Allow any assignment or equality operator in rlm_sql
[freeradius.git] / src / modules / rlm_sql / sql.c
1 /*
2  *  sql.c               rlm_sql - FreeRADIUS SQL Module
3  *              Main code directly taken from ICRADIUS
4  *
5  * Version:     $Id$
6  *
7  *   This program is free software; you can redistribute it and/or modify
8  *   it under the terms of the GNU General Public License as published by
9  *   the Free Software Foundation; either version 2 of the License, or
10  *   (at your option) any later version.
11  *
12  *   This program is distributed in the hope that it will be useful,
13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  *   GNU General Public License for more details.
16  *
17  *   You should have received a copy of the GNU General Public License
18  *   along with this program; if not, write to the Free Software
19  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
20  *
21  * Copyright 2001,2006  The FreeRADIUS server project
22  * Copyright 2000  Mike Machado <mike@innercite.com>
23  * Copyright 2000  Alan DeKok <aland@ox.org>
24  * Copyright 2001  Chad Miller <cmiller@surfsouth.com>
25  */
26
27 RCSID("$Id$")
28
29 #include        <freeradius-devel/radiusd.h>
30 #include        <freeradius-devel/rad_assert.h>
31
32 #include        <sys/file.h>
33 #include        <sys/stat.h>
34
35 #include        <ctype.h>
36
37 #include        "rlm_sql.h"
38
39 #ifdef HAVE_PTHREAD_H
40 #endif
41
42 /*
43  *      Translate rlm_sql rcodes to humanly
44  *      readable reason strings.
45  */
46 const FR_NAME_NUMBER sql_rcode_table[] = {
47         { "success",            RLM_SQL_OK              },
48         { "need alt query",     RLM_SQL_ALT_QUERY       },
49         { "server error",       RLM_SQL_ERROR           },
50         { "query invalid",      RLM_SQL_QUERY_INVALID   },
51         { "no connection",      RLM_SQL_RECONNECT       },
52         { NULL, 0 }
53 };
54
55
56 void *mod_conn_create(TALLOC_CTX *ctx, void *instance)
57 {
58         int rcode;
59         rlm_sql_t *inst = instance;
60         rlm_sql_handle_t *handle;
61
62         /*
63          *      Connections cannot be alloced from the inst or
64          *      pool contexts due to threading issues.
65          */
66         handle = talloc_zero(ctx, rlm_sql_handle_t);
67         if (!handle) return NULL;
68
69         handle->log_ctx = talloc_pool(handle, 2048);
70         if (!handle->log_ctx) {
71                 talloc_free(handle);
72                 return NULL;
73         }
74
75         /*
76          *      Handle requires a pointer to the SQL inst so the
77          *      destructor has access to the module configuration.
78          */
79         handle->inst = inst;
80
81         rcode = (inst->module->sql_socket_init)(handle, inst->config);
82         if (rcode != 0) {
83         fail:
84                 /*
85                  *      Destroy any half opened connections.
