Commit | Line | Data |
---|---|---|
baaabaf7 FT |
1 | /* |
2 | ashd - A Sane HTTP Daemon | |
3 | Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com> | |
4 | ||
5 | This program is free software: you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation, either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
19 | #include <stdlib.h> | |
20 | #include <stdio.h> | |
21 | #include <unistd.h> | |
22 | #include <string.h> | |
23 | #include <errno.h> | |
24 | #include <sys/poll.h> | |
25 | #include <sys/wait.h> | |
26 | #include <time.h> | |
27 | #include <signal.h> | |
28 | ||
29 | #ifdef HAVE_CONFIG_H | |
30 | #include <config.h> | |
31 | #endif | |
32 | #include <utils.h> | |
33 | #include <log.h> | |
34 | #include <req.h> | |
35 | #include <proc.h> | |
36 | #include <resp.h> | |
37 | ||
38 | struct cache { | |
39 | struct cache *next, *prev; | |
40 | char *user, *pass; | |
41 | time_t lastuse; | |
42 | }; | |
43 | ||
44 | static int ch; | |
45 | static char **authcmd; | |
46 | static char *realm; | |
47 | static int docache = 1, reqssl; | |
48 | static struct cache *cache; | |
49 | static time_t now, lastclean; | |
50 | ||
51 | static int auth(struct hthead *req, int fd, char *user, char *pass); | |
52 | ||
53 | static void reqauth(struct hthead *req, int fd) | |
54 | { | |
55 | struct charbuf buf; | |
56 | FILE *out; | |
57 | char *rn; | |
58 | ||
59 | rn = realm; | |
60 | if(rn == NULL) | |
61 | rn = "auth"; | |
62 | bufinit(buf); | |
63 | bufcatstr(buf, "<?xml version=\"1.0\" encoding=\"US-ASCII\"?>\r\n"); | |
64 | bufcatstr(buf, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\r\n"); | |
65 | bufcatstr(buf, "<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"en-US\" xml:lang=\"en-US\">\r\n"); | |
66 | bufcatstr(buf, "<head>\r\n"); | |
67 | bprintf(&buf, "<title>Authentication Required</title>\r\n"); | |
68 | bufcatstr(buf, "</head>\r\n"); | |
69 | bufcatstr(buf, "<body>\r\n"); | |
70 | bprintf(&buf, "<h1>Authentication Required</h1>\r\n"); | |
71 | bprintf(&buf, "<p>You need to authenticate to access the requested resource.</p>\r\n"); | |
72 | bufcatstr(buf, "</body>\r\n"); | |
73 | bufcatstr(buf, "</html>\r\n"); | |
74 | out = fdopen(dup(fd), "w"); | |
75 | fprintf(out, "HTTP/1.1 401 Authentication Required\n"); | |
76 | fprintf(out, "WWW-Authenticate: Basic realm=\"%s\"\n", rn); | |
77 | fprintf(out, "Content-Type: text/html\n"); | |
78 | fprintf(out, "Content-Length: %zi\n", buf.d); | |
79 | fprintf(out, "\n"); | |
80 | fwrite(buf.b, 1, buf.d, out); | |
81 | fclose(out); | |
82 | buffree(buf); | |
83 | } | |
84 | ||
3a0ec493 FT |
85 | static void authinval(struct hthead *req, int fd, char *msg) |
86 | { | |
87 | struct charbuf buf; | |
88 | FILE *out; | |
89 | char *rn; | |
90 | ||
91 | rn = realm; | |
92 | if(rn == NULL) | |
93 | rn = "auth"; | |
94 | bufinit(buf); | |
95 | bufcatstr(buf, "<?xml version=\"1.0\" encoding=\"US-ASCII\"?>\r\n"); | |
96 | bufcatstr(buf, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\r\n"); | |
