aheinecke@137: /**
aheinecke@137:  * @file main.c
aheinecke@137:  * @brief Main entry point for the cinst process.
aheinecke@25:  *
aheinecke@25:  *  The cinst process may or may not be run with elevated
aheinecke@25:  *  privileges. When run with elevated privileges this
aheinecke@25:  *  process will modify system wide certificate stores.
aheinecke@25:  *  Otherwise only the users certificate stores are modified.
aheinecke@25:  *
aheinecke@59:  *  It expects a certificatelist on stdin enclosed in a
aheinecke@59:  *  -----BEGIN CERTIFICATE LIST-----
aheinecke@59:  *  ...
aheinecke@59:  *  -----END CERTIFICATE LIST-----
aheinecke@59:  *
aheinecke@59:  *  Followed by additional instruction lines of:
aheinecke@59:  *  I:<certificate>
aheinecke@59:  *  R:<certificate>
aheinecke@59:  *
aheinecke@59:  *  It will only execute the instructions if the
aheinecke@59:  *  I and R instructions are also part of the signed
aheinecke@59:  *  certificate list. The signature is validated with the
aheinecke@59:  *  built in key.
aheinecke@59:  *
aheinecke@59:  *  The special instruction "UNINSTALL" will cause the installer
aheinecke@59:  *  to remove all certificates (Even those marked with I) that
aheinecke@59:  *  are part of the list to be removed.
aheinecke@25:  *
aheinecke@25:  **/
aheinecke@25: #include <stdio.h>
aheinecke@64: #include <stdlib.h>
aheinecke@59: #include <string.h>
aheinecke@59: #include <assert.h>
aheinecke@148: #include <stdbool.h>
aheinecke@59: 
aheinecke@59: #include "strhelp.h"
aheinecke@59: #include "listutil.h"
aheinecke@60: #include "errorcodes.h"
aheinecke@137: #include "windowsstore.h"
aheinecke@125: 
aheinecke@68: /* The certificate list + instructions may only be so long as
aheinecke@68:  * twice the accepted certificatelist size */
aheinecke@68: #define MAX_INPUT_SIZE MAX_LINE_LENGTH * MAX_LINES * 2
aheinecke@68: 
aheinecke@59: /* @brief Read stdin into data structures.
aheinecke@59:  *
aheinecke@59:  * Reads from stdin and sorts the input into the respective
aheinecke@59:  * variables. The pointers returned need to be freed by the caller.
aheinecke@59:  * Terminates in OOM conditions.
aheinecke@59:  *
aheinecke@60:  * The caller needs to free the memory allocated by this function
aheinecke@60:  * even when an error is returned.
aheinecke@60:  *
aheinecke@148:  * Uninstall certificates are all certificates that are pa
aheinecke@148:  *
aheinecke@148:  * @param[out] certificate_list the parsed certificate list
aheinecke@148:  * @param[out] to_install strv of installation instructions or NULL
aheinecke@148:  * @param[out] to_remove strv of remove instructions or NULL
aheinecke@148:  * @param[out] all_certs strv of uninstallation instructions or NULL
aheinecke@148:  *
aheinecke@60:  * @returns: 0 on success. An error code otherwise.