86                  */
87                 talloc_free(handle);
88                 return NULL;
89         }
90
91         if (inst->config->connect_query) {
92                 if (rlm_sql_select_query(inst, NULL, &handle, inst->config->connect_query) != RLM_SQL_OK) goto fail;
93                 (inst->module->sql_finish_select_query)(handle, inst->config);
94         }
95
96         return handle;
97 }
98
99 /*************************************************************************
100  *
101  *      Function: sql_fr_pair_list_afrom_str
102  *
103  *      Purpose: Read entries from the database and fill VALUE_PAIR structures
104  *
105  *************************************************************************/
106 int sql_fr_pair_list_afrom_str(TALLOC_CTX *ctx, REQUEST *request, VALUE_PAIR **head, rlm_sql_row_t row)
107 {
108         VALUE_PAIR *vp;
109         char const *ptr, *value;
110         char buf[MAX_STRING_LEN];
111         char do_xlat = 0;
112         FR_TOKEN token, op = T_EOL;
113
114         /*
115          *      Verify the 'Attribute' field
116          */
117         if (!row[2] || row[2][0] == '\0') {
118                 REDEBUG("The 'Attribute' field is empty or NULL, skipping the entire row");
119                 return -1;
120         }
121
122         /*
123          *      Verify the 'op' field
124          */
125         if (row[4] != NULL && row[4][0] != '\0') {
126                 ptr = row[4];
127                 op = gettoken(&ptr, buf, sizeof(buf), false);
128                 if (!fr_assignment_op[op] && !fr_equality_op[op]) {
129                         REDEBUG("Invalid op \"%s\" for attribute %s", row[4], row[2]);
130                         return -1;
131                 }
132
133         } else {
134                 /*
135                  *  Complain about empty or invalid 'op' field
136                  */
137                 op = T_OP_CMP_EQ;
138                 REDEBUG("The 'op' field for attribute '%s = %s' is NULL, or non-existent.", row[2], row[3]);
139                 REDEBUG("You MUST FIX THIS if you want the configuration to behave as you expect");
140         }
141
142         /*
143          *      The 'Value' field may be empty or NULL
144          */
145         value = row[3];
146         /*
147          *      If we have a new-style quoted string, where the
148          *      *entire* string is quoted, do xlat's.
149          */
150         if (row[3] != NULL &&
151            ((row[3][0] == '\'') || (row[3][0] == '`') || (row[3][0] == '"')) &&
152            (row[3][0] == row[3][strlen(row[3])-1])) {
153
154                 token = gettoken(&value, buf, sizeof(buf), false);
155                 switch (token) {
156                 /*
157                  *      Take the unquoted string.
158                  */
159                 case T_SINGLE_QUOTED_STRING:
160                 case T_DOUBLE_QUOTED_STRING:
161                         value = buf;
162                         break;
163
164                 /*
165                  *      Mark the pair to be allocated later.
166                  */
167                 case T_BACK_QUOTED_STRING:
168                         value = NULL;
169                         do_xlat = 1;
170                         break;
171
172                 /*
173                  *      Keep the original string.
174                  */
175                 default:
176                         value = row[3];
177                         break;
178                 }
179         }
180
181         /*
182          *      Create the pair
183          */
184         vp = fr_pair_make(ctx, NULL, row[2], NULL, op);
185         if (!vp) {
186                 REDEBUG("Failed to create the pair: %s", fr_strerror());
187                 return -1;
188         }
189
190         if (do_xlat) {
191                 if (fr_pair_mark_xlat(vp, value) < 0) {
192                         REDEBUG("Error marking pair for xlat");
193
194                         talloc_free(vp);
195                         return -1;
196                 }
197         } else {
198                 if (fr_pair_value_from_str(vp, value, -1) < 0) {
199                         REDEBUG("Error parsing value: %s", fr_strerror());
200
201                         talloc_free(vp);
202                         return -1;
203                 }
204         }
205
206         /*
207          *      Add the pair into the packet
208          */
209         fr_pair_add(head, vp);
210         return 0;
211 }
212
213 /** Call the driver's sql_fetch_row function
214  *
215  * Calls the driver's sql_fetch_row logging any errors. On success, will
216  * write row data to (*handle)->row.
217  *
218  * @param inst Instance of rlm_sql.
219  * @param request The Current request, may be NULL.
220  * @param handle Handle to retrieve errors for.
221  * @return on success RLM_SQL_OK, other sql_rcode_t constants on error.
222  */
223 sql_rcode_t rlm_sql_fetch_row(rlm_sql_t *inst, REQUEST *request, rlm_sql_handle_t **handle)
224 {
225         int ret;
226
227         if (!*handle || !(*handle)->conn) return RLM_SQL_ERROR;
228
229         /*
230          *      We can't implement reconnect logic here, because the caller
231          *      may require the original connection to free up queries or
232          *      result sets associated with that connection.
