src/modules/rlm_passwd/rlm_passwd.c

   1 /*
   2  * rlm_passwd.c
   3  *
   4  *   This program is free software; you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License as published by
   6  *   the Free Software Foundation; either version 2 of the License, or
   7  *   (at your option) any later version.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License for more details.
  13  *
  14  *   You should have received a copy of the GNU General Public License
  15  *   along with this program; if not, write to the Free Software
  16  *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  *
  18  * Copyright 2000,2006  The FreeRADIUS server project
  19  */
  20
  21 #include <freeradius-devel/ident.h>
  22 RCSID("$Id$")
  23
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <stdlib.h>
  27 #include <freeradius-devel/autoconf.h>
  28 #include <freeradius-devel/radiusd.h>
  29 #include <freeradius-devel/modules.h>
  30
  31
  32 struct mypasswd {
  33         struct mypasswd *next;
  34         char *listflag;
  35         char *field[1];
  36 };
  37
  38 struct hashtable {
  39         int tablesize;
  40         int keyfield;
  41         int nfields;
  42         int islist;
  43         int ignorenis;
  44         char * filename;
  45         struct mypasswd **table;
  46         struct mypasswd *last_found;
  47         char buffer[1024];
  48         FILE *fp;
  49         char delimiter;
  50 };
  51
  52
  53 #ifdef TEST
  54
  55 #define rad_malloc(s) malloc(s)
  56
  57 void printpw(struct mypasswd *pw, int nfields){
  58   int i;
  59   if (pw) {
  60         for( i = 0; i < nfields; i++ ) printf("%s:", pw->field[i]);
  61         printf("\n");
  62   }
  63   else printf ("Not found\n");
  64   fflush(stdout);
  65 }
  66 #endif
  67
  68
  69 static struct mypasswd * mypasswd_malloc(const char* buffer, int nfields, int* len)
  70 {
  71         struct mypasswd *t;
  72         /* reserve memory for (struct mypasswd) + listflag (nfields * sizeof (char*)) +
  73         ** fields (nfields * sizeof (char)) + strlen (inst->format) + 1 */
  74
  75         *len=sizeof (struct mypasswd) + nfields * sizeof (char*) + nfields * sizeof (char ) + strlen(buffer) + 1;
  76         t = (struct mypasswd *) rad_malloc(*len);
  77         if (t) memset(t, 0, *len);
  78         return (t);
  79 }
  80
  81 static int string_to_entry(const char* string, int nfields, char delimiter,
  82         struct mypasswd *passwd, size_t bufferlen)
  83 {
  84         char *str;
  85         size_t len, i;
  86         int fn=0;
  87         char *data_beg;
  88
  89
  90         len = strlen(string);
  91         if(!len) return 0;
  92         if (string[len-1] == '\n') len--;
  93         if(!len) return 0;
  94         if (string[len-1] == '\r') len--;
  95         if(!len) return 0;
  96         if (!len || !passwd ||
  97             bufferlen < (len + nfields * sizeof (char*) + nfields * sizeof (char) + sizeof (struct mypasswd) + 1) ) return 0;
  98         passwd->next = NULL;
  99         data_beg=(char *)passwd + sizeof(struct mypasswd);
 100         str = data_beg + nfields * sizeof (char) + nfields * sizeof (char*);
 101         memcpy (str, string, len);
 102         str[len] = 0;
 103         passwd->field[fn++] = str;
 104         passwd->listflag = data_beg + nfields * sizeof (char *);
 105         for(i=0; i < len; i++){
 106                 if (str[i] == delimiter) {
 107                         str[i] = 0;
 108                         passwd->field[fn++] = str + i + 1;
 109                         if (fn == nfields) break;
 110                 }
 111         }
 112         for (; fn < nfields; fn++) passwd->field[fn] = NULL;
 113         return len + nfields * sizeof (char) + nfields * sizeof (char*) + sizeof (struct mypasswd) + 1;
 114 }
 115
 116
 117 static void destroy_password (struct mypasswd * pass)
 118 {
 119         struct mypasswd *p;
 120         while ((p=pass)!=NULL) {
 121                 pass = pass->next;
 122                 free(p);
 123         }
 124 }
 125
 126
 127 static unsigned int hash(const unsigned char * username, unsigned int tablesize)
 128 {
 129         int h=1;
 130         while (*username) {
 131                 h = h * 7907 + *username++;
 132         }
 133         return h%tablesize;
 134 }
 135
 136 static void release_hash_table(struct hashtable * ht){
 137         int i;
 138
 139         if (ht == NULL) return;
 140         for (i = 0; i < ht->tablesize; i++)
 141                 if (ht->table[i])
 142                         destroy_password(ht->table[i]);
 143         if (ht->table) {
 144                 free(ht->table);
