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2b0cc3d3 EM |
1 | /* authd/providers/ident.c - ident lookup provider for authd |
2 | * Copyright (c) 2016 Elizabeth Myers <elizabeth@interlinked.me> | |
3 | * | |
4 | * Permission to use, copy, modify, and/or distribute this software for any | |
5 | * purpose with or without fee is hereby granted, provided that the above | |
6 | * copyright notice and this permission notice is present in all copies. | |
7 | * | |
8 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
9 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
10 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
11 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, | |
12 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
13 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
14 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
15 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
16 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
17 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
18 | * POSSIBILITY OF SUCH DAMAGE. | |
19 | */ | |
20 | ||
21 | #include "stdinc.h" | |
22 | #include "match.h" | |
23 | #include "authd.h" | |
24 | #include "provider.h" | |
25 | #include "res.h" | |
26 | ||
27 | #define IDENT_BUFSIZE 128 | |
28 | ||
29 | struct ident_query | |
30 | { | |
2b0cc3d3 EM |
31 | time_t timeout; /* Timeout interval */ |
32 | rb_fde_t *F; /* Our FD */ | |
33 | }; | |
34 | ||
35 | /* Goinked from old s_auth.c --Elizafox */ | |
36 | static const char *messages[] = | |
37 | { | |
38 | ":*** Checking Ident", | |
39 | ":*** Got Ident response", | |
40 | ":*** No Ident response", | |
41 | }; | |
42 | ||
43 | typedef enum | |
44 | { | |
45 | REPORT_LOOKUP, | |
46 | REPORT_FOUND, | |
47 | REPORT_FAIL, | |
48 | } ident_message; | |
49 | ||
50 | static EVH timeout_ident_queries_event; | |
51 | static CNCB ident_connected; | |
52 | static PF read_ident_reply; | |
53 | ||
3e875f62 EM |
54 | static void client_fail(struct auth_client *auth, ident_message message); |
55 | static void client_success(struct auth_client *auth); | |
2b0cc3d3 EM |
56 | static char * get_valid_ident(char *buf); |
57 | ||
2b0cc3d3 EM |
58 | static struct ev_entry *timeout_ev; |
59 | static int ident_timeout = 5; | |
60 | ||
61 | ||
62 | bool ident_init(void) | |
63 | { | |
64 | timeout_ev = rb_event_addish("timeout_ident_queries_event", timeout_ident_queries_event, NULL, 1); | |
65 | return (timeout_ev != NULL); | |
66 | } | |
67 | ||
68 | void ident_destroy(void) | |
69 | { | |
3e875f62 | 70 | struct auth_client *auth; |
aba29d5a | 71 | rb_dictionary_iter iter; |
2b0cc3d3 EM |
72 | |
73 | /* Nuke all ident queries */ | |
ab33d608 | 74 | RB_DICTIONARY_FOREACH(auth, &iter, auth_clients) |
2b0cc3d3 | 75 | { |
3e875f62 EM |
76 | if(auth->data[PROVIDER_IDENT] != NULL) |
77 | client_fail(auth, REPORT_FAIL); | |
2b0cc3d3 EM |
78 | } |
79 | } | |
80 | ||
81 | bool ident_start(struct auth_client *auth) | |
82 | { | |
83 | struct ident_query *query = rb_malloc(sizeof(struct ident_query)); | |
84 | struct rb_sockaddr_storage l_addr, c_addr; | |
85 | int family; | |
86 | rb_fde_t *F; | |
87 | ||
3e875f62 | 88 | auth->data[PROVIDER_IDENT] = query; |
2b0cc3d3 EM |
89 | query->timeout = rb_current_time() + ident_timeout; |
90 | ||
91 | if((F = rb_socket(family, SOCK_STREAM, 0, "ident")) == NULL) | |
92 | { | |
3e875f62 | 93 | client_fail(auth, REPORT_FAIL); |
2b0cc3d3 EM |
94 | return true; /* Not a fatal error */ |
95 | } | |
96 | ||
97 | query->F = F; | |
98 | ||
99 | /* Build sockaddr_storages for rb_connect_tcp below */ | |
6cd3964d EM |
100 | memcpy(&l_addr, auth->l_addr, sizeof(l_addr)); |
101 | memcpy(&c_addr, auth->c_addr, sizeof(c_addr)); | |
2b0cc3d3 EM |
102 | |
103 | /* Set the ports correctly */ | |
104 | #ifdef RB_IPV6 | |