aheinecke@59:  */
aheinecke@163: int
aheinecke@163: readInput (char **certificate_list, char ***to_install,
aheinecke@163:            char ***to_remove, char ***all_certs)
aheinecke@59: {
aheinecke@163:   int lines_read = 0;
aheinecke@163:   int readingList = 0;
aheinecke@163:   size_t list_size = 0;
aheinecke@163:   char buf[MAX_LINE_LENGTH + 2];
aheinecke@59: 
aheinecke@163:   if (*certificate_list || *to_install || *to_remove)
aheinecke@163:     {
aheinecke@163:       printf ("Error invalid parameters\n");
aheinecke@163:       return -1;
aheinecke@90:     }
aheinecke@90: 
aheinecke@163:   while (fgets (buf, MAX_LINE_LENGTH + 1, stdin) )
aheinecke@163:     {
aheinecke@163:       size_t len = strlen (buf);	/* fgets ensures buf is terminated */
aheinecke@163:       if (len <= 3)
aheinecke@163:         {
aheinecke@163:           printf ("Line too short.\n");
aheinecke@163:           return ERR_INVALID_INPUT;
aheinecke@91:         }
aheinecke@163:       if (lines_read++ > MAX_LINES)
aheinecke@163:         {
aheinecke@163:           printf ("Too many lines\n");
aheinecke@163:           return ERR_TOO_MUCH_INPUT;
aheinecke@59:         }
aheinecke@126: 
aheinecke@163:       if (buf[len - 2] != '\r')
aheinecke@163:         {
aheinecke@163:           if (buf[len - 1] != '\n')
aheinecke@163:             {
aheinecke@163:               printf ("Line too long.\n");
aheinecke@163:               return ERR_INVALID_INPUT;
aheinecke@126:             }
aheinecke@163:           buf[len - 1] = '\r';
aheinecke@163:           buf[len] = '\n';
aheinecke@163:           buf[len + 1] = '\0';
aheinecke@163:           len++;
aheinecke@126:         }
aheinecke@126: 
aheinecke@163:       if (strcmp ("-----BEGIN CERTIFICATE LIST-----\r\n", buf) == 0)
aheinecke@163:         {
aheinecke@163:           readingList = 1;
aheinecke@163:           continue;
aheinecke@59:         }
aheinecke@163:       if (strcmp ("-----END CERTIFICATE LIST-----\r\n", buf) == 0)
aheinecke@163:         {
aheinecke@163:           readingList = 0;
aheinecke@163:           continue;
aheinecke@59:         }
aheinecke@163:       if (readingList)
aheinecke@163:         {
aheinecke@163:           str_append_str (certificate_list, &list_size, buf, len);
aheinecke@59:         }
aheinecke@163:       else if (strcmp ("UNINSTALL\r\n", buf) == 0)
aheinecke@163:         {
aheinecke@163:           /* Remove trailing \r\n */
aheinecke@163:           strv_append (to_remove, buf, len - 2);
aheinecke@163:           continue;
aheinecke@163:         }
aheinecke@163:       if (*buf == 'I')
aheinecke@163:         {
aheinecke@163:           /* Remove leading I: and trailing \r\n */
andre@216:           strv_append (readingList ? all_certs : to_install, buf + 2, len - 4);
aheinecke@163:           continue;
aheinecke@163:         }
aheinecke@163:       if (*buf == 'R')
aheinecke@163:         {
aheinecke@163:           /* Remove leading R: and trailing \r\n */
aheinecke@163:           strv_append (readingList ? all_certs : to_remove, buf + 2, len - 4);
aheinecke@163:           continue;
aheinecke@59:         }
aheinecke@59:     }
aheinecke@59: 
aheinecke@163:   return 0;
aheinecke@59: }
aheinecke@148: 
aheinecke@148: /** @brief Check that the insturctions match to the list
aheinecke@148:  *
aheinecke@148:  * Only certificates part of the certificate_list are allowed
aheinecke@148:  * for installation.
aheinecke@148:  *
aheinecke@148:  * @param[in] all_certs strv of all valid certificates in a list
aheinecke@148:  * @param[in] to_validate strv of instructions
aheinecke@148:  *
aheinecke@148:  * @returns 0 on success, an error otherwise
aheinecke@148:  */
aheinecke@163: int
aheinecke@163: validate_instructions (char **all_certs, char **to_validate)
aheinecke@64: {
aheinecke@163:   int i = 0, j = 0;
aheinecke@148: 
aheinecke@163:   if (!all_certs || strv_length (all_certs) < 1)
aheinecke@163:     {
aheinecke@163:       /* Invalid parameters */
aheinecke@163:       return -1;
aheinecke@148:     }
aheinecke@148: 