97 | bufcatstr(buf, "<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"en-US\" xml:lang=\"en-US\">\r\n"); | |
98 | bufcatstr(buf, "<head>\r\n"); | |
99 | bprintf(&buf, "<title>Invalid authentication</title>\r\n"); | |
100 | bufcatstr(buf, "</head>\r\n"); | |
101 | bufcatstr(buf, "<body>\r\n"); | |
102 | bprintf(&buf, "<h1>Invalid authentication</h1>\r\n"); | |
103 | bprintf(&buf, "<p>%s</p>\r\n", htmlquote(msg)); | |
104 | bufcatstr(buf, "</body>\r\n"); | |
105 | bufcatstr(buf, "</html>\r\n"); | |
106 | out = fdopen(dup(fd), "w"); | |
107 | fprintf(out, "HTTP/1.1 401 Invalid authentication\n"); | |
108 | fprintf(out, "WWW-Authenticate: Basic realm=\"%s\"\n", rn); | |
109 | fprintf(out, "Content-Type: text/html\n"); | |
110 | fprintf(out, "Content-Length: %zi\n", buf.d); | |
111 | fprintf(out, "\n"); | |
112 | fwrite(buf.b, 1, buf.d, out); | |
113 | fclose(out); | |
114 | buffree(buf); | |
115 | } | |
116 | ||
baaabaf7 FT |
117 | static void cleancache(int complete) |
118 | { | |
119 | struct cache *c, *n; | |
120 | ||
121 | for(c = cache; c != NULL; c = n) { | |
122 | n = c->next; | |
123 | if(complete || (now - c->lastuse > 3600)) { | |
124 | if(c->next) | |
125 | c->next->prev = c->prev; | |
126 | if(c->prev) | |
127 | c->prev->next = c->next; | |
128 | if(c == cache) | |
129 | cache = c->next; | |
130 | memset(c->pass, 0, strlen(c->pass)); | |
131 | free(c->user); | |
132 | free(c->pass); | |
133 | free(c); | |
134 | } | |
135 | } | |
136 | lastclean = now; | |
137 | } | |
138 | ||
139 | static int ckcache(char *user, char *pass) | |
140 | { | |
141 | struct cache *c; | |
142 | ||
143 | for(c = cache; c != NULL; c = c->next) { | |
144 | if(!strcmp(user, c->user) && !strcmp(pass, c->pass)) { | |
145 | c->lastuse = now; | |
146 | return(1); | |
147 | } | |
148 | } | |
149 | return(0); | |
150 | } | |
151 | ||
152 | static struct cache *addcache(char *user, char *pass) | |
153 | { | |
154 | struct cache *c; | |
155 | ||
156 | omalloc(c); | |
157 | c->user = sstrdup(user); | |
158 | c->pass = sstrdup(pass); | |
159 | c->lastuse = now; | |
160 | c->next = cache; | |
161 | if(cache != NULL) | |
162 | cache->prev = c; | |
163 | cache = c; | |
164 | return(c); | |
165 | } | |
166 | ||
167 | static void serve2(struct hthead *req, int fd, char *user) | |
168 | { | |
169 | headappheader(req, "X-Ash-Remote-User", user); | |
170 | if(sendreq(ch, req, fd)) { | |
171 | flog(LOG_ERR, "htextauth: could not pass request to child: %s", strerror(errno)); | |
172 | exit(1); | |
173 | } | |
174 | } | |
175 | ||
176 | static void serve(struct hthead *req, int fd) | |
177 | { | |
178 | char *raw, *dec, *p; | |
179 | size_t declen; | |
180 | ||
181 | now = time(NULL); | |
b4fda020 | 182 | dec = NULL; |
baaabaf7 FT |
183 | if(reqssl && (((raw = getheader(req, "X-Ash-Protocol")) == NULL) || strcmp(raw, "https"))) { |
184 | simpleerror(fd, 403, "Forbidden", "The requested resource must be requested over HTTPS."); | |