105 | if(GET_SS_FAMILY(&l_addr) == AF_INET6) | |
106 | ((struct sockaddr_in6 *)&l_addr)->sin6_port = 0; | |
107 | else | |
108 | #endif | |
109 | ((struct sockaddr_in *)&l_addr)->sin_port = 0; | |
110 | ||
111 | #ifdef RB_IPV6 | |
112 | if(GET_SS_FAMILY(&c_addr) == AF_INET6) | |
113 | ((struct sockaddr_in6 *)&c_addr)->sin6_port = htons(113); | |
114 | else | |
115 | #endif | |
116 | ((struct sockaddr_in *)&c_addr)->sin_port = htons(113); | |
117 | ||
118 | rb_connect_tcp(F, (struct sockaddr *)&c_addr, | |
119 | (struct sockaddr *)&l_addr, | |
120 | GET_SS_LEN(&l_addr), ident_connected, | |
121 | query, ident_timeout); | |
122 | ||
2b0cc3d3 | 123 | notice_client(auth, messages[REPORT_LOOKUP]); |
3e875f62 | 124 | set_provider(auth, PROVIDER_IDENT); |
2b0cc3d3 EM |
125 | |
126 | return true; | |
127 | } | |
128 | ||
129 | void ident_cancel(struct auth_client *auth) | |
130 | { | |
3e875f62 | 131 | struct ident_query *query = auth->data[PROVIDER_IDENT]; |
2b0cc3d3 | 132 | |
3e875f62 EM |
133 | if(query != NULL) |
134 | client_fail(auth, REPORT_FAIL); | |
2b0cc3d3 EM |
135 | } |
136 | ||
137 | /* Timeout outstanding queries */ | |
138 | static void timeout_ident_queries_event(void *notused) | |
139 | { | |
3e875f62 | 140 | struct auth_client *auth; |
aba29d5a | 141 | rb_dictionary_iter iter; |
2b0cc3d3 | 142 | |
ab33d608 | 143 | RB_DICTIONARY_FOREACH(auth, &iter, auth_clients) |
2b0cc3d3 | 144 | { |
3e875f62 | 145 | struct ident_query *query = auth->data[PROVIDER_IDENT]; |
2b0cc3d3 | 146 | |
3e875f62 EM |
147 | if(query != NULL && query->timeout < rb_current_time()) |
148 | client_fail(auth, REPORT_FAIL); | |
2b0cc3d3 EM |
149 | } |
150 | } | |
151 | ||
152 | /* | |
153 | * ident_connected() - deal with the result of rb_connect_tcp() | |
154 | * | |
155 | * If the connection failed, we simply close the auth fd and report | |
156 | * a failure. If the connection suceeded send the ident server a query | |
157 | * giving "theirport , ourport". The write is only attempted *once* so | |
158 | * it is deemed to be a fail if the entire write doesn't write all the | |
159 | * data given. This shouldnt be a problem since the socket should have | |
160 | * a write buffer far greater than this message to store it in should | |
161 | * problems arise. -avalon | |
162 | */ | |
163 | static void ident_connected(rb_fde_t *F, int error, void *data) | |
164 | { | |
3e875f62 EM |
165 | struct auth_client *auth = data; |
166 | struct ident_query *query = auth->data[PROVIDER_IDENT]; | |
2b0cc3d3 EM |
167 | char authbuf[32]; |
168 | int authlen; | |
169 | ||
170 | /* Check the error */ | |
171 | if(error != RB_OK) | |
172 | { | |
173 | /* We had an error during connection :( */ | |
3e875f62 | 174 | client_fail(auth, REPORT_FAIL); |
2b0cc3d3 EM |
175 | return; |
176 | } | |
177 | ||
178 | snprintf(authbuf, sizeof(authbuf), "%u , %u\r\n", | |
179 | auth->c_port, auth->l_port); | |
180 | authlen = strlen(authbuf); | |
181 | ||
182 | if(rb_write(query->F, authbuf, authlen) != authlen) | |
183 | { | |
3e875f62 | 184 | client_fail(auth, REPORT_FAIL); |
2b0cc3d3 EM |
185 | return; |
186 | } | |
187 | ||
3e875f62 | 188 | read_ident_reply(query->F, auth); |
2b0cc3d3 EM |
189 | } |
190 | ||
191 | static void | |
192 | read_ident_reply(rb_fde_t *F, void *data) | |
193 | { | |
3e875f62 EM |
194 | struct auth_client *auth = data; |
195 | struct ident_query *query = auth->data[PROVIDER_IDENT]; | |
2b0cc3d3 EM |
196 | char *s = NULL; |
197 | char *t = NULL; | |
198 | int len; | |
199 | int count; | |
200 | char buf[IDENT_BUFSIZE + 1]; /* buffer to read auth reply into */ | |
201 | ||
202 | len = rb_read(F, buf, IDENT_BUFSIZE); | |
203 | if(len < 0 && rb_ignore_errno(errno)) | |
204 | { | |
205 | rb_setselect(F, RB_SELECT_READ, read_ident_reply, query); | |