233          */
234         ret = (inst->module->sql_fetch_row)(*handle, inst->config);
235         if (ret < 0) {
236                 MOD_ROPTIONAL(RERROR, ERROR, "Error fetching row");
237
238                 rlm_sql_print_error(inst, request, *handle, false);
239         }
240
241         return ret;
242 }
243
244 /** Retrieve any errors from the SQL driver
245  *
246  * Retrieves errors from the driver from the last operation and writes them to
247  * to request/global log, in the ERROR, WARN, INFO and DEBUG categories.
248  *
249  * @param inst Instance of rlm_sql.
250  * @param request Current request, may be NULL.
251  * @param handle Handle to retrieve errors for.
252  * @param force_debug Force all errors to be logged as debug messages.
253  */
254 void rlm_sql_print_error(rlm_sql_t *inst, REQUEST *request, rlm_sql_handle_t *handle, bool force_debug)
255 {
256         char const      *driver;
257         sql_log_entry_t log[20];
258         size_t          num, i;
259
260         num = (inst->module->sql_error)(handle->log_ctx, log, (sizeof(log) / sizeof(*log)), handle, inst->config);
261         if (num == 0) {
262                 MOD_ROPTIONAL(RERROR, ERROR, "Unknown error");
263                 return;
264         }
265
266         driver = inst->config->sql_driver_name;
267
268         for (i = 0; i < num; i++) {
269                 if (force_debug) goto debug;
270
271                 switch (log[i].type) {
272                 case L_ERR:
273                         MOD_ROPTIONAL(RERROR, ERROR, "%s: %s", driver, log[i].msg);
274                         break;
275
276                 case L_WARN:
277                         MOD_ROPTIONAL(RWARN, WARN, "%s: %s", driver, log[i].msg);
278                         break;
279
280                 case L_INFO:
281                         MOD_ROPTIONAL(RINFO, INFO, "%s: %s", driver, log[i].msg);
282                         break;
283
284                 case L_DBG:
285                 default:
286                 debug:
287                         MOD_ROPTIONAL(RDEBUG, DEBUG, "%s: %s", driver, log[i].msg);
288                         break;
289                 }
290         }
291
292         talloc_free_children(handle->log_ctx);
293 }
294
295 /** Call the driver's sql_query method, reconnecting if necessary.
296  *
297  * @note Caller must call (inst->module->sql_finish_query)(handle, inst->config);
298  *      after they're done with the result.
299  *
300  * @param handle to query the database with. *handle should not be NULL, as this indicates
301  *      previous reconnection attempt has failed.
302  * @param request Current request.
303  * @param inst rlm_sql instance data.
304  * @param query to execute. Should not be zero length.
305  * @return RLM_SQL_OK on success, RLM_SQL_RECONNECT if a new handle is required
306  *      (also sets *handle = NULL), RLM_SQL_QUERY_INVALID/RLM_SQL_ERROR on invalid query or
307  *      connection error, RLM_SQL_ALT_QUERY on constraints violation.
308  */
309 sql_rcode_t rlm_sql_query(rlm_sql_t *inst, REQUEST *request, rlm_sql_handle_t **handle, char const *query)
310 {
311         int ret = RLM_SQL_ERROR;
312         int i, count;
313
314         /* Caller should check they have a valid handle */
315         rad_assert(*handle);
316
317         /* There's no query to run, return an error */
318         if (query[0] == '\0') {
319                 if (request) REDEBUG("Zero length query");
320                 return RLM_SQL_QUERY_INVALID;
321         }
322
323         /*
324          *  inst->pool may be NULL is this function is called by mod_conn_create.
325          */
326         count = inst->pool ? fr_connection_pool_get_num(inst->pool) : 0;
327
328         /*
329          *  Here we try with each of the existing connections, then try to create
330          *  a new connection, then give up.