185 | goto out; | |
186 | } | |
baaabaf7 FT |
187 | if(((raw = getheader(req, "Authorization")) == NULL) || strncasecmp(raw, "basic ", 6)) { |
188 | reqauth(req, fd); | |
189 | goto out; | |
190 | } | |
191 | if((dec = base64decode(raw + 6, &declen)) == NULL) { | |
192 | simpleerror(fd, 400, "Invalid request", "The authentication data is not proper base64."); | |
193 | goto out; | |
194 | } | |
195 | memset(raw, 0, strlen(raw)); | |
196 | headrmheader(req, "Authorization"); | |
fb9b1027 FT |
197 | for(p = dec; *p; p++) { |
198 | if(*p < 32) { | |
199 | simpleerror(fd, 400, "Invalid request", "The authentication data is invalid."); | |
200 | goto out; | |
201 | } | |
202 | } | |
baaabaf7 FT |
203 | if((p = strchr(dec, ':')) == NULL) { |
204 | simpleerror(fd, 400, "Invalid request", "The authentication data is invalid."); | |
205 | goto out; | |
206 | } | |
207 | *(p++) = 0; | |
208 | if(docache && ckcache(dec, p)) { | |
209 | serve2(req, fd, dec); | |
210 | goto out; | |
211 | } | |
212 | if(auth(req, fd, dec, p)) { | |
213 | if(docache) | |
214 | addcache(dec, p); | |
215 | serve2(req, fd, dec); | |
216 | goto out; | |
217 | } | |
218 | ||
219 | out: | |
220 | if(dec != NULL) { | |
221 | memset(dec, 0, declen); | |
222 | free(dec); | |
223 | } | |
224 | if(docache && (now - lastclean > 60)) | |
225 | cleancache(0); | |
226 | } | |
227 | ||
228 | static int auth(struct hthead *req, int fd, char *user, char *pass) | |
229 | { | |
230 | int i, rv, status; | |
231 | ssize_t len; | |
232 | char *msg; | |
233 | struct charbuf ebuf; | |
234 | pid_t pid; | |
235 | int pfd[2], efd[2]; | |
236 | FILE *out; | |
237 | ||
238 | rv = 0; | |
baaabaf7 FT |
239 | msg = "The supplied credentials are invalid."; |
240 | pipe(pfd); | |
241 | pipe(efd); | |
242 | if((pid = fork()) < 0) { | |
243 | flog(LOG_ERR, "htextauth: could not fork: %s", strerror(errno)); | |
244 | simpleerror(fd, 500, "Server Error", "An internal error occurred."); | |
245 | close(pfd[0]); close(pfd[1]); | |
246 | close(efd[0]); close(efd[1]); | |
247 | return(0); | |
248 | } | |
249 | if(pid == 0) { | |
250 | dup2(pfd[0], 0); | |
251 | dup2(efd[1], 1); | |
252 | for(i = 3; i < FD_SETSIZE; i++) | |
253 | close(i); | |
254 | execvp(authcmd[0], authcmd); | |
255 | flog(LOG_ERR, "htextauth: could not exec %s: %s", authcmd[0], strerror(errno)); | |
256 | exit(127); | |
257 | } | |
258 | close(pfd[0]); | |
259 | close(efd[1]); | |
260 | out = fdopen(pfd[1], "w"); | |
261 | fprintf(out, "%s\n", user); | |
262 | fprintf(out, "%s\n", pass); | |
263 | fclose(out); | |
264 | bufinit(ebuf); | |
265 | while(1) { | |
266 | sizebuf(ebuf, ebuf.d + 128); | |
267 | len = read(efd[0], ebuf.b + ebuf.d, ebuf.s - ebuf.d); | |
268 | if(len < 0) { | |
269 | if(errno == EINTR) | |
270 | continue; | |
271 | break; | |
272 | } else if(len == 0) { | |
273 | break; | |
274 | } | |
275 | ebuf.d += len; | |
276 | } | |
277 | if(ebuf.d > 0) { | |
278 | bufadd(ebuf, 0); | |
279 | msg = ebuf.b; | |
280 | } | |
