tv_usec = (millis % 1000) * 1000;
512
513 return 0;
514 #else
515 return gettimeofday(tv, NULL);
516 #endif
517 }
518
519