aheinecke@163:   if (to_validate == NULL)
aheinecke@163:     {
aheinecke@163:       /* Nothing is valid */
aheinecke@163:       return 0;
aheinecke@148:     }
aheinecke@148: 
aheinecke@163:   for (i = 0; to_validate[i]; i++)
aheinecke@163:     {
aheinecke@163:       bool found = false;
aheinecke@163:       for (j = 0; all_certs[j]; j++)
aheinecke@163:         {
aheinecke@163:           if (strncmp (to_validate[i], all_certs[j], MAX_LINE_LENGTH - 2) ==
aheinecke@163:               0)
aheinecke@163:             {
aheinecke@163:               found = true;
aheinecke@163:               break;
aheinecke@148:             }
aheinecke@148:         }
aheinecke@163:       if (!found)
aheinecke@163:         {
aheinecke@163:           printf ("Install instruction with invalid certificate\n.");
aheinecke@163:           return ERR_INVALID_INSTRUCTIONS;
aheinecke@148:         }
aheinecke@148:     }
aheinecke@65: 
aheinecke@163:   return 0;
aheinecke@64: }
aheinecke@148: 
aheinecke@68: 
aheinecke@163: int
aheinecke@163: main ()
aheinecke@163: {
aheinecke@163:   char **to_install = NULL;
aheinecke@163:   char **to_remove = NULL;
aheinecke@163:   char **all_certs = NULL;
aheinecke@163:   char *certificate_list = NULL;
aheinecke@163:   size_t list_len = 0;
aheinecke@163:   int ret = -1;
aheinecke@163:   bool uninstall = false;
aheinecke@60: 
aheinecke@163:   ret = readInput (&certificate_list, &to_install, &to_remove, &all_certs);
aheinecke@148: 
aheinecke@163:   if (ret)
aheinecke@163:     {
aheinecke@163:       return ret;
aheinecke@60:     }
aheinecke@60: 
aheinecke@163:   if (!certificate_list)
aheinecke@163:     {
aheinecke@163:       return ERR_INVALID_INPUT_NO_LIST;
aheinecke@60:     }
aheinecke@59: 
aheinecke@163:   list_len = strnlen (certificate_list, MAX_INPUT_SIZE);
aheinecke@59: 
aheinecke@163:   ret = verify_list (certificate_list, list_len);
aheinecke@64: 
aheinecke@163:   if (ret)
aheinecke@163:     {
aheinecke@163:       return ERR_INVALID_SIGNATURE;
aheinecke@64:     }
aheinecke@64: 
aheinecke@163:   if (!strv_length (to_install) && !strv_length (to_remove) )
aheinecke@163:     {
aheinecke@163:       return ERR_NO_INSTRUCTIONS;
aheinecke@64:     }
aheinecke@64: 
aheinecke@68: 
aheinecke@163:   /* Check that the instructions are ok to execute */
aheinecke@163:   if (to_install)
aheinecke@163:     {
aheinecke@163:       ret = validate_instructions (all_certs, to_install);
aheinecke@163:       if (ret)
aheinecke@163:         {
aheinecke@163:           return ret;
aheinecke@148:         }
aheinecke@64:     }
aheinecke@68: 
aheinecke@163:   if (to_remove)
aheinecke@163:     {
aheinecke@163:       if (to_remove[0]
aheinecke@163:           && strncmp ("UNINSTALL", to_remove[0], MAX_LINE_LENGTH) == 0)
aheinecke@163:         {
aheinecke@163:           uninstall = true;
aheinecke@163:           strv_free (to_remove);
aheinecke@163:           to_remove = NULL;
aheinecke@163:         }
aheinecke@163:       else
aheinecke@163:         {
aheinecke@163:           ret = validate_instructions (all_certs, to_remove);
aheinecke@163:           if (ret)
aheinecke@163:             {
aheinecke@163:               return ret;
aheinecke@68:             }
aheinecke@68:         }
aheinecke@68:     }
aheinecke@68: 
aheinecke@163:   if (uninstall)
aheinecke@163:     {
aheinecke@163:       /* To uninstall does not have to be verified as it part of the
aheinecke@163:        * signed list.*/
aheinecke@163:       to_remove = all_certs;
aheinecke@163:     }
aheinecke@163:   else
aheinecke@163:     {
aheinecke@163:       strv_free (all_certs);
aheinecke@163:       all_certs = NULL;
aheinecke@68:     }
aheinecke@68: 
aheinecke@68: #ifdef WIN32
aheinecke@247:   return write_stores_win (to_install, to_remove);
aheinecke@68: #endif
aheinecke@68: 
aheinecke@163:   /* Make valgrind happy */
aheinecke@163:   strv_free (to_install);
aheinecke@163:   strv_free (to_remove);
aheinecke@163:   free (certificate_list);
aheinecke@59: 
aheinecke@163:   return 0;
aheinecke@25: }