206 | return; | |
207 | } | |
208 | ||
209 | if(len > 0) | |
210 | { | |
211 | buf[len] = '\0'; | |
212 | ||
213 | if((s = get_valid_ident(buf))) | |
214 | { | |
215 | t = auth->username; | |
216 | ||
217 | while (*s == '~' || *s == '^') | |
218 | s++; | |
219 | ||
220 | for (count = USERLEN; *s && count; s++) | |
221 | { | |
222 | if(*s == '@') | |
223 | { | |
224 | break; | |
225 | } | |
226 | if(*s != ' ' && *s != ':' && *s != '[') | |
227 | { | |
228 | *t++ = *s; | |
229 | count--; | |
230 | } | |
231 | } | |
232 | *t = '\0'; | |
233 | } | |
234 | } | |
235 | ||
236 | if(s == NULL) | |
3e875f62 | 237 | client_fail(auth, REPORT_FAIL); |
2b0cc3d3 | 238 | else |
3e875f62 | 239 | client_success(auth); |
2b0cc3d3 EM |
240 | } |
241 | ||
3e875f62 | 242 | static void client_fail(struct auth_client *auth, ident_message report) |
2b0cc3d3 | 243 | { |
3e875f62 | 244 | struct ident_query *query = auth->data[PROVIDER_IDENT]; |
2b0cc3d3 | 245 | |
3e875f62 | 246 | rb_strlcpy(auth->username, "*", sizeof(auth->username)); |
2b0cc3d3 | 247 | |
3e875f62 EM |
248 | rb_close(query->F); |
249 | rb_free(query); | |
250 | auth->data[PROVIDER_IDENT] = NULL; | |
2b0cc3d3 | 251 | |
3e875f62 EM |
252 | notice_client(auth, messages[report]); |
253 | provider_done(auth, PROVIDER_IDENT); | |
2b0cc3d3 EM |
254 | } |
255 | ||
3e875f62 | 256 | static void client_success(struct auth_client *auth) |
2b0cc3d3 | 257 | { |
3e875f62 | 258 | struct ident_query *query = auth->data[PROVIDER_IDENT]; |
2b0cc3d3 | 259 | |
3e875f62 EM |
260 | rb_close(query->F); |
261 | rb_free(query); | |
262 | auth->data[PROVIDER_IDENT] = NULL; | |
2b0cc3d3 | 263 | |
3e875f62 EM |
264 | notice_client(auth, messages[REPORT_FOUND]); |
265 | provider_done(auth, PROVIDER_IDENT); | |
2b0cc3d3 EM |
266 | } |
267 | ||
268 | /* get_valid_ident | |
269 | * parse ident query reply from identd server | |
270 | * | |
271 | * Torn out of old s_auth.c because there was nothing wrong with it | |
272 | * --Elizafox | |
273 | * | |
274 | * Inputs - pointer to ident buf | |
275 | * Outputs - NULL if no valid ident found, otherwise pointer to name | |
276 | * Side effects - None | |
277 | */ | |
278 | static char * | |
279 | get_valid_ident(char *buf) | |
280 | { | |
281 | int remp = 0; | |
282 | int locp = 0; | |
283 | char *colon1Ptr; | |
284 | char *colon2Ptr; | |
285 | char *colon3Ptr; | |
286 | char *commaPtr; | |
287 | char *remotePortString; | |
288 | ||
289 | /* All this to get rid of a sscanf() fun. */ | |
290 | remotePortString = buf; | |
291 | ||
292 | colon1Ptr = strchr(remotePortString, ':'); | |
293 | if(!colon1Ptr) | |
294 | return 0; | |
295 | ||
296 | *colon1Ptr = '\0'; | |
297 | colon1Ptr++; | |
298 | colon2Ptr = strchr(colon1Ptr, ':'); | |
299 | if(!colon2Ptr) | |
300 | return 0; | |
301 | ||
302 | *colon2Ptr = '\0'; | |
303 | colon2Ptr++; | |
304 | commaPtr = strchr(remotePortString, ','); | |
305 | ||
306 | if(!commaPtr) | |
307 | return 0; | |
308 | ||
309 | *commaPtr = '\0'; | |
310 | commaPtr++; | |
311 | ||
312 | remp = atoi(remotePortString); | |
313 | if(!remp) | |
314 | return 0; | |
315 | ||
316 | locp = atoi(commaPtr); | |
317 | if(!locp) | |
318 | return 0; | |
319 | ||
320 | /* look for USERID bordered by first pair of colons */ | |
321 | if(!strstr(colon1Ptr, "USERID")) | |
322 | return 0; | |
323 | ||
324 | colon3Ptr = strchr(colon2Ptr, ':'); | |
325 | if(!colon3Ptr) | |
326 | return 0; | |
327 | ||
328 | *colon3Ptr = '\0'; | |
329 | colon3Ptr++; | |
330 | return (colon3Ptr); | |
331 | } | |
332 | ||
333 | ||
334 | struct auth_provider ident_provider = | |
335 | { | |
336 | .id = PROVIDER_IDENT, | |
337 | .init = ident_init, | |
338 | .destroy = ident_destroy, | |
339 | .start = ident_start, | |
340 | .cancel = ident_cancel, | |
341 | .completed = NULL, | |
342 | }; |