src/server/security-server-main.c

   1 /*
   2  * security-server
   3  *
   4  *  Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd All Rights Reserved
   5  *
   6  *  Contact: Bumjin Im <bj.im@samsung.com>
   7  *
   8  *  Licensed under the Apache License, Version 2.0 (the "License");
   9  *  you may not use this file except in compliance with the License.
  10  *  You may obtain a copy of the License at
  11  *
  12  *      http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  *  Unless required by applicable law or agreed to in writing, software
  15  *  distributed under the License is distributed on an "AS IS" BASIS,
  16  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  *  See the License for the specific language governing permissions and
  18  *  limitations under the License
  19  *
  20  */
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <sys/types.h>
  28 #include <sys/smack.h>
  29 #include <errno.h>
  30 #include <signal.h>
  31 #include <pthread.h>
  32 #include <limits.h>
  33 #include <fcntl.h>
  34 #include <sys/smack.h>
  35 #include <sys/types.h>
  36 #include <sys/socket.h>
  37 #include <sys/wait.h>
  38 #include <poll.h>
  39
  40 #include <privilege-control.h>
  41 #include <security-server-system-observer.h>
  42 #include <security-server-rules-revoker.h>
  43
  44 #include "security-server-cookie.h"
  45 #include "security-server-common.h"
  46 #include "security-server-password.h"
  47 #include "security-server-comm.h"
  48 #include "smack-check.h"
  49
  50 const char * const LABEL_SECURITY_SERVER_API_DATA_SHARE = "security-server::api-data-share";
  51
  52 /* Set cookie as a global variable */
  53 cookie_list *c_list;
  54 pthread_mutex_t cookie_mutex;
  55 int thread_status[SECURITY_SERVER_NUM_THREADS];
  56 struct security_server_thread_param {
  57         int client_sockfd;
  58         int server_sockfd;
  59         int thread_status;
  60 };
  61
  62 int process_app_get_access_request(int sockfd, size_t msg_len);
  63 static int netlink_enabled = 1; /* prevent memory leaks when netlink is disabled */
  64
  65
  66 /************************************************************************************************/
  67 /* Just for test. This code must be removed on release */
  68 #include "security-server-util.h"
  69 /************************************************************************************************/
  70
  71 #if 0
  72 void printhex(unsigned char *data, int size)
  73 {
  74         int i;
  75         for(i=0;i<size;i++)
  76         {
  77                 if(data[i] < 0xF)
  78                         printf("0");
  79
  80                 printf("%X ", data[i]);
  81                 if(((i+1) % 16) == 0 && i != 0)
  82                         printf("\n");
  83         }
  84         printf("\n");
  85 }
  86
  87 void print_cookie(cookie_list *list)
  88 {
  89         int i;
  90         printf("%s", "cookie:\n");
  91         printhex(list->cookie, SECURITY_SERVER_COOKIE_LEN);
  92         printf("path_len: %d\n", list->path_len);
  93         printf("permission_len: %d\n", list->permission_len);
  94         printf("PID: %d\n", list->pid);
  95         printf("path: %s\n", list->path);
  96         printf("%s", "permissions: ");
  97         for(i=0;i<list->permission_len;i++)
  98         {
  99                 printf("%d ", list->permissions[i]);
 100         }
 101         printf("%s", "\n");
 102         printf("prev: %p\n", list->prev);
 103         printf("next: %p\n", list->next);
 104 }
 105 #endif
 106
 107 /* Object name is actually name of a Group ID *
 108  * This function opens /etc/group file and search group ID and
 109  * returns the string */
 110 int search_object_name(int gid, char *obj, int obj_size)
 111 {
 112         FILE *fp = NULL;
 113         char *linebuf = NULL, *token = NULL, *token2, *tempstr = NULL;
 114         int ret = 0, tmp_gid, bufsize;
 115         fp = fopen("/etc/group", "r");
 116         if(fp == NULL)
 117         {
 118                 /* cannot open /etc/group */
 119                 SEC_SVR_DBG("%s", "Cannot open /etc/group");
 120                 return SECURITY_SERVER_ERROR_FILE_OPERATION;
 121         }
 122
 123         linebuf = malloc(128);
 124         bufsize = 128;
 125         if(linebuf == NULL)
 126         {
 127                 ret = SECURITY_SERVER_ERROR_OUT_OF_MEMORY;
 128                 SEC_SVR_DBG("%s", "cannot malloc()");
 129                 goto error;
 130         }
 131
 132         bzero(linebuf, bufsize);
 133         ret = SECURITY_SERVER_ERROR_NO_SUCH_OBJECT;
 134         while(fgets(linebuf, bufsize, fp) != NULL)
 135         {
 136                 while(linebuf[bufsize -2] != 0)
 137                 {
 138                         linebuf[bufsize -1] = (char) fgetc(fp);
 139                         tempstr = realloc(linebuf, bufsize + 128);
 140                         if(tempstr == NULL)
 141                         {
 142                                 ret = SECURITY_SERVER_ERROR_OUT_OF_MEMORY;
 143                                 goto error;
 144                         }
 145                         linebuf = tempstr;
 146                         bzero(linebuf + bufsize, 128);
 147                         fgets(linebuf + bufsize, 128, fp);
 148                         bufsize += 128;
 149                 }
 150
 151                 token = strtok(linebuf, ":");   /* group name */
 152                 if(token == NULL)
 153                 {
 154                         SEC_SVR_DBG("/etc/group is not valid. cannot find gid: [%s]", linebuf);
 155                         ret = SECURITY_SERVER_ERROR_SERVER_ERROR;
 156                         goto error;
 157                 }
 158                 token2 = strtok(NULL, ":");     /* group password */
 159                 if(token2== NULL)
 160                 {
 161                         SEC_SVR_DBG("/etc/group is not valid. cannot find gid: [%s]", linebuf);
 162                         ret = SECURITY_SERVER_ERROR_SERVER_ERROR;
 163                         goto error;
 164                 }
 165                 token2 = strtok(NULL, ":");     /* gid */
 166                 if(token2 == NULL)
 167                 {
 168                         SEC_SVR_DBG("/etc/group is not valid. cannot find gid: [%s]", linebuf);
 169                         ret = SECURITY_SERVER_ERROR_SERVER_ERROR;
 170                         goto error;
 171                 }
 172
 173                 errno = 0;
 174                 tmp_gid = strtoul(token2, 0, 10);
 175                 if (errno != 0)
 176                 {
 177                         SEC_SVR_DBG("cannot change string to integer [%s]", token2);
 178                         ret = SECURITY_SERVER_ERROR_SERVER_ERROR;
 179                         goto error;
 180                 }
 181
 182                 if(tmp_gid == gid)
 183                 {
 184                         /* We found it */
 185                         if((int)strlen(token) > obj_size)
 186                         {
 187                                 ret = SECURITY_SERVER_ERROR_BUFFER_TOO_SMALL;
 188                                 SEC_SVR_DBG("buffer is too small. %d --> %d", obj_size, strlen(token));
 189                                 goto error;
 190                         }
 191                         strncpy(obj, token, strlen(token));
 192                         obj[strlen(token)] = 0;
 193                         ret = SECURITY_SERVER_SUCCESS;
 194                         break;
 195                 }
 196                 bzero(linebuf, bufsize);
 197         }
 198
 199 error:
 200         if(linebuf != NULL)
 201                 free(linebuf);
 202         if(fp != NULL)
 203                 fclose(fp);
 204         return ret;
 205 }
 206
 207 /* Search GID from group name *
 208  * This function opens /etc/group and search group name by given gid */
 209 int search_gid(const char *obj)
 210 {
 211         FILE *fp = NULL;
 212         char *linebuf = NULL, *token = NULL, *token2, *tempstr = NULL;