 145                 ht->table = NULL;
 146         }
 147         if (ht->fp) {
 148                 fclose(ht->fp);
 149                 ht->fp = NULL;
 150         }
 151         ht->tablesize = 0;
 152 }
 153
 154 static void release_ht(struct hashtable * ht){
 155         if (!ht) return;
 156         release_hash_table(ht);
 157         if (ht->filename) free(ht->filename);
 158         free(ht);
 159 }
 160
 161 static struct hashtable * build_hash_table (const char * file, int nfields,
 162         int keyfield, int islist, int tablesize, int ignorenis, char delimiter)
 163 {
 164 #define passwd ((struct mypasswd *) ht->buffer)
 165         char buffer[1024];
 166         struct hashtable* ht;
 167         size_t len;
 168         unsigned int h;
 169         struct mypasswd *hashentry, *hashentry1;
 170         char *list;
 171         char *nextlist=0;
 172         int i;
 173
 174         ht = (struct hashtable *) rad_malloc(sizeof(struct hashtable));
 175         if(!ht) {
 176                 return NULL;
 177         }
 178         memset(ht, 0, sizeof(struct hashtable));
 179         ht->filename = strdup(file);
 180         if(!ht->filename) {
 181                 free(ht);
 182                 return NULL;
 183         }
 184         ht->tablesize = tablesize;
 185         ht->nfields = nfields;
 186         ht->keyfield = keyfield;
 187         ht->islist = islist;
 188         ht->ignorenis = ignorenis;
 189         if (delimiter) ht->delimiter = delimiter;
 190         else ht->delimiter = ':';
 191         if(!tablesize) return ht;
 192         if(!(ht->fp = fopen(file,"r"))) return NULL;
 193         memset(ht->buffer, 0, 1024);
 194         ht->table = (struct mypasswd **) rad_malloc (tablesize * sizeof(struct mypasswd *));
 195         if (!ht->table) {
 196                 /*
 197                  * Unable allocate memory for hash table
 198                  * Still work without it
 199                  */
 200                 ht->tablesize = 0;
 201                 return ht;
 202         }
 203         memset(ht->table, 0, tablesize * sizeof(struct mypasswd *));
 204         while (fgets(buffer, 1024, ht->fp)) {
 205                 if(*buffer && *buffer!='\n' && (!ignorenis || (*buffer != '+' && *buffer != '-')) ){
 206                         if(!(hashentry = mypasswd_malloc(buffer, nfields, &len))){
 207                                 release_hash_table(ht);
 208                                 return ht;
 209                         }
 210                         len = string_to_entry(buffer, nfields, ht->delimiter, hashentry, len);
 211                         if(!hashentry->field[keyfield] || *hashentry->field[keyfield] == '\0') {
 212                                 free(hashentry);
 213                                 continue;
 214                         }
 215
 216                         if (islist) {
 217                                 list = hashentry->field[keyfield];
 218                                 for (nextlist = list; *nextlist && *nextlist!=','; nextlist++);
 219                                 if (*nextlist) *nextlist++ = 0;
 220                                 else nextlist = 0;
 221                         }
 222                         h = hash(hashentry->field[keyfield], tablesize);
 223                         hashentry->next = ht->table[h];
 224                         ht->table[h] = hashentry;
 225                         if (islist) {
 226                                 for(list=nextlist; nextlist; list = nextlist){
 227                                         for (nextlist = list; *nextlist && *nextlist!=','; nextlist++);
 228                                         if (*nextlist) *nextlist++ = 0;
 229                                         else nextlist = 0;
 230                                         if(!(hashentry1 = mypasswd_malloc("", nfields, &len))){
 231                                                 release_hash_table(ht);
 232                                                 return ht;
 233                                         }
 234                                         for (i=0; i<nfields; i++) hashentry1->field[i] = hashentry->field[i];
 235                                         hashentry1->field[keyfield] = list;
 236                                         h = hash(list, tablesize);
 237                                         hashentry1->next = ht->table[h];
 238                                         ht->table[h] = hashentry1;
 239                                 }
 240                         }
 241                 }
 242         }
 243         fclose(ht->fp);
 244         ht->fp = NULL;
 245         return ht;
 246 #undef passwd