331          */
332         for (i = 0; i < (count + 1); i++) {
333                 MOD_ROPTIONAL(RDEBUG2, DEBUG2, "Executing query: %s", query);
334
335                 ret = (inst->module->sql_query)(*handle, inst->config, query);
336                 switch (ret) {
337                 case RLM_SQL_OK:
338                         break;
339
340                 /*
341                  *      Run through all available sockets until we exhaust all existing
342                  *      sockets in the pool and fail to establish a *new* connection.
343                  */
344                 case RLM_SQL_RECONNECT:
345                         *handle = fr_connection_reconnect(inst->pool, *handle);
346                         /* Reconnection failed */
347                         if (!*handle) return RLM_SQL_RECONNECT;
348                         /* Reconnection succeeded, try again with the new handle */
349                         continue;
350
351                 /*
352                  *      These are bad and should make rlm_sql return invalid
353                  */
354                 case RLM_SQL_QUERY_INVALID:
355                         rlm_sql_print_error(inst, request, *handle, false);
356                         (inst->module->sql_finish_query)(*handle, inst->config);
357                         break;
358
359                 /*
360                  *      Server or client errors.
361                  *
362                  *      If the driver claims to be able to distinguish between
363                  *      duplicate row errors and other errors, and we hit a
364                  *      general error treat it as a failure.
365                  *
366                  *      Otherwise rewrite it to RLM_SQL_ALT_QUERY.
367                  */
368                 case RLM_SQL_ERROR:
369                         if (inst->module->flags & RLM_SQL_RCODE_FLAGS_ALT_QUERY) {
370                                 rlm_sql_print_error(inst, request, *handle, false);
371                                 (inst->module->sql_finish_query)(*handle, inst->config);
372                                 break;
373                         }
374                         ret = RLM_SQL_ALT_QUERY;
375                         /* FALL-THROUGH */
376
377                 /*
378                  *      Driver suggested using an alternative query
379                  */
380                 case RLM_SQL_ALT_QUERY:
381                         rlm_sql_print_error(inst, request, *handle, true);
382                         (inst->module->sql_finish_query)(*handle, inst->config);
383                         break;
384
385                 }
386
387                 return ret;
388         }
389
390         MOD_ROPTIONAL(RERROR, ERROR, "Hit reconnection limit");
391
392         return RLM_SQL_ERROR;
393 }
394
395 /** Call the driver's sql_select_query method, reconnecting if necessary.
396  *
397  * @note Caller must call (inst->module->sql_finish_select_query)(handle, inst->config);
398  *      after they're done with the result.
399  *
400  * @param inst rlm_sql instance data.
401  * @param request Current request.
402  * @param handle to query the database with. *handle should not be NULL, as this indicates
403  *        previous reconnection attempt has failed.
404  * @param query to execute. Should not be zero length.
405  * @return RLM_SQL_OK on success, RLM_SQL_RECONNECT if a new handle is required (also sets *handle = NULL),
406  *         RLM_SQL_QUERY_INVALID/RLM_SQL_ERROR on invalid query or connection error.
407  */
408 sql_rcode_t rlm_sql_select_query(rlm_sql_t *inst, REQUEST *request, rlm_sql_handle_t **handle,  char const *query)
409 {
410         int ret = RLM_SQL_ERROR;
411         int i, count;
412
413         /* Caller should check they have a valid handle */
414         rad_assert(*handle);
415
416         /* There's no query to run, return an error */
417         if (query[0] == '\0') {
418                 if (request) REDEBUG("Zero length query");
419
420                 return RLM_SQL_QUERY_INVALID;
421         }
422
423         /*
424          *  inst->pool may be NULL is this function is called by mod_conn_create.