 213         int ret = SECURITY_SERVER_ERROR_NO_SUCH_OBJECT, tmp_gid, bufsize;
 214
 215         SEC_SVR_DBG("Searching for object %s", obj);
 216
 217         fp = fopen("/etc/group", "r");
 218         if(fp == NULL)
 219         {
 220                 /* cannot open /etc/group */
 221                 SEC_SVR_DBG("%s", "cannot open /etc/group");
 222                 return SECURITY_SERVER_ERROR_FILE_OPERATION;
 223         }
 224
 225         linebuf = malloc(128);
 226         bufsize = 128;
 227         if(linebuf == NULL)
 228         {
 229                 ret = SECURITY_SERVER_ERROR_OUT_OF_MEMORY;
 230                 SEC_SVR_DBG("%s", "Out Of Memory");
 231                 goto error;
 232         }
 233
 234         bzero(linebuf, bufsize);
 235         while(fgets(linebuf, bufsize, fp) != NULL)
 236         {
 237                 while(linebuf[bufsize -2] != 0 )
 238                 {
 239                         linebuf[bufsize -1] = (char) fgetc(fp);
 240                         tempstr = realloc(linebuf, bufsize + 128);
 241                         if(tempstr == NULL)
 242                         {
 243                                 ret = SECURITY_SERVER_ERROR_OUT_OF_MEMORY;
 244                                 goto error;
 245                         }
 246                         linebuf = tempstr;
 247                         bzero(linebuf + bufsize, 128);
 248                         fgets(linebuf + bufsize, 128, fp);
 249                         bufsize += 128;
 250                 }
 251
 252                 token = strtok(linebuf, ":");   /* group name */
 253                 token2 = strtok(NULL, ":");     /* group password */
 254                 token2 = strtok(NULL, ":");     /* gid */
 255                 if(token2 == NULL)
 256                 {
 257                         SEC_SVR_DBG("/etc/group is not valid. cannot find gid: [%s]", linebuf);
 258                         ret = SECURITY_SERVER_ERROR_SERVER_ERROR;
 259                         goto error;
 260                 }
 261                 errno = 0;
 262                 tmp_gid = strtoul(token2, 0, 10);
 263                 if ( errno != 0 )
 264                 {
 265                         SEC_SVR_DBG("cannot change string to integer [%s]", token2);
 266                         ret = SECURITY_SERVER_ERROR_SERVER_ERROR;
 267                         goto error;
 268                 }
 269
 270                 if(strcmp(obj, token) == 0)
 271                 {
 272                         /* We found it */
 273                         ret = tmp_gid;
 274                         SEC_SVR_DBG("GID of %s is found: %d", obj, ret);
 275                         break;
 276                 }
 277                 bzero(linebuf, bufsize);
 278         }
 279
 280 error:
 281         if(linebuf != NULL)
 282                 free(linebuf);
 283         if(fp != NULL)
 284                 fclose(fp);
 285         return ret;
 286 }
 287
 288 /* Signal handler for processes */
 289 static void security_server_sig_child(int signo, siginfo_t *info, void *data)
 290 {
 291     int status;
 292     pid_t child_pid;
 293     pid_t child_pgid;
 294
 295     (void)signo;
 296     (void)data;
 297
 298     child_pgid = getpgid(info->si_pid);
 299     SEC_SVR_DBG("Signal handler: dead_pid=%d, pgid=%d",info->si_pid,child_pgid);
 300
 301     while ((child_pid = waitpid(-1, &status, WNOHANG)) > 0) {
 302         if(child_pid == child_pgid)
 303             killpg(child_pgid,SIGKILL);
 304     }
 305
 306     return;
 307 }
 308
 309 /* Execute a debugging tool by fork() and execve() */
 310 int execute_debug_tool(int argc, char *const *argv, int server_sockfd, int client_sockfd)
 311 {
 312     int ret, i;
 313     SEC_SVR_DBG("%s", "Executing tool");
 314
 315     (void)argc;
 316
 317     ret = fork();
 318     if(ret == 0)
 319     {
 320         close(client_sockfd);
 321         close(server_sockfd);
 322         setsid();
 323
 324         for(i=0;i<_NSIG;i++)
 325             signal(i, SIG_DFL);
 326
 327         ret = execv(argv[0], argv);
 328         if(ret == -1)
 329         {
 330             SEC_SVR_DBG("Error:Failed to execute [%d]", errno);
 331             exit(-1);
 332         }
 333     }
 334     if(ret < 0)
 335     {
 336         SEC_SVR_DBG("Error: Failed to fork [%d]", errno);
 337         return SECURITY_SERVER_ERROR_SERVER_ERROR;
 338     }
 339     return SECURITY_SERVER_SUCCESS;
 340 }
 341
 342 int process_cookie_request(int sockfd)
 343 {
 344         int retval, client_pid, client_uid;
 345         cookie_list *created_cookie = NULL;
 346
 347         /* Authenticate client */
 348         retval = authenticate_client_application(sockfd, &client_pid, &client_uid);
 349         if(retval != SECURITY_SERVER_SUCCESS)
 350         {
 351                 SEC_SVR_DBG("%s", "Client Authentication Failed");
 352                 retval = send_generic_response(sockfd,
 353                                 SECURITY_SERVER_MSG_TYPE_GENERIC_RESPONSE,
 354                                 SECURITY_SERVER_RETURN_CODE_AUTHENTICATION_FAILED);
 355                 if(retval != SECURITY_SERVER_SUCCESS)
 356                 {
 357                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 358                 }
 359                 goto error;
 360         }
 361         /* If client application is root process, just respond default cookie */
 362     /*
 363         if( client_uid == 0)
 364         {
 365                 SEC_SVR_DBG("%s", "Requested application is a root process");
 366                 created_cookie = c_list;
 367                 if(c_list == NULL)
 368                 {
 369                         SEC_SVR_DBG("%s", "Cannot read default cookie");
 370                         goto error;
 371                 }
 372         }
 373         else
 374         {
 375     */
 376         //TODO: Remove above code if there will be no crashes without it
 377         //All process should be treaded the same
 378                 /* Create a new cookie. or find existing one */
 379                 pthread_mutex_lock(&cookie_mutex);
 380                 created_cookie = create_cookie_item(client_pid, sockfd, c_list);
 381                 pthread_mutex_unlock(&cookie_mutex);
 382                 if(created_cookie == NULL)
 383                 {
 384                         SEC_SVR_DBG("%s","Cannot create a cookie");
 385                         goto error;
 386                 }
 387
 388     //let others know if this cookie belongs to root process
 389     if(client_uid == 0)
 390         created_cookie->is_roots_process = 1;
 391     else
 392         created_cookie->is_roots_process = 0;
 393
 394         //}
 395         /* send cookie as response */
 396         retval = send_cookie(sockfd, created_cookie->cookie);
 397         if(retval != SECURITY_SERVER_SUCCESS)
 398         {
 399                 SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 400         }
 401         SEC_SVR_DBG("Server: Cookie created for client PID %d LABEL >%s<",
 402                     created_cookie->pid,
 403                     (created_cookie->smack_label)?(created_cookie->smack_label):"NULL");
 404
 405         SEC_SVR_DBG("%s", "Server: Cookie has been sent to client");
 406
 407 error:
 408         return retval;
 409 }
 410
 411 int process_check_privilege_request(int sockfd)
 412 {
 413         /* Authenticate client */
 414         int retval, client_pid, requested_privilege;
 415     int privileges[1];
 416         unsigned char requested_cookie[SECURITY_SERVER_COOKIE_LEN];
 417         cookie_list *search_result = NULL;
 418
 419         retval = authenticate_client_middleware(sockfd, &client_pid);
 420         if(retval != SECURITY_SERVER_SUCCESS)
 421         {
 422                 SEC_SVR_DBG("%s", "Client Authentication Failed");
 423                 retval = send_generic_response(sockfd,
 424                                 SECURITY_SERVER_MSG_TYPE_CHECK_PRIVILEGE_RESPONSE,
 425                                 SECURITY_SERVER_RETURN_CODE_AUTHENTICATION_FAILED);