 247 }
 248
 249 static struct mypasswd * get_next(char *name, struct hashtable *ht)
 250 {
 251 #define passwd ((struct mypasswd *) ht->buffer)
 252         struct mypasswd * hashentry;
 253         char buffer[1024];
 254         int len;
 255         char *list, *nextlist;
 256
 257         if (ht->tablesize > 0) {
 258                 /* get saved address of next item to check from buffer */
 259                 hashentry = ht->last_found;
 260                 for (; hashentry; hashentry = hashentry->next) {
 261                         if (!strcmp(hashentry->field[ht->keyfield], name)) {
 262                                 /* save new address */
 263                                 ht->last_found = hashentry->next;
 264                                 return hashentry;
 265                         }
 266                 }
 267                 return NULL;
 268         }
 269         /*      printf("try to find in file\n"); */
 270         if (!ht->fp) return NULL;
 271         while (fgets(buffer, 1024,ht->fp)) {
 272                 if(*buffer && *buffer!='\n' && (len = string_to_entry(buffer, ht->nfields, ht->delimiter, passwd, sizeof(ht->buffer)-1)) &&
 273                         (!ht->ignorenis || (*buffer !='-' && *buffer != '+') ) ){
 274                         if(!ht->islist) {
 275                                 if(!strcmp(passwd->field[ht->keyfield], name))
 276                                         return passwd;
 277                         }
 278                         else {
 279                                 for (list = passwd->field[ht->keyfield], nextlist = list; nextlist; list = nextlist) {
 280                                         for(nextlist = list; *nextlist && *nextlist!=','; nextlist++);
 281                                         if(!*nextlist)nextlist = 0;
 282                                         else *nextlist++ = 0;
 283                                         if(!strcmp(list, name)) return passwd;
 284                                 }
 285                         }
 286
 287                 }
 288         }
 289         fclose(ht->fp);
 290         ht->fp = NULL;
 291         return NULL;
 292 #undef passwd
 293 }
 294
 295 static struct mypasswd * get_pw_nam(char * name, struct hashtable* ht)
 296 {
 297         int h;
 298         struct mypasswd * hashentry;
 299
 300         if (!ht || !name || *name == '\0') return NULL;
 301         ht->last_found = NULL;
 302         if (ht->tablesize > 0) {
 303                 h = hash (name, ht->tablesize);
 304                 for (hashentry = ht->table[h]; hashentry; hashentry = hashentry->next)
 305                         if (!strcmp(hashentry->field[ht->keyfield], name)){
 306                                 /* save address of next item to check into buffer */
 307                                 ht->last_found=hashentry->next;
 308                                 return hashentry;
 309                         }
 310                 return NULL;
 311         }
 312         if (ht->fp) fclose(ht->fp);
 313         if (!(ht->fp=fopen(ht->filename, "r"))) return NULL;
 314         return get_next(name, ht);
 315 }
 316
 317 #ifdef TEST
 318
 319 #define MALLOC_CHECK_ 1
 320
 321 int main(void){
 322  struct hashtable *ht;
 323  char *buffer;
 324  struct mypasswd* pw;
 325  int i;
 326
 327  ht = build_hash_table("/etc/group", 4, 3, 1, 100, 0, ":");
 328  if(!ht) {
 329         printf("Hash table not built\n");
 330         return -1;
 331  }
 332  for (i=0; i<ht->tablesize; i++) if (ht->table[i]) {
 333   printf("%d:\n", i);
 334   for(pw=ht->table[i]; pw; pw=pw->next) printpw(pw, 4);
 335  }
 336
 337  while(fgets(buffer, 1024, stdin)){
 338   buffer[strlen(buffer)-1] = 0;
 339   pw = get_pw_nam(buffer, ht);
 340   printpw(pw,4);
 341   while (pw = get_next(buffer, ht)) printpw(pw,4);
 342  }
 343  release_ht(ht);
 344 }
 345
 346 #else  /* TEST */
 347 struct passwd_instance {
 348         struct hashtable *ht;
 349         struct mypasswd *pwdfmt;
 350         char *filename;
 351         char *format;
 352         char * delimiter;
 353         int allowmultiple;
 354         int ignorenislike;
 355         int hashsize;
 356         int nfields;
 357         int keyfield;
 358         int listable;
 359         int keyattr;
 360         int keyattrtype;
 361         int ignoreempty;
 362 };
 363
 364 static const CONF_PARSER module_config[] = {
 365         { "filename",   PW_TYPE_FILENAME,
 366            offsetof(struct passwd_instance, filename), NULL,  NULL },
 367         { "format",   PW_TYPE_STRING_PTR,
 368            offsetof(struct passwd_instance, format), NULL,  NULL },