425          */
426         count = inst->pool ? fr_connection_pool_get_num(inst->pool) : 0;
427
428         /*
429          *  For sanity, for when no connections are viable, and we can't make a new one
430          */
431         for (i = 0; i < (count + 1); i++) {
432                 MOD_ROPTIONAL(RDEBUG2, DEBUG2, "Executing select query: %s", query);
433
434                 ret = (inst->module->sql_select_query)(*handle, inst->config, query);
435                 switch (ret) {
436                 case RLM_SQL_OK:
437                         break;
438
439                 /*
440                  *      Run through all available sockets until we exhaust all existing
441                  *      sockets in the pool and fail to establish a *new* connection.
442                  */
443                 case RLM_SQL_RECONNECT:
444                         *handle = fr_connection_reconnect(inst->pool, *handle);
445                         /* Reconnection failed */
446                         if (!*handle) return RLM_SQL_RECONNECT;
447                         /* Reconnection succeeded, try again with the new handle */
448                         continue;
449
450                 case RLM_SQL_QUERY_INVALID:
451                 case RLM_SQL_ERROR:
452                 default:
453                         rlm_sql_print_error(inst, request, *handle, false);
454                         (inst->module->sql_finish_select_query)(*handle, inst->config);
455                         break;
456                 }
457
458                 return ret;
459         }
460
461         MOD_ROPTIONAL(RERROR, ERROR, "Hit reconnection limit");
462
463         return RLM_SQL_ERROR;
464 }
465
466
467 /*************************************************************************
468  *
469  *      Function: sql_getvpdata
470  *
471  *      Purpose: Get any group check or reply pairs
472  *
473  *************************************************************************/
474 int sql_getvpdata(TALLOC_CTX *ctx, rlm_sql_t *inst, REQUEST *request, rlm_sql_handle_t **handle,
475                   VALUE_PAIR **pair, char const *query)
476 {
477         rlm_sql_row_t   row;
478         int             rows = 0;
479         sql_rcode_t     rcode;
480
481         rad_assert(request);
482
483         rcode = rlm_sql_select_query(inst, request, handle, query);
484         if (rcode != RLM_SQL_OK) return -1; /* error handled by rlm_sql_select_query */
485
486         while (rlm_sql_fetch_row(inst, request, handle) == 0) {
487                 row = (*handle)->row;
488                 if (!row) break;
489                 if (sql_fr_pair_list_afrom_str(ctx, request, pair, row) != 0) {
490                         REDEBUG("Error parsing user data from database result");
491
492                         (inst->module->sql_finish_select_query)(*handle, inst->config);
493
494                         return -1;
495                 }
496                 rows++;
497         }
498         (inst->module->sql_finish_select_query)(*handle, inst->config);
499
500         return rows;
501 }
502
503 /*
504  *      Log the query to a file.
505  */
506 void rlm_sql_query_log(rlm_sql_t *inst, REQUEST *request,
507                        sql_acct_section_t *section, char const *query)
508 {
509         int fd;
510         char const *filename = NULL;
511         char *expanded = NULL;
512         size_t len;
513         bool failed = false;    /* Write the log message outside of the critical region */
514
515         filename = inst->config->logfile;
516         if (section && section->logfile) filename = section->logfile;
517
518         if (!filename || !*filename) {
519                 return;
520         }
521
522         if (radius_axlat(&expanded, request, filename, NULL, NULL) < 0) {
523                 return;
524         }
525
526         fd = exfile_open(inst->ef, filename, 0640, true);
527         if (fd < 0) {
528                 ERROR("rlm_sql (%s): Couldn't open logfile '%s': %s", inst->name,
529                       expanded, fr_syserror(errno));
530
531                 talloc_free(expanded);
532                 return;
533         }
534
535         len = strlen(query);
536         if ((write(fd, query, len) < 0) || (write(fd, ";\n", 2) < 0)) {
537                 failed = true;
538         }
539
540         if (failed) {
541                 ERROR("rlm_sql (%s): Failed writing to logfile '%s': %s", inst->name, expanded,
542                       fr_syserror(errno));
543         }
544
545         talloc_free(expanded);
546         exfile_close(inst->ef, fd);
547 }