 426                 if(retval != SECURITY_SERVER_SUCCESS)
 427                 {
 428                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 429                 }
 430                 goto error;;
 431         }
 432
 433         retval = recv_check_privilege_request(sockfd,
 434                                 requested_cookie, &requested_privilege);
 435         if(retval == SECURITY_SERVER_ERROR_RECV_FAILED)
 436         {
 437                 SEC_SVR_DBG("%s", "Receiving request failed");
 438                 retval = send_generic_response(sockfd,
 439                                 SECURITY_SERVER_MSG_TYPE_CHECK_PRIVILEGE_RESPONSE,
 440                                 SECURITY_SERVER_RETURN_CODE_BAD_REQUEST);
 441                 if(retval != SECURITY_SERVER_SUCCESS)
 442                 {
 443                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 444                 }
 445                 goto error;;
 446         }
 447
 448         if(requested_privilege < 1)
 449         {
 450                 SEC_SVR_DBG("Requiring bad privilege [%d]", requested_privilege);
 451                 retval = send_generic_response(sockfd,
 452                                 SECURITY_SERVER_MSG_TYPE_CHECK_PRIVILEGE_RESPONSE,
 453                                 SECURITY_SERVER_RETURN_CODE_BAD_REQUEST);
 454                 if(retval != SECURITY_SERVER_SUCCESS)
 455                 {
 456                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 457                 }
 458                 goto error;
 459         }
 460
 461         /* Search cookie list */
 462         pthread_mutex_lock(&cookie_mutex);
 463     privileges[0] = requested_privilege;
 464         search_result = search_cookie(c_list, requested_cookie, privileges, 1);
 465         pthread_mutex_unlock(&cookie_mutex);
 466         if(search_result != NULL)
 467         {
 468                 /* We found */
 469                 SEC_SVR_DBG("We found the cookie with %d privilege and pid:%d", requested_privilege, client_pid);
 470                 SEC_SVR_DBG("%s", "Cookie comparison succeeded. Access granted.");
 471                 retval = send_generic_response(sockfd,
 472                                 SECURITY_SERVER_MSG_TYPE_CHECK_PRIVILEGE_RESPONSE,
 473                                 SECURITY_SERVER_RETURN_CODE_ACCESS_GRANTED);
 474                 if(retval != SECURITY_SERVER_SUCCESS)
 475                 {
 476                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 477                 }
 478         }
 479         else
 480         {
 481                 /* It's not exist */
 482                 SEC_SVR_DBG("Could not find the cookie with %d privilege", requested_privilege);
 483                 retval = send_generic_response(sockfd,
 484                                 SECURITY_SERVER_MSG_TYPE_CHECK_PRIVILEGE_RESPONSE,
 485                                 SECURITY_SERVER_RETURN_CODE_ACCESS_DENIED);
 486                 if(retval != SECURITY_SERVER_SUCCESS)
 487                 {
 488                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 489                 }
 490         }
 491 error:
 492         return retval;
 493 }
 494
 495 int process_check_privilege_new_request(int sockfd)
 496 {
 497         /* Authenticate client */
 498         int retval, client_pid;
 499         unsigned char requested_cookie[SECURITY_SERVER_COOKIE_LEN];
 500         cookie_list *search_result = NULL;
 501         char object_label[MAX_OBJECT_LABEL_LEN+1];
 502         char access_rights[MAX_MODE_STR_LEN+1];
 503
 504         retval = authenticate_client_middleware(sockfd, &client_pid);
 505         if(retval != SECURITY_SERVER_SUCCESS)
 506         {
 507                 SEC_SVR_DBG("%s", "Client Authentication Failed");
 508                 retval = send_generic_response(sockfd,
 509                                 SECURITY_SERVER_MSG_TYPE_CHECK_PRIVILEGE_NEW_RESPONSE,
 510                                 SECURITY_SERVER_RETURN_CODE_AUTHENTICATION_FAILED);
 511                 if(retval != SECURITY_SERVER_SUCCESS)
 512                 {
 513                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 514                 }
 515                 goto error;;
 516         }
 517
 518         retval = recv_check_privilege_new_request(
 519                      sockfd, requested_cookie, object_label, access_rights);
 520         if(retval == SECURITY_SERVER_ERROR_RECV_FAILED)
 521         {
 522                 SEC_SVR_DBG("%s", "Receiving request failed");
 523                 retval = send_generic_response(sockfd,
 524                                 SECURITY_SERVER_MSG_TYPE_CHECK_PRIVILEGE_NEW_RESPONSE,
 525                                 SECURITY_SERVER_RETURN_CODE_BAD_REQUEST);
 526                 if(retval != SECURITY_SERVER_SUCCESS)
 527                 {
 528                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 529                 }
 530                 goto error;;
 531         }
 532
 533         /* Search cookie list */
 534         pthread_mutex_lock(&cookie_mutex);
 535         search_result = search_cookie_new(c_list, requested_cookie, object_label, access_rights);
 536         pthread_mutex_unlock(&cookie_mutex);
 537
 538         if(search_result != NULL)
 539     {
 540                 /* We found */
 541                 SEC_SVR_DBG("We found the cookie with %s rights and pid:%d", access_rights, client_pid);
 542                 SEC_SVR_DBG("%s", "Cookie comparison succeeded. Access granted.");
 543                 retval = send_generic_response(sockfd,
 544                                 SECURITY_SERVER_MSG_TYPE_CHECK_PRIVILEGE_NEW_RESPONSE,
 545                                 SECURITY_SERVER_RETURN_CODE_ACCESS_GRANTED);
 546                 if(retval != SECURITY_SERVER_SUCCESS)
 547                 {
 548                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 549                 }
 550         }
 551         else
 552         {
 553                 /* It's not exist */
 554                 SEC_SVR_DBG("Could not find the cookie with %s rights", access_rights);
 555                 retval = send_generic_response(sockfd,
 556                                 SECURITY_SERVER_MSG_TYPE_CHECK_PRIVILEGE_NEW_RESPONSE,
 557                                 SECURITY_SERVER_RETURN_CODE_ACCESS_DENIED);
 558                 if(retval != SECURITY_SERVER_SUCCESS)
 559                 {
 560                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 561                 }
 562         }
 563 error:
 564         return retval;
 565
 566
 567 }
 568
 569 int process_object_name_request(int sockfd)
 570 {
 571         int retval, client_pid, requested_privilege;
 572         char object_name[SECURITY_SERVER_MAX_OBJ_NAME];
 573
 574         /* Authenticate client */
 575         retval = authenticate_client_middleware(sockfd, &client_pid);
 576         if(retval != SECURITY_SERVER_SUCCESS)
 577         {
 578                 SEC_SVR_DBG("%s", "Client Authentication Failed");
 579                 retval = send_generic_response(sockfd,
 580                                 SECURITY_SERVER_MSG_TYPE_OBJECT_NAME_RESPONSE,
 581                                 SECURITY_SERVER_RETURN_CODE_AUTHENTICATION_FAILED);
 582                 if(retval != SECURITY_SERVER_SUCCESS)
 583                 {
 584                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 585                 }
 586                 goto error;
 587         }
 588
 589         /* Receive GID */
 590         retval = TEMP_FAILURE_RETRY(read(sockfd, &requested_privilege, sizeof(requested_privilege)));
 591         if (retval < (int)sizeof(requested_privilege))
 592         {
 593                 SEC_SVR_DBG("%s", "Receiving request failed");
 594                 retval = send_generic_response(sockfd,
 595                                 SECURITY_SERVER_MSG_TYPE_OBJECT_NAME_RESPONSE,
 596                                 SECURITY_SERVER_RETURN_CODE_BAD_REQUEST);
 597                 if(retval != SECURITY_SERVER_SUCCESS)
