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