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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 | ||
85 | static void cleancache(int complete) | |
86 | { | |
87 | struct cache *c, *n; | |
88 | ||
89 | for(c = cache; c != NULL; c = n) { | |
90 | n = c->next; | |
91 | if(complete || (now - c->lastuse > 3600)) { | |
92 | if(c->next) | |
93 | c->next->prev = c->prev; | |
94 | if(c->prev) | |
95 | c->prev->next = c->next; | |
96 | if(c == cache) | |
97 | cache = c->next; | |
98 | memset(c->pass, 0, strlen(c->pass)); | |
99 | free(c->user); | |
100 | free(c->pass); | |
101 | free(c); | |
102 | } | |
103 | } | |
104 | lastclean = now; | |
105 | } | |
106 | ||
107 | static int ckcache(char *user, char *pass) | |
108 | { | |
109 | struct cache *c; | |
110 | ||
111 | for(c = cache; c != NULL; c = c->next) { | |
112 | if(!strcmp(user, c->user) && !strcmp(pass, c->pass)) { | |
113 | c->lastuse = now; | |
114 | return(1); | |
115 | } | |
116 | } | |
117 | return(0); | |
118 | } | |
119 | ||
120 | static struct cache *addcache(char *user, char *pass) | |
121 | { | |
122 | struct cache *c; | |
123 | ||
124 | omalloc(c); | |
125 | c->user = sstrdup(user); | |
126 | c->pass = sstrdup(pass); | |
127 | c->lastuse = now; | |
128 | c->next = cache; | |
129 | if(cache != NULL) | |
130 | cache->prev = c; | |
131 | cache = c; | |
132 | return(c); | |
133 | } | |
134 | ||
135 | static void serve2(struct hthead *req, int fd, char *user) | |
136 | { | |
137 | headappheader(req, "X-Ash-Remote-User", user); | |
138 | if(sendreq(ch, req, fd)) { | |
139 | flog(LOG_ERR, "htextauth: could not pass request to child: %s", strerror(errno)); | |
140 | exit(1); | |
141 | } | |
142 | } | |
143 | ||
144 | static void serve(struct hthead *req, int fd) | |
145 | { | |
146 | char *raw, *dec, *p; | |
147 | size_t declen; | |
148 | ||
149 | now = time(NULL); | |
b4fda020 | 150 | dec = NULL; |
baaabaf7 FT |
151 | if(reqssl && (((raw = getheader(req, "X-Ash-Protocol")) == NULL) || strcmp(raw, "https"))) { |
152 | simpleerror(fd, 403, "Forbidden", "The requested resource must be requested over HTTPS."); | |
153 | goto out; | |
154 | } | |
baaabaf7 FT |
155 | if(((raw = getheader(req, "Authorization")) == NULL) || strncasecmp(raw, "basic ", 6)) { |
156 | reqauth(req, fd); | |
157 | goto out; | |
158 | } | |
159 | if((dec = base64decode(raw + 6, &declen)) == NULL) { | |
160 | simpleerror(fd, 400, "Invalid request", "The authentication data is not proper base64."); | |
161 | goto out; | |
162 | } | |
163 | memset(raw, 0, strlen(raw)); | |
164 | headrmheader(req, "Authorization"); | |
165 | if((p = strchr(dec, ':')) == NULL) { | |
166 | simpleerror(fd, 400, "Invalid request", "The authentication data is invalid."); | |
167 | goto out; | |
168 | } | |
169 | *(p++) = 0; | |
170 | if(docache && ckcache(dec, p)) { | |
171 | serve2(req, fd, dec); | |
172 | goto out; | |
173 | } | |
174 | if(auth(req, fd, dec, p)) { | |
175 | if(docache) | |
176 | addcache(dec, p); | |
177 | serve2(req, fd, dec); | |
178 | goto out; | |
179 | } | |
180 | ||
181 | out: | |
182 | if(dec != NULL) { | |
183 | memset(dec, 0, declen); | |
184 | free(dec); | |
185 | } | |
186 | if(docache && (now - lastclean > 60)) | |
187 | cleancache(0); | |
188 | } | |
189 | ||
190 | static int auth(struct hthead *req, int fd, char *user, char *pass) | |
191 | { | |
192 | int i, rv, status; | |
193 | ssize_t len; | |
194 | char *msg; | |
195 | struct charbuf ebuf; | |
196 | pid_t pid; | |
197 | int pfd[2], efd[2]; | |
198 | FILE *out; | |
199 | ||
200 | rv = 0; | |
201 | if(strchr(user, '\n') || strchr(pass, '\n')) { | |
202 | simpleerror(fd, 401, "Invalid authentication", "The supplied credentials are invalid."); | |
203 | return(0); | |
204 | } | |
205 | msg = "The supplied credentials are invalid."; | |
206 | pipe(pfd); | |
207 | pipe(efd); | |
208 | if((pid = fork()) < 0) { | |
209 | flog(LOG_ERR, "htextauth: could not fork: %s", strerror(errno)); | |