 598                 {
 599                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 600                 }
 601                 goto error;
 602         }
 603
 604         /* Search from /etc/group */
 605         retval = search_object_name(requested_privilege,
 606                         object_name,
 607                         SECURITY_SERVER_MAX_OBJ_NAME);
 608         if (retval == SECURITY_SERVER_ERROR_NO_SUCH_OBJECT)
 609         {
 610                 /* It's not exist */
 611                 SEC_SVR_DBG("There is no such object for gid [%d]", requested_privilege);
 612                 retval = send_generic_response(sockfd,
 613                                 SECURITY_SERVER_MSG_TYPE_OBJECT_NAME_RESPONSE,
 614                                 SECURITY_SERVER_RETURN_CODE_NO_SUCH_OBJECT);
 615                 if(retval != SECURITY_SERVER_SUCCESS)
 616                 {
 617                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 618                 }
 619                 goto error;
 620         }
 621         if(retval != SECURITY_SERVER_SUCCESS)
 622         {
 623                 /* Error occurred */
 624                 SEC_SVR_DBG("Error on searching object name [%d]", retval);
 625                 retval = send_generic_response(sockfd,
 626                                 SECURITY_SERVER_MSG_TYPE_OBJECT_NAME_RESPONSE,
 627                                 SECURITY_SERVER_RETURN_CODE_SERVER_ERROR);
 628                 if(retval != SECURITY_SERVER_SUCCESS)
 629                 {
 630                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 631                 }
 632                 goto error;
 633         }
 634
 635         /* We found */
 636         SEC_SVR_DBG("We found object: %s", object_name);
 637         retval = send_object_name(sockfd, object_name);
 638         if(retval != SECURITY_SERVER_SUCCESS)
 639         {
 640                 SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 641         }
 642
 643 error:
 644         return retval;
 645 }
 646
 647 int process_gid_request(int sockfd, int msg_len)
 648 {
 649         int retval, client_pid;
 650         char object_name[SECURITY_SERVER_MAX_OBJ_NAME];
 651         /* Authenticate client as middleware daemon */
 652         retval = authenticate_client_middleware(sockfd, &client_pid);
 653         if(retval != SECURITY_SERVER_SUCCESS)
 654         {
 655                 SEC_SVR_DBG("%s", "Client authentication failed");
 656                 retval = send_generic_response(sockfd,
 657                                 SECURITY_SERVER_MSG_TYPE_GID_RESPONSE,
 658                                 SECURITY_SERVER_RETURN_CODE_AUTHENTICATION_FAILED);
 659                 if(retval != SECURITY_SERVER_SUCCESS)
 660                 {
 661                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 662                 }
 663                 goto error;
 664         }
 665
 666         if(msg_len >= SECURITY_SERVER_MAX_OBJ_NAME)
 667         {
 668                 /* Too big ojbect name */
 669                 SEC_SVR_DBG("%s", "Object name is too big");
 670                 retval = send_generic_response(sockfd,
 671                                 SECURITY_SERVER_MSG_TYPE_GID_RESPONSE,
 672                                 SECURITY_SERVER_RETURN_CODE_BAD_REQUEST);
 673                 if(retval != SECURITY_SERVER_SUCCESS)
 674                 {
 675                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 676                 }
 677                 goto error;
 678         }
 679
 680         /* Receive group name */
 681         retval = TEMP_FAILURE_RETRY(read(sockfd, object_name, msg_len));
 682         if (retval < msg_len )
 683         {
 684                 SEC_SVR_DBG("%s", "Failed to read object name");
 685                 retval = send_generic_response(sockfd,
 686                                 SECURITY_SERVER_MSG_TYPE_GID_RESPONSE,
 687                                 SECURITY_SERVER_RETURN_CODE_BAD_REQUEST);
 688                 if(retval != SECURITY_SERVER_SUCCESS)
 689                 {
 690                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 691                 }
 692                 goto error;
 693         }
 694         object_name[msg_len] = 0;
 695
 696         /* Search /etc/group for the given group name */
 697         retval = search_gid(object_name);
 698         if (retval == SECURITY_SERVER_ERROR_NO_SUCH_OBJECT)
 699         {
 700                 /* Not exist */
 701                 SEC_SVR_DBG("The object [%s] is not exist", object_name);
 702                 retval = send_generic_response(sockfd,
 703                                 SECURITY_SERVER_MSG_TYPE_GID_RESPONSE,
 704                                 SECURITY_SERVER_RETURN_CODE_NO_SUCH_OBJECT);
 705                 if(retval != SECURITY_SERVER_SUCCESS)
 706                 {
 707                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 708                 }
 709                 goto error;
 710         }
 711
 712         if(retval < 0)
 713         {
 714                 /* Error occurred */
 715                 SEC_SVR_DBG("Cannot send the response. %d", retval);
 716                 retval = send_generic_response(sockfd,
 717                                 SECURITY_SERVER_MSG_TYPE_GID_RESPONSE,
 718                                 SECURITY_SERVER_RETURN_CODE_SERVER_ERROR);
 719                 if(retval != SECURITY_SERVER_SUCCESS)
 720                 {
 721                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 722                 }
 723
 724                 goto error;
 725         }
 726         /* We found */
 727         retval = send_gid(sockfd, retval);
 728         if(retval != SECURITY_SERVER_SUCCESS)
 729         {
 730                 SEC_SVR_DBG("ERROR: Cannot gid response: %d", retval);
 731         }
 732 error:
 733         return retval;
 734 }
 735
 736 int process_pid_request(int sockfd)
 737 {
 738         int retval, client_pid;
 739         unsigned char requested_cookie[SECURITY_SERVER_COOKIE_LEN];
 740     int * privileges = NULL;
 741         cookie_list *search_result = NULL;
 742
 743         /* Authenticate client */
 744         retval = authenticate_client_middleware(sockfd, &client_pid);
 745         if(retval != SECURITY_SERVER_SUCCESS)
 746         {
 747                 SEC_SVR_DBG("%s", "Client Authentication Failed");
 748                 retval = send_generic_response(sockfd,
 749                                 SECURITY_SERVER_MSG_TYPE_PID_RESPONSE,
 750                                 SECURITY_SERVER_RETURN_CODE_AUTHENTICATION_FAILED);
 751                 if(retval != SECURITY_SERVER_SUCCESS)
 752                 {
 753                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 754                 }
 755                 goto error;
 756         }
 757
 758         retval = recv_pid_request(sockfd, requested_cookie);
 759         if(retval == SECURITY_SERVER_ERROR_RECV_FAILED)
 760         {
 761                 SEC_SVR_DBG("%s", "Receiving request failed");
 762                 retval = send_generic_response(sockfd,
 763                                 SECURITY_SERVER_MSG_TYPE_PID_RESPONSE,
 764                                 SECURITY_SERVER_RETURN_CODE_BAD_REQUEST);
 765                 if(retval != SECURITY_SERVER_SUCCESS)
 766                 {
 767                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 768                 }
 769                 goto error;
 770         }
 771
 772     retval = get_client_gid_list(sockfd, &privileges);
 773     if(retval < 0)
 774     {
 775         SEC_SVR_DBG("ERROR: Cannot get GID list");
 776         goto error;
 777     }
 778
 779     /* Search cookie list */
 780     pthread_mutex_lock(&cookie_mutex);
 781     search_result = search_cookie(c_list, requested_cookie, privileges, retval);
 782     pthread_mutex_unlock(&cookie_mutex);
 783
 784     free(privileges);
 785
 786         if(search_result != NULL)
 787         {
 788                 /* We found */