 369         { "delimiter",   PW_TYPE_STRING_PTR,
 370            offsetof(struct passwd_instance, delimiter), NULL,  ":" },
 371         { "ignorenislike",   PW_TYPE_BOOLEAN,
 372            offsetof(struct passwd_instance, ignorenislike), NULL,  "yes" },
 373         { "ignoreempty",   PW_TYPE_BOOLEAN,
 374            offsetof(struct passwd_instance, ignoreempty), NULL,  "yes" },
 375         { "allowmultiplekeys",   PW_TYPE_BOOLEAN,
 376            offsetof(struct passwd_instance, allowmultiple), NULL,  "no" },
 377         { "hashsize",   PW_TYPE_INTEGER,
 378            offsetof(struct passwd_instance, hashsize), NULL,  "100" },
 379         { NULL, -1, 0, NULL, NULL }
 380 };
 381
 382 static int passwd_instantiate(CONF_SECTION *conf, void **instance)
 383 {
 384 #define inst ((struct passwd_instance *)*instance)
 385         int nfields=0, keyfield=-1, listable=0;
 386         char *s;
 387         char *lf=NULL; /* destination list flags temporary */
 388         int len;
 389         int i;
 390         DICT_ATTR * da;
 391
 392         *instance = rad_malloc(sizeof(struct passwd_instance));
 393         if ( !*instance) {
 394                 radlog(L_ERR, "rlm_passwd: cann't alloc instance");
 395                 return -1;
 396         }
 397         memset(*instance, 0, sizeof(struct passwd_instance));
 398         if (cf_section_parse(conf, inst, module_config) < 0) {
 399                 free(inst);
 400                 radlog(L_ERR, "rlm_passwd: cann't parse configuration");
 401                 return -1;
 402         }
 403         if(!inst->filename || *inst->filename == '\0' || !inst->format || *inst->format == '\0') {
 404                 radlog(L_ERR, "rlm_passwd: cann't find passwd file and/or format in configuration");
 405                 return -1;
 406         }
 407         lf=strdup(inst->format);
 408         if ( lf == NULL) {
 409                 radlog(L_ERR, "rlm_passwd: memory allocation failed for lf");
 410                 return -1;
 411         }
 412         memset(lf, 0, strlen(inst->format));
 413         s = inst->format - 1;
 414         do {
 415                 if(s == inst->format - 1 || *s == ':'){
 416                         if(*(s+1) == '*'){
 417                                 keyfield = nfields;
 418                                 s++;
 419                         }
 420                         if(*(s+1) == ','){
 421                                 listable = 1;
 422                                 s++;
 423                         }
 424                         if(*(s+1) == '='){
 425                                 lf[nfields]=1;
 426                                 s++;
 427                         }
 428                         if(*(s+1) == '~'){
 429                                 lf[nfields]=2;
 430                                 s++;
 431                         }
 432                         nfields++;
 433                 }
 434                 s++;
 435         }while(*s);
 436         if(keyfield < 0) {
 437                 radlog(L_ERR, "rlm_passwd: no field market as key in format: %s", inst->format);
 438                 return -1;
 439         }
 440         if (! (inst->ht = build_hash_table (inst->filename, nfields, keyfield, listable, inst->hashsize, inst->ignorenislike, *inst->delimiter)) ){
 441                 radlog(L_ERR, "rlm_passwd: can't build hashtable from passwd file");
 442                 return -1;
 443         }
 444         if (! (inst->pwdfmt = mypasswd_malloc(inst->format, nfields, &len)) ){
 445                 radlog(L_ERR, "rlm_passwd: memory allocation failed");
 446                 release_ht(inst->ht);
 447                 return -1;
 448         }
 449         if (!string_to_entry(inst->format, nfields, ':', inst->pwdfmt , len)) {
 450                 radlog(L_ERR, "rlm_passwd: unable to convert format entry");
 451                 release_ht(inst->ht);
 452                 return -1;
 453         }
 454
 455         memcpy(inst->pwdfmt->listflag, lf, nfields);
 456
 457         free(lf);
 458         for (i=0; i<nfields; i++) {
 459                 if (*inst->pwdfmt->field[i] == '*') inst->pwdfmt->field[i]++;
 460                 if (*inst->pwdfmt->field[i] == ',') inst->pwdfmt->field[i]++;
 461                 if (*inst->pwdfmt->field[i] == '=') inst->pwdfmt->field[i]++;
 462                 if (*inst->pwdfmt->field[i] == '~') inst->pwdfmt->field[i]++;
 463         }
 464         if (!*inst->pwdfmt->field[keyfield]) {
 465                 radlog(L_ERR, "rlm_passwd: key field is empty");
 466                 release_ht(inst->ht);
 467                 return -1;
 468         }
 469         if (! (da = dict_attrbyname (inst->pwdfmt->field[keyfield])) ) {