210 | simpleerror(fd, 500, "Server Error", "An internal error occurred."); | |
211 | close(pfd[0]); close(pfd[1]); | |
212 | close(efd[0]); close(efd[1]); | |
213 | return(0); | |
214 | } | |
215 | if(pid == 0) { | |
216 | dup2(pfd[0], 0); | |
217 | dup2(efd[1], 1); | |
218 | for(i = 3; i < FD_SETSIZE; i++) | |
219 | close(i); | |
220 | execvp(authcmd[0], authcmd); | |
221 | flog(LOG_ERR, "htextauth: could not exec %s: %s", authcmd[0], strerror(errno)); | |
222 | exit(127); | |
223 | } | |
224 | close(pfd[0]); | |
225 | close(efd[1]); | |
226 | out = fdopen(pfd[1], "w"); | |
227 | fprintf(out, "%s\n", user); | |
228 | fprintf(out, "%s\n", pass); | |
229 | fclose(out); | |
230 | bufinit(ebuf); | |
231 | while(1) { | |
232 | sizebuf(ebuf, ebuf.d + 128); | |
233 | len = read(efd[0], ebuf.b + ebuf.d, ebuf.s - ebuf.d); | |
234 | if(len < 0) { | |
235 | if(errno == EINTR) | |
236 | continue; | |
237 | break; | |
238 | } else if(len == 0) { | |
239 | break; | |
240 | } | |
241 | ebuf.d += len; | |
242 | } | |
243 | if(ebuf.d > 0) { | |
244 | bufadd(ebuf, 0); | |
245 | msg = ebuf.b; | |
246 | } | |
247 | close(efd[0]); | |
248 | if(waitpid(pid, &status, 0) < 0) { | |
249 | flog(LOG_ERR, "htextauth: could not wait: %s", strerror(errno)); | |
250 | simpleerror(fd, 500, "Server Error", "An internal error occurred."); | |
251 | buffree(ebuf); | |
252 | return(0); | |
253 | } | |
254 | if(WIFEXITED(status) && (WEXITSTATUS(status) == 0)) | |
255 | rv = 1; | |
256 | else | |
257 | simpleerror(fd, 401, "Invalid authentication", msg); | |
258 | buffree(ebuf); | |
259 | return(rv); | |
260 | } | |
261 | ||
262 | static void usage(FILE *out) | |
263 | { | |
264 | fprintf(out, "usage: htextauth [-hCs] [-r REALM] AUTHCMD [ARGS...] -- CHILD [ARGS...]\n"); | |
265 | } | |
266 | ||
267 | static void sighandler(int sig) | |
268 | { | |
269 | } | |
270 | ||
271 | int main(int argc, char **argv) | |
272 | { | |
273 | int i, c, ret; | |
274 | struct charvbuf cbuf; | |
275 | struct pollfd pfd[2]; | |
276 | struct hthead *req; | |
277 | int fd; | |
278 | ||
279 | while((c = getopt(argc, argv, "+hCsr:")) >= 0) { | |
280 | switch(c) { | |
281 | case 'h': | |
282 | usage(stdout); | |
283 | return(0); | |
284 | case 'C': | |
285 | docache = 0; | |
286 | break; | |
287 | case 's': | |
288 | reqssl = 1; | |
289 | break; | |
290 | case 'r': | |
291 | realm = optarg; | |
292 | break; | |
293 | default: | |
294 | usage(stderr); | |
295 | return(1); | |
296 | } | |
297 | } | |
298 | bufinit(cbuf); | |
299 | for(i = optind; i < argc; i++) { | |
300 | if(!strcmp(argv[i], "--")) | |
301 | break; | |
302 | bufadd(cbuf, argv[i]); | |
303 | } | |
304 | if((cbuf.d == 0) || (i == argc)) { | |
305 | usage(stderr); | |
306 | return(1); | |
307 | } | |
308 | bufadd(cbuf, NULL); | |
309 | authcmd = cbuf.b; | |
310 | i++; | |
311 | if(i == argc) { | |
312 | usage(stderr); | |
313 | return(1); | |
314 | } | |
315 | if((ch = stdmkchild(argv + i, NULL, NULL)) < 0) { | |
316 | flog(LOG_ERR, "htextauth: could not fork child: %s", strerror(errno)); | |
317 | return(1); | |
318 | } | |
319 | signal(SIGCHLD, sighandler); | |
320 | signal(SIGPIPE, sighandler); | |
321 | while(1) { | |
322 | memset(pfd, 0, sizeof(pfd)); | |
323 | pfd[0].fd = 0; | |
324 | pfd[0].events = POLLIN; | |
325 | pfd[1].fd = ch; | |
326 | pfd[1].events = POLLHUP; | |
327 | if((ret = poll(pfd, 2, -1)) < 0) { | |
328 | if(errno != EINTR) { | |
329 | flog(LOG_ERR, "htextauth: error in poll: %s", strerror(errno)); | |
330 | exit(1); | |
331 | } | |
332 | } | |
333 | if(pfd[0].revents) { | |
334 | if((fd = recvreq(0, &req)) < 0) { | |
335 | if(errno == 0) | |
336 | break; | |
337 | flog(LOG_ERR, "htextauth: error in recvreq: %s", strerror(errno)); | |
338 | exit(1); | |
339 | } | |
340 | serve(req, fd); | |
341 | freehthead(req); | |
342 | close(fd); | |
343 | } | |
344 | if(pfd[1].revents & POLLHUP) | |
345 | break; | |
346 | } | |
347 | cleancache(1); | |
348 | return(0); | |
349 | } |