 789                 SEC_SVR_DBG("We found the cookie and pid:%d", search_result->pid);
 790                 SEC_SVR_DBG("%s", "Cookie comparison succeeded. Access granted.");
 791                 retval = send_pid(sockfd, search_result->pid);
 792
 793                 if(retval != SECURITY_SERVER_SUCCESS)
 794                 {
 795                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 796                 }
 797         }
 798         else
 799         {
 800                 /* It's not exist */
 801                 SEC_SVR_DBG("%s", "Could not find the cookie");
 802                 retval = send_generic_response(sockfd,
 803                                 SECURITY_SERVER_MSG_TYPE_PID_RESPONSE,
 804                                 SECURITY_SERVER_RETURN_CODE_NO_SUCH_COOKIE);
 805                 if(retval != SECURITY_SERVER_SUCCESS)
 806                 {
 807                         SEC_SVR_DBG("ERROR: Cannot send pid response: %d", retval);
 808                 }
 809         }
 810 error:
 811         return retval;
 812 }
 813
 814 int process_smack_request(int sockfd)
 815 {
 816     int retval, client_pid;
 817     int * privileges = NULL;
 818     unsigned char requested_cookie[SECURITY_SERVER_COOKIE_LEN];
 819     cookie_list *search_result = NULL;
 820     //handler for SMACK label
 821     char * label = NULL;
 822
 823     /* Authenticate client */
 824     retval = authenticate_client_middleware(sockfd, &client_pid);
 825     if(retval != SECURITY_SERVER_SUCCESS)
 826     {
 827         SEC_SVR_DBG("%s", "Client Authentication Failed");
 828         retval = send_generic_response(sockfd,
 829           SECURITY_SERVER_MSG_TYPE_SMACK_RESPONSE,
 830           SECURITY_SERVER_RETURN_CODE_AUTHENTICATION_FAILED);
 831         if(retval != SECURITY_SERVER_SUCCESS)
 832         {
 833             SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 834         }
 835         goto error;
 836     }
 837
 838     retval = recv_smack_request(sockfd, requested_cookie);
 839     if(retval == SECURITY_SERVER_ERROR_RECV_FAILED)
 840     {
 841         SEC_SVR_DBG("%s", "Receiving request failed");
 842         retval = send_generic_response(sockfd,
 843           SECURITY_SERVER_MSG_TYPE_SMACK_RESPONSE,
 844           SECURITY_SERVER_RETURN_CODE_BAD_REQUEST);
 845         if(retval != SECURITY_SERVER_SUCCESS)
 846         {
 847             SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 848         }
 849         goto error;
 850     }
 851
 852     retval = get_client_gid_list(sockfd, &privileges);
 853     if(retval < 0)
 854     {
 855         SEC_SVR_DBG("ERROR: Cannot get GID list");
 856         goto error;
 857     }
 858
 859     /* Search cookie list */
 860     pthread_mutex_lock(&cookie_mutex);
 861     search_result = search_cookie(c_list, requested_cookie, privileges, retval);
 862     pthread_mutex_unlock(&cookie_mutex);
 863
 864     free(privileges);
 865
 866     if(search_result != NULL)
 867     {
 868         /* We found */
 869         SEC_SVR_DBG("We found the cookie and pid:%d", search_result->pid);
 870         SEC_SVR_DBG("%s", "Cookie comparison succeeded. Access granted.");
 871
 872         label = search_result->smack_label;
 873
 874         if (NULL == label)
 875         {
 876             SEC_SVR_DBG("%s", "No SMACK support on device - returning empty label");
 877             label = "";
 878         }
 879
 880         SEC_SVR_DBG("Read label is: %s\n", label);
 881
 882         retval = send_smack(sockfd, label);
 883
 884         if(retval != SECURITY_SERVER_SUCCESS)
 885         {
 886             SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 887         }
 888     }
 889     else
 890     {
 891         /* It's not exist */
 892         SEC_SVR_DBG("%s", "Could not find the cookie");
 893         retval = send_generic_response(sockfd,
 894           SECURITY_SERVER_MSG_TYPE_SMACK_RESPONSE,
 895           SECURITY_SERVER_RETURN_CODE_NO_SUCH_COOKIE);
 896         if(retval != SECURITY_SERVER_SUCCESS)
 897         {
 898             SEC_SVR_DBG("ERROR: Cannot send SMACK label response: %d", retval);
 899         }
 900     }
 901 error:
 902     return retval;
 903 }
 904
 905 int process_pid_privilege_check(int sockfd, int datasize)
 906 {
 907     //In this function we parsing received PID privilege check request
 908     int retval;
 909     int client_pid;
 910     int pid;
 911     char * object = NULL;
 912     char * access_rights = NULL;
 913     unsigned char return_code;
 914     //file descriptor
 915     int fd = -1;
 916     const int B_SIZE = 64;
 917     char buff[B_SIZE];
 918
 919     //authenticate client
 920     retval = authenticate_client_middleware(sockfd, &client_pid);
 921
 922     if (retval != SECURITY_SERVER_SUCCESS) {
 923         SEC_SVR_DBG("%s", "Client Authentication Failed");
 924         retval = send_generic_response(sockfd,
 925             SECURITY_SERVER_MSG_TYPE_CHECK_PID_PRIVILEGE_RESPONSE,
 926             SECURITY_SERVER_RETURN_CODE_AUTHENTICATION_FAILED);
 927
 928         if (retval != SECURITY_SERVER_SUCCESS)
 929             SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 930
 931         goto error;
 932     }
 933
 934     //receive request
 935     retval = recv_pid_privilege_request(sockfd, datasize, &pid, &object, &access_rights);
 936
 937     if (retval == SECURITY_SERVER_ERROR_RECV_FAILED) {
 938         SEC_SVR_DBG("%s", "Receiving request failed");
 939         retval = send_generic_response(sockfd,
 940             SECURITY_SERVER_MSG_TYPE_CHECK_PID_PRIVILEGE_RESPONSE,
 941             SECURITY_SERVER_RETURN_CODE_BAD_REQUEST);
 942
 943         if (retval != SECURITY_SERVER_SUCCESS)
 944             SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 945
 946         goto error;
 947     }
 948
 949     bzero(buff, B_SIZE);
 950     if (smack_check()) {
 951         //get SMACK label of process
 952         snprintf(buff, B_SIZE, "/proc/%d/attr/current", pid);
 953
 954         fd = open(buff, O_RDONLY, 0644);
 955         if (fd < 0) {
 956             SEC_SVR_DBG("%s", "Error open()");
 957             retval = SECURITY_SERVER_ERROR_UNKNOWN;
 958             goto error;
 959         }
 960
 961         bzero(buff, B_SIZE);
 962         retval = read(fd, buff, B_SIZE);
 963         if (retval < 0) {
 964             SEC_SVR_DBG("%s", "Error read()");
 965             retval = SECURITY_SERVER_ERROR_UNKNOWN;
 966             goto error;
 967         }
 968
 969         //now we have SMACK label in buff and we call libsmack
 970         SEC_SVR_DBG("Subject label of client PID %d is: %s", pid, buff);
 971         retval = smack_have_access(buff, object, access_rights);
 972         SEC_SVR_DBG("SMACK have access returned %d", retval);
 973     } else {
 974         SEC_SVR_DBG("SMACK is not available. Subject label has not been read.");
 975         retval = 1;
 976     }
 977
 978     SEC_SVR_DBG("SS_SMACK: caller_pid=%d, subject=%s, object=%s, access=%s, result=%d", pid, buff, object, access_rights, retval);
 979
 980     if (retval == 1)   //there is permission
 981         return_code = SECURITY_SERVER_RETURN_CODE_SUCCESS;
 982     else                //there is no permission
 983         return_code = SECURITY_SERVER_RETURN_CODE_ACCESS_DENIED;
 984
 985     //send response
 986     retval = send_generic_response(sockfd,
 987             SECURITY_SERVER_MSG_TYPE_CHECK_PID_PRIVILEGE_RESPONSE,
 988             return_code);
 989
 990     if (retval != SECURITY_SERVER_SUCCESS)
 991         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
 992
 993 error:
 994     if (fd >= 0)
 995         close(fd);
 996
 997     if (object != NULL)
 998         free(object);
 999     if (access_rights != NULL)
1000         free(access_rights);
1001
1002     return retval;
1003 }
1004
1005 int process_tool_request(int client_sockfd, int server_sockfd)
1006 {
1007     int retval, argcnum = 0;
1008     char **recved_argv = NULL;
1009
1010     /* Authenticate client */
1011     retval = authenticate_developer_shell(client_sockfd);