 470                 radlog(L_ERR, "rlm_passwd: unable to resolve attribute: %s", inst->pwdfmt->field[keyfield]);
 471                 release_ht(inst->ht);
 472                 return -1;
 473         }
 474         inst->keyattr = da->attr;
 475         inst->keyattrtype = da->type;
 476         inst->nfields = nfields;
 477         inst->keyfield = keyfield;
 478         inst->listable = listable;
 479         DEBUG("rlm_passwd: nfields: %d keyfield %d(%s) listable: %s", nfields, keyfield, inst->pwdfmt->field[keyfield], listable?"yes":"no");
 480         return 0;
 481
 482 #undef inst
 483 }
 484
 485 static int passwd_detach (void *instance) {
 486 #define inst ((struct passwd_instance *)instance)
 487         if(inst->ht) release_ht(inst->ht);
 488         free(instance);
 489         return 0;
 490 #undef inst
 491 }
 492
 493 static void addresult (struct passwd_instance * inst, VALUE_PAIR ** vp, struct mypasswd * pw, char when, const char *listname)
 494 {
 495         int i;
 496         VALUE_PAIR *newpair;
 497
 498         for (i=0; i<inst->nfields; i++) {
 499                 if (inst->pwdfmt->field[i] && *inst->pwdfmt->field[i] && pw->field[i] && i != inst->keyfield  && inst->pwdfmt->listflag[i] == when) {
 500                         if ( !inst->ignoreempty || pw->field[i][0] != 0 ) { /* if value in key/value pair is not empty */
 501                                 if (! (newpair = pairmake (inst->pwdfmt->field[i], pw->field[i], T_OP_EQ))) {
 502                                         radlog(L_AUTH, "rlm_passwd: Unable to create %s: %s", inst->pwdfmt->field[i], pw->field[i]);
 503                                         return;
 504                                 }
 505                                 radlog(L_DBG, "rlm_passwd: Added %s: '%s' to %s ", inst->pwdfmt->field[i], pw->field[i], listname);
 506                                 pairadd (vp, newpair);
 507                         } else
 508                                 radlog(L_DBG, "rlm_passwd: NOOP %s: '%s' to %s ", inst->pwdfmt->field[i], pw->field[i], listname);
 509                 }
 510         }
 511 }
 512
 513 static int passwd_authorize(void *instance, REQUEST *request)
 514 {
 515 #define inst ((struct passwd_instance *)instance)
 516         char * name;
 517         char buffer[1024];
 518         VALUE_PAIR * key;
 519         struct mypasswd * pw;
 520         int found = 0;
 521
 522         if(!request || !request->packet ||!request->packet->vps)
 523          return RLM_MODULE_INVALID;
 524         for (key = request->packet->vps;
 525          key && (key = pairfind (key, inst->keyattr));
 526           key = key->next ){
 527                 switch (inst->keyattrtype) {
 528                         case PW_TYPE_INTEGER:
 529                                 snprintf(buffer, 1024, "%u", key->lvalue);
 530                                 name = buffer;
 531                                 break;
 532                         default:
 533                                 name = key->vp_strvalue;
 534                 }
 535                 if (! (pw = get_pw_nam(name, inst->ht)) ) {
 536                         continue;
 537                 }
 538                 do {
 539                         addresult(inst, &request->config_items, pw, 0, "config_items");
 540                         addresult(inst, &request->reply->vps, pw, 1, "reply_items");
 541                         addresult(inst, &request->packet->vps,  pw, 2, "request_items");
 542                 } while ( (pw = get_next(name, inst->ht)) );
 543                 found++;
 544                 if (!inst->allowmultiple) break;
 545         }
 546         if(!found) {
 547                 return RLM_MODULE_NOTFOUND;
 548         }
 549         return RLM_MODULE_OK;
 550
 551 #undef inst
 552 }
 553
 554 module_t rlm_passwd = {
 555         RLM_MODULE_INIT,
 556         "passwd",
 557         RLM_TYPE_THREAD_SAFE,           /* type */
 558         passwd_instantiate,             /* instantiation */
 559         passwd_detach,                  /* detach */
 560         {
 561                 NULL,                   /* authentication */
 562                 passwd_authorize,       /* authorization */
 563                 NULL,                   /* pre-accounting */
 564                 NULL,                   /* accounting */
 565                 NULL,                   /* checksimul */
 566                 NULL,                   /* pre-proxy */
 567                 NULL,                   /* post-proxy */
 568                 NULL                    /* post-auth */
 569         },
 570 };
 571 #endif /* TEST */