281 | close(efd[0]); | |
282 | if(waitpid(pid, &status, 0) < 0) { | |
283 | flog(LOG_ERR, "htextauth: could not wait: %s", strerror(errno)); | |
284 | simpleerror(fd, 500, "Server Error", "An internal error occurred."); | |
285 | buffree(ebuf); | |
286 | return(0); | |
287 | } | |
3d6044ab FT |
288 | if(WCOREDUMP(status)) |
289 | flog(LOG_WARNING, "htextauth: authenticator process dumped core"); | |
baaabaf7 FT |
290 | if(WIFEXITED(status) && (WEXITSTATUS(status) == 0)) |
291 | rv = 1; | |
292 | else | |
3a0ec493 | 293 | authinval(req, fd, msg); |
baaabaf7 FT |
294 | buffree(ebuf); |
295 | return(rv); | |
296 | } | |
297 | ||
298 | static void usage(FILE *out) | |
299 | { | |
300 | fprintf(out, "usage: htextauth [-hCs] [-r REALM] AUTHCMD [ARGS...] -- CHILD [ARGS...]\n"); | |
301 | } | |
302 | ||
303 | static void sighandler(int sig) | |
304 | { | |
305 | } | |
306 | ||
307 | int main(int argc, char **argv) | |
308 | { | |
309 | int i, c, ret; | |
310 | struct charvbuf cbuf; | |
311 | struct pollfd pfd[2]; | |
312 | struct hthead *req; | |
313 | int fd; | |
314 | ||
315 | while((c = getopt(argc, argv, "+hCsr:")) >= 0) { | |
316 | switch(c) { | |
317 | case 'h': | |
318 | usage(stdout); | |
319 | return(0); | |
320 | case 'C': | |
321 | docache = 0; | |
322 | break; | |
323 | case 's': | |
324 | reqssl = 1; | |
325 | break; | |
326 | case 'r': | |
327 | realm = optarg; | |
328 | break; | |
329 | default: | |
330 | usage(stderr); | |
331 | return(1); | |
332 | } | |
333 | } | |
334 | bufinit(cbuf); | |
335 | for(i = optind; i < argc; i++) { | |
336 | if(!strcmp(argv[i], "--")) | |
337 | break; | |
338 | bufadd(cbuf, argv[i]); | |
339 | } | |
340 | if((cbuf.d == 0) || (i == argc)) { | |
341 | usage(stderr); | |
342 | return(1); | |
343 | } | |
344 | bufadd(cbuf, NULL); | |
345 | authcmd = cbuf.b; | |
346 | i++; | |
347 | if(i == argc) { | |
348 | usage(stderr); | |
349 | return(1); | |
350 | } | |
351 | if((ch = stdmkchild(argv + i, NULL, NULL)) < 0) { | |
352 | flog(LOG_ERR, "htextauth: could not fork child: %s", strerror(errno)); | |
353 | return(1); | |
354 | } | |
355 | signal(SIGCHLD, sighandler); | |
356 | signal(SIGPIPE, sighandler); | |
357 | while(1) { | |
358 | memset(pfd, 0, sizeof(pfd)); | |
359 | pfd[0].fd = 0; | |
360 | pfd[0].events = POLLIN; | |
361 | pfd[1].fd = ch; | |
362 | pfd[1].events = POLLHUP; | |
363 | if((ret = poll(pfd, 2, -1)) < 0) { | |
364 | if(errno != EINTR) { | |
365 | flog(LOG_ERR, "htextauth: error in poll: %s", strerror(errno)); | |
366 | exit(1); | |
367 | } | |
368 | } | |
369 | if(pfd[0].revents) { | |
370 | if((fd = recvreq(0, &req)) < 0) { | |
371 | if(errno == 0) | |
372 | break; | |
373 | flog(LOG_ERR, "htextauth: error in recvreq: %s", strerror(errno)); | |
374 | exit(1); | |
375 | } | |
376 | serve(req, fd); | |
377 | freehthead(req); | |
378 | close(fd); | |
379 | } | |
380 | if(pfd[1].revents & POLLHUP) | |
381 | break; | |
382 | } | |
383 | cleancache(1); | |
384 | return(0); | |
385 | } |