1012     if(retval != SECURITY_SERVER_SUCCESS)
1013     {
1014         SEC_SVR_DBG("%s", "Client Authentication Failed");
1015         retval = send_generic_response(client_sockfd,
1016                 SECURITY_SERVER_MSG_TYPE_TOOL_RESPONSE,
1017                 SECURITY_SERVER_RETURN_CODE_AUTHENTICATION_FAILED);
1018         if(retval != SECURITY_SERVER_SUCCESS)
1019         {
1020             SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
1021         }
1022         goto error;
1023     }
1024
1025     /* Receive Total number of argv */
1026     retval = TEMP_FAILURE_RETRY(read(client_sockfd, &argcnum, sizeof(int)));
1027     if((retval < (int)sizeof(int)) || argcnum > (UINT_MAX/sizeof(char *))-2 || argcnum < 0)
1028     {
1029         SEC_SVR_DBG("Error: argc recieve failed: %d", retval);
1030         retval = send_generic_response(client_sockfd,
1031                 SECURITY_SERVER_MSG_TYPE_TOOL_RESPONSE,
1032                 SECURITY_SERVER_RETURN_CODE_BAD_REQUEST);
1033         if(retval != SECURITY_SERVER_SUCCESS)
1034         {
1035             SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
1036         }
1037         goto error;
1038     }
1039     argcnum += 2;
1040     recved_argv = (char **)malloc(sizeof(char *) * argcnum);
1041     if(recved_argv == NULL)
1042     {
1043         SEC_SVR_DBG("Error: malloc() failed: %d", retval);
1044         retval = send_generic_response(client_sockfd,
1045                 SECURITY_SERVER_MSG_TYPE_TOOL_RESPONSE,
1046                 SECURITY_SERVER_RETURN_CODE_SERVER_ERROR);
1047         if(retval != SECURITY_SERVER_SUCCESS)
1048         {
1049             SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
1050         }
1051         goto error;
1052     }
1053     memset(recved_argv, 0, sizeof(char *) * argcnum);
1054
1055     retval = recv_launch_tool_request(client_sockfd, argcnum-1, recved_argv);
1056     if(retval == SECURITY_SERVER_ERROR_RECV_FAILED || retval == SECURITY_SERVER_ERROR_OUT_OF_MEMORY)
1057     {
1058         SEC_SVR_DBG("%s", "Receiving request failed");
1059         retval = send_generic_response(client_sockfd,
1060                 SECURITY_SERVER_MSG_TYPE_TOOL_RESPONSE,
1061                 SECURITY_SERVER_RETURN_CODE_BAD_REQUEST);
1062         if(retval != SECURITY_SERVER_SUCCESS)
1063         {
1064             SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
1065         }
1066         goto error;
1067     }
1068     if(argcnum < 2)
1069     {
1070         SEC_SVR_DBG("Error: Too small number of argv [%d]", argcnum);
1071         retval = send_generic_response(client_sockfd,
1072                 SECURITY_SERVER_MSG_TYPE_TOOL_RESPONSE,
1073                 SECURITY_SERVER_RETURN_CODE_BAD_REQUEST);
1074         if(retval != SECURITY_SERVER_SUCCESS)
1075         {
1076             SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
1077         }
1078         goto error;
1079     }
1080     /* Execute the command */
1081     retval = execute_debug_tool(argcnum, recved_argv, server_sockfd, client_sockfd);
1082     if(retval != SECURITY_SERVER_SUCCESS)
1083     {
1084         SEC_SVR_DBG("Error: Cannot execute debug tool [%d]", retval);
1085         retval = send_generic_response(client_sockfd,
1086                 SECURITY_SERVER_MSG_TYPE_TOOL_RESPONSE,
1087                 SECURITY_SERVER_RETURN_CODE_SERVER_ERROR);
1088         if(retval != SECURITY_SERVER_SUCCESS)
1089         {
1090             SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
1091         }
1092     }
1093     else
1094     {
1095         SEC_SVR_DBG("%s", "Tool has been executed");
1096         retval = send_generic_response(client_sockfd,
1097                 SECURITY_SERVER_MSG_TYPE_TOOL_RESPONSE,
1098                 SECURITY_SERVER_RETURN_CODE_SUCCESS);
1099         if(retval != SECURITY_SERVER_SUCCESS)
1100         {
1101             SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
1102         }
1103     }
1104 error:
1105     free_argv(recved_argv, argcnum);
1106     return retval;
1107 }
1108
1109 int client_has_access(int sockfd, const char *object) {
1110     char *label = NULL;
1111     int ret = 0;
1112
1113     if (smack_check())
1114     {
1115
1116         if(smack_new_label_from_socket(sockfd, &label))
1117             return 0;
1118
1119         if (0 >= (ret = smack_have_access(label, object, "rw")))
1120             ret = 0;
1121     }
1122     free(label);
1123     return ret;
1124 }
1125
1126 void *security_server_thread(void *param)
1127 {
1128         int client_sockfd = -1, client_uid, client_pid;
1129         int server_sockfd, retval;
1130         basic_header basic_hdr;
1131         struct security_server_thread_param *my_param;
1132
1133         my_param = (struct security_server_thread_param *) param;
1134         client_sockfd = my_param->client_sockfd;
1135         server_sockfd = my_param->server_sockfd;
1136
1137         /* Receive request header */
1138         retval = recv_hdr(client_sockfd, &basic_hdr);
1139         if(retval == SECURITY_SERVER_ERROR_TIMEOUT || retval == SECURITY_SERVER_ERROR_RECV_FAILED
1140                 || retval == SECURITY_SERVER_ERROR_SOCKET)
1141         {
1142                 SEC_SVR_DBG("Receiving header error [%d]",retval);
1143                 close(client_sockfd);
1144                 client_sockfd = -1;
1145                 goto error;;
1146         }
1147
1148         if(retval != SECURITY_SERVER_SUCCESS)
1149         {
1150                 /* Response */
1151                 SEC_SVR_DBG("Receiving header error [%d]",retval);
1152                 retval = send_generic_response(client_sockfd,
1153                                 SECURITY_SERVER_MSG_TYPE_GENERIC_RESPONSE,
1154                                 SECURITY_SERVER_RETURN_CODE_BAD_REQUEST);
1155                 if(retval != SECURITY_SERVER_SUCCESS)
1156                 {
1157                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
1158                         goto error;
1159                 }
1160                 safe_server_sock_close(client_sockfd);
1161                 client_sockfd = -1;
1162                 goto error;
1163         }
1164
1165         /* Act different for request message ID */
1166         switch(basic_hdr.msg_id)
1167         {
1168                 case SECURITY_SERVER_MSG_TYPE_COOKIE_REQUEST:
1169                         SEC_SVR_DBG("%s", "Cookie request received");
1170                         process_cookie_request(client_sockfd);
1171                         break;
1172
1173                 case SECURITY_SERVER_MSG_TYPE_CHECK_PRIVILEGE_REQUEST:
1174                         SEC_SVR_DBG("%s", "Privilege check received");
1175                         process_check_privilege_request(client_sockfd);
1176                         break;
1177
1178                 case SECURITY_SERVER_MSG_TYPE_CHECK_PRIVILEGE_NEW_REQUEST:
1179                         SEC_SVR_DBG("%s", "Privilege check (new mode) received");
1180                         process_check_privilege_new_request(client_sockfd);
1181                         break;
1182
1183                 case SECURITY_SERVER_MSG_TYPE_OBJECT_NAME_REQUEST:
1184                         SEC_SVR_DBG("%s", "Get object name request received");
1185                         process_object_name_request(client_sockfd);
1186                         break;
1187
1188                 case SECURITY_SERVER_MSG_TYPE_GID_REQUEST:
1189                         SEC_SVR_DBG("%s", "Get GID received");
1190                         process_gid_request(client_sockfd, (int)basic_hdr.msg_len);
1191                         break;
1192
1193                 case SECURITY_SERVER_MSG_TYPE_PID_REQUEST:
1194                         SEC_SVR_DBG("%s", "pid request received");
1195                         process_pid_request(client_sockfd);
1196                         break;
1197
1198                 case SECURITY_SERVER_MSG_TYPE_SMACK_REQUEST:
1199                         SEC_SVR_DBG("%s", "SMACK label request received");
1200                         process_smack_request(client_sockfd);
1201                         break;
1202
1203         case SECURITY_SERVER_MSG_TYPE_CHECK_PID_PRIVILEGE_REQUEST:
1204                         SEC_SVR_DBG("%s", "PID privilege check request received");
1205             //pass data size to function
1206                         process_pid_privilege_check(client_sockfd, basic_hdr.msg_len);
1207                         break;
1208
1209                 case SECURITY_SERVER_MSG_TYPE_TOOL_REQUEST:
1210                         SEC_SVR_DBG("%s", "launch tool request received");
1211                         process_tool_request(client_sockfd, server_sockfd);
1212                         break;
1213
1214                 case SECURITY_SERVER_MSG_TYPE_VALID_PWD_REQUEST:
1215                         SEC_SVR_DBG("%s", "Server: validate password request received");
1216                         process_valid_pwd_request(client_sockfd);
1217                         break;
1218
1219                 case SECURITY_SERVER_MSG_TYPE_SET_PWD_REQUEST:
1220                         SEC_SVR_DBG("%s", "Server: set password request received");
1221                         process_set_pwd_request(client_sockfd);
1222                         break;
1223
1224                 case SECURITY_SERVER_MSG_TYPE_RESET_PWD_REQUEST:
1225                         SEC_SVR_DBG("%s", "Server: reset password request received");
1226                         process_reset_pwd_request(client_sockfd);
1227                         break;
1228
1229                 case SECURITY_SERVER_MSG_TYPE_CHK_PWD_REQUEST:
1230                         SEC_SVR_DBG("%s", "Server: check password request received");
1231                         process_chk_pwd_request(client_sockfd);
1232                         break;
1233
1234                 case SECURITY_SERVER_MSG_TYPE_SET_PWD_HISTORY_REQUEST:
1235                         SEC_SVR_DBG("%s", "Server: set password histroy request received");
1236                         process_set_pwd_history_request(client_sockfd);
1237                         break;
1238
1239                 case SECURITY_SERVER_MSG_TYPE_SET_PWD_MAX_CHALLENGE_REQUEST:
1240                     SEC_SVR_DBG("%s", "Server: set password max challenge request received");
1241                     process_set_pwd_max_challenge_request(client_sockfd);
1242                     break;
1243
1244         case SECURITY_SERVER_MSG_TYPE_SET_PWD_VALIDITY_REQUEST:
1245             SEC_SVR_DBG("%s", "Server: set password validity request received");
1246             process_set_pwd_validity_request(client_sockfd);
1247             break;
1248
1249         case SECURITY_SERVER_MSG_TYPE_APP_GIVE_ACCESS_REQUEST:
1250             if (client_has_access(client_sockfd, LABEL_SECURITY_SERVER_API_DATA_SHARE)) {
1251                 SEC_SVR_DBG("%s", "Server: app give access request received");
1252                 process_app_get_access_request(client_sockfd,
1253                     basic_hdr.msg_len - sizeof(basic_hdr));
1254             } else {
1255                 SEC_SVR_DBG("%s", "Server: app give access request received (API DENIED - request will not proceed)");
1256                 send_generic_response(client_sockfd,
1257                     SECURITY_SERVER_MSG_TYPE_GENERIC_RESPONSE,
1258                     SECURITY_SERVER_RETURN_CODE_ACCESS_DENIED);
1259             }
1260             break;
1261 /************************************************************************************************/
1262 /* Just for test. This code must be removed on release */
1263                 case SECURITY_SERVER_MSG_TYPE_GET_ALL_COOKIES_REQUEST:
1264                         SEC_SVR_DBG("%s", "all cookie info request received -- NEED TO BE DELETED ON RELEASE");
1265                         retval = authenticate_client_application(client_sockfd, &client_pid, &client_uid);
1266                         if(retval != SECURITY_SERVER_SUCCESS)
1267                         {
1268                                 SEC_SVR_DBG("%s", "Client Authentication Failed");
1269                                 retval = send_generic_response(client_sockfd,
1270                                                 SECURITY_SERVER_MSG_TYPE_GENERIC_RESPONSE,
1271                                                 SECURITY_SERVER_RETURN_CODE_AUTHENTICATION_FAILED);
1272                                 if(retval != SECURITY_SERVER_SUCCESS)
1273                                 {
1274                                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
1275                                 }
1276                                 break;
1277                         }
1278                         retval = util_process_all_cookie(client_sockfd, c_list);
1279                         if(retval != SECURITY_SERVER_SUCCESS)
1280                         {
1281                                 SEC_SVR_DBG("ERROR: Cannot send all cookie info: %d", retval);
1282                         }
1283                         break;
1284
1285                 case SECURITY_SERVER_MSG_TYPE_GET_COOKIEINFO_FROM_PID_REQUEST:
1286                         SEC_SVR_DBG("%s", "cookie info from pid request received -- NEED TO BE DELETED ON RELEASE");
1287                         if(retval != SECURITY_SERVER_SUCCESS)
1288                         {
1289                                 SEC_SVR_DBG("%s", "Client Authentication Failed");
1290                                 retval = send_generic_response(client_sockfd,
1291                                                 SECURITY_SERVER_MSG_TYPE_GENERIC_RESPONSE,
1292                                                 SECURITY_SERVER_RETURN_CODE_AUTHENTICATION_FAILED);
1293                                 if(retval != SECURITY_SERVER_SUCCESS)
1294                                 {
1295                                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
1296                                 }
1297                                 break;
1298                         }
1299                         util_process_cookie_from_pid(client_sockfd, c_list);
1300                         break;
1301
1302                 case SECURITY_SERVER_MSG_TYPE_GET_COOKIEINFO_FROM_COOKIE_REQUEST:
1303                         SEC_SVR_DBG("%s", "cookie info from cookie request received -- NEED TO BE DELETED ON RELEASE");
1304                         if(retval != SECURITY_SERVER_SUCCESS)
1305                         {
1306                                 SEC_SVR_DBG("%s", "Client Authentication Failed");
1307                                 retval = send_generic_response(client_sockfd,
1308                                                 SECURITY_SERVER_MSG_TYPE_GENERIC_RESPONSE,
1309                                                 SECURITY_SERVER_RETURN_CODE_AUTHENTICATION_FAILED);
1310                                 if(retval != SECURITY_SERVER_SUCCESS)
1311                                 {
1312                                         SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
1313                                 }
1314                                 break;
1315                         }
1316                         util_process_cookie_from_cookie(client_sockfd, c_list);
1317                         break;
1318 /************************************************************************************************/
1319
1320
1321                 default:
1322                         SEC_SVR_DBG("Unknown msg ID :%d", basic_hdr.msg_id);
1323                         /* Unknown message ID */
1324                         retval = send_generic_response(client_sockfd,
1325                         SECURITY_SERVER_MSG_TYPE_GENERIC_RESPONSE,
1326                         SECURITY_SERVER_RETURN_CODE_BAD_REQUEST);
1327                         if(retval != SECURITY_SERVER_SUCCESS)
1328                         {
1329                                 SEC_SVR_DBG("ERROR: Cannot send generic response: %d", retval);
1330                         }
1331                         break;
1332         }
1333
1334         if(client_sockfd > 0)
1335         {
1336                 safe_server_sock_close(client_sockfd);
1337                 client_sockfd = -1;
1338         }
1339
1340 error:
1341         if(client_sockfd > 0)
1342                 close(client_sockfd);
1343         thread_status[my_param->thread_status] = 0;
1344         pthread_detach(pthread_self());
1345         pthread_exit(NULL);
1346 }
1347
1348 void *security_server_main_thread(void *data)
1349 {
1350     int server_sockfd = 0, retval, client_sockfd = -1, rc;
1351     struct sigaction act, dummy;
1352     pthread_t threads[SECURITY_SERVER_NUM_THREADS];
1353     struct security_server_thread_param param[SECURITY_SERVER_NUM_THREADS];
1354
1355     (void)data;
1356
1357     SEC_SVR_DBG("%s", "Starting Security Server main thread");
1358
1359     /* security server must be executed by root */
1360     if(getuid() != 0)
1361     {
1362         fprintf(stderr, "%s\n", "You are not root. exiting...");
1363         goto error;
1364     }
1365
1366     for(retval = 0 ; retval < SECURITY_SERVER_NUM_THREADS; retval++)
1367         thread_status[retval] = 0;
1368     initiate_try();
1369
1370     /* Create and bind a Unix domain socket */
1371     retval = create_new_socket(&server_sockfd);
1372     if(retval != SECURITY_SERVER_SUCCESS)
1373     {
1374         SEC_SVR_DBG("%s", "cannot create socket. exiting...");
1375         goto error;
1376     }
1377
1378     if(listen(server_sockfd, 5) < 0)
1379     {
1380         SEC_SVR_DBG("%s", "listen() failed. exiting...");
1381         goto error;
1382     }
1383
1384     /* Create a default cookie --> Cookie for root process */
1385     c_list = create_default_cookie();
1386     if(c_list == NULL)
1387     {
1388         SEC_SVR_DBG("%s", "cannot make a default cookie. exiting...");
1389         goto error;
1390     }
1391
1392     /* Init signal handler */
1393     act.sa_handler = NULL;
1394     act.sa_sigaction = security_server_sig_child;
1395     sigemptyset(&act.sa_mask);
1396     act.sa_flags = SA_NOCLDSTOP | SA_SIGINFO;
1397
1398     if (sigaction(SIGCHLD, &act, &dummy) < 0)
1399     {
1400         SEC_SVR_DBG("%s", "cannot change session");
1401     }
1402
1403     pthread_mutex_init(&cookie_mutex, NULL);
1404
1405     while(1)
1406     {
1407         /* Accept a new client */
1408         if(client_sockfd < 0)
1409             client_sockfd = accept_client(server_sockfd);
1410
1411         if(client_sockfd == SECURITY_SERVER_ERROR_TIMEOUT)
1412             continue;
1413         if(client_sockfd < 0)
1414             goto error;
1415         SEC_SVR_DBG("Server: new connection has been accepted: %d", client_sockfd);
1416         retval = 0;
1417         while(1)
1418         {
1419             if(thread_status[retval] == 0)
1420             {
1421                 thread_status[retval] = 1;
1422                 param[retval].client_sockfd = client_sockfd;
1423                 param[retval].server_sockfd = server_sockfd;
1424                 param[retval].thread_status= retval;
1425                 SEC_SVR_DBG("Server: Creating a new thread: %d", retval);
1426                 rc =pthread_create(&threads[retval], NULL, security_server_thread, (void *)&param[retval]);
1427                 if (rc)
1428                 {
1429                     SEC_SVR_DBG("Error: Server: Cannot create thread:%d", rc);
1430                     goto error;
1431                 }
1432                 break;
1433             }
1434             retval++;
1435             if(retval >= SECURITY_SERVER_NUM_THREADS)
1436                 retval = 0;
1437         }
1438         client_sockfd = -1;
1439     }
1440 error:
1441     if(server_sockfd > 0)
1442         close(server_sockfd);
1443
1444     pthread_detach(pthread_self());
1445     pthread_exit(NULL);
1446 }
1447
1448 ssize_t read_wrapper(int sockfd, void *buffer, size_t len) {
1449     unsigned char *buff = (unsigned char *)buffer;
1450     ssize_t done = 0;
1451     while(done < (int)len) {
1452         struct pollfd fds = { sockfd, POLLIN, 0};
1453         if (0 >= poll(&fds, 1, 1000))
1454             break;
1455         ssize_t ret = read(sockfd, buff+done, len-done);
1456         if (0 < ret) {
1457             done += ret;
1458             continue;
1459         }
1460         if (0 == ret)
1461             break;
1462         if (-1 == ret && EAGAIN != errno && EINTR != errno)
1463             break;
1464     }
1465     return done;
1466 }
1467
1468 int process_app_get_access_request(int sockfd, size_t msg_len)
1469 {
1470     char *message_buffer = NULL;
1471     char *client_label = NULL;
1472     char *provider_label = NULL;
1473     int ret = SECURITY_SERVER_ERROR_SERVER_ERROR;
1474     int send_message_id = SECURITY_SERVER_MSG_TYPE_GENERIC_RESPONSE;
1475     int send_error_id = SECURITY_SERVER_RETURN_CODE_SERVER_ERROR;
1476     int client_pid = 0;
1477
1478     message_buffer = malloc(msg_len+1);
1479     if (!message_buffer)
1480         return SECURITY_SERVER_ERROR_OUT_OF_MEMORY;
1481     message_buffer[msg_len] = 0;
1482
1483     ssize_t retval = read_wrapper(sockfd, message_buffer, msg_len);
1484
1485     if (retval < (ssize_t)msg_len) {
1486         SEC_SVR_DBG("%s", "Error in read. Message too short");
1487         send_error_id = SECURITY_SERVER_RETURN_CODE_BAD_REQUEST;
1488         ret = SECURITY_SERVER_ERROR_BAD_REQUEST;
1489         goto error;
1490     }
1491
1492     memcpy(&client_pid, message_buffer, sizeof(int));
1493     client_label = message_buffer + sizeof(int);
1494
1495     if (smack_check()) {
1496         if (0 != smack_new_label_from_socket(sockfd, &provider_label)) {
1497             SEC_SVR_DBG("%s", "Error in smack_new_label_from_socket");
1498             goto error;
1499         }
1500
1501         if (PC_OPERATION_SUCCESS != app_give_access(client_label, provider_label, "rwxat")) {
1502             SEC_SVR_DBG("%s", "Error in app_give_access");
1503             goto error;
1504         }
1505     }
1506
1507     ret = SECURITY_SERVER_SUCCESS;
1508     send_message_id = SECURITY_SERVER_MSG_TYPE_APP_GIVE_ACCESS_RESPONSE;
1509     send_error_id = SECURITY_SERVER_RETURN_CODE_SUCCESS;
1510
1511     if (!netlink_enabled) {
1512         SEC_SVR_DBG("Netlink not supported: Garbage collector inactive.");
1513         goto error;
1514     }
1515
1516     if (smack_check()) {
1517         if (0 != rules_revoker_add(client_pid, client_label, provider_label))
1518             SEC_SVR_DBG("%s", "Error in rules_revoker_add.");
1519     }
1520
1521 error:
1522     retval = send_generic_response(sockfd, send_message_id, send_error_id);
1523     if(retval != SECURITY_SERVER_SUCCESS)
1524         SEC_SVR_DBG("Server ERROR: Cannot send response: %d", retval);
1525
1526     free(message_buffer);
1527     free(provider_label);
1528     return ret;
1529 }
1530
1531 void *system_observer_main_thread(void *data) {
1532     system_observer_main(data);
1533     SEC_SVR_DBG("%s", "System observer: exit. No garbage collector support.");
1534     netlink_enabled = 0;
1535     pthread_detach(pthread_self());
1536     pthread_exit(NULL);
1537 }
1538
1539 int main(int argc, char* argv[])
1540 {
1541     int res;
1542     pthread_t main_thread;
1543
1544     (void)argc;
1545     (void)argv;
1546
1547     // create observer thread only if smack is enabled
1548     if (smack_check()) {
1549         pthread_t system_observer;
1550         system_observer_config so_config;
1551         so_config.event_callback = rules_revoker_callback;
1552
1553         res = pthread_create(&system_observer, NULL, system_observer_main_thread, (void*)&so_config);
1554
1555         if (res != 0)
1556             return -1;
1557     }
1558     else {
1559         SEC_SVR_DBG("SMACK is not available. Observer thread disabled.");
1560     }
1561
1562     res = pthread_create(&main_thread, NULL, security_server_main_thread, NULL);
1563     if (res == 0)
1564     {
1565         while (1)
1566             sleep(60);
1567     }
1568     else
1569     {
1570         SEC_SVR_DBG("Error: Server: Cannot create main security server thread: %d", res);
1571     }
1572     pthread_exit(NULL);
1573     return 0;
1574 }
1575