The Tor Browser: netwerk/srtp/src/crypto/kernel/crypto

netwerk/srtp/src/crypto/kernel/crypto_kernel.c@6474c204b198 (annotated)

netwerk/srtp/src/crypto/kernel/crypto_kernel.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*
  * crypto_kernel.c
  *
  * header for the cryptographic kernel
  *
  * David A. McGrew
  * Cisco Systems, Inc.
  */
 /*
  *
  * Copyright(c) 2001-2006 Cisco Systems, Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  *   Redistributions of source code must retain the above copyright
  *   notice, this list of conditions and the following disclaimer.
  *
  *   Redistributions in binary form must reproduce the above
  *   copyright notice, this list of conditions and the following
  *   disclaimer in the documentation and/or other materials provided
  *   with the distribution.
  *
  *   Neither the name of the Cisco Systems, Inc. nor the names of its
  *   contributors may be used to endorse or promote products derived
  *   from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
 #include "alloc.h"
 #include "crypto_kernel.h"
 /* the debug module for the crypto_kernel */
 debug_module_t mod_crypto_kernel = {
 ,                  /* debugging is off by default */
   "crypto kernel"     /* printable name for module   */
 };
 /*
  * other debug modules that can be included in the kernel
  */
 extern debug_module_t mod_auth;
 extern debug_module_t mod_cipher;
 extern debug_module_t mod_stat;
 extern debug_module_t mod_alloc;
 /*
  * cipher types that can be included in the kernel
  */
 extern cipher_type_t null_cipher;
 extern cipher_type_t aes_icm;
 extern cipher_type_t aes_cbc;
 /*
  * auth func types that can be included in the kernel
  */
 extern auth_type_t null_auth;
 extern auth_type_t hmac;
 /* crypto_kernel is a global variable, the only one of its datatype */
 crypto_kernel_t
 crypto_kernel = {
   crypto_kernel_state_insecure,    /* start off in insecure state */
   NULL,                            /* no cipher types yet         */
   NULL,                            /* no auth types yet           */
   NULL                             /* no debug modules yet        */
 };
 #define MAX_RNG_TRIALS 25
 err_status_t
 crypto_kernel_init() {
   err_status_t status;
   /* check the security state */
   if (crypto_kernel.state == crypto_kernel_state_secure) {
     /*
      * we're already in the secure state, but we've been asked to
      * re-initialize, so we just re-run the self-tests and then return
      */
     return crypto_kernel_status();
   }
   /* initialize error reporting system */
   status = err_reporting_init("crypto");
   if (status)
     return status;
   /* load debug modules */
   status = crypto_kernel_load_debug_module(&mod_crypto_kernel);
   if (status)
     return status;
   status = crypto_kernel_load_debug_module(&mod_auth);
   if (status)
     return status;
   status = crypto_kernel_load_debug_module(&mod_cipher);
   if (status)
     return status;
   status = crypto_kernel_load_debug_module(&mod_stat);
   if (status)
     return status;
   status = crypto_kernel_load_debug_module(&mod_alloc);
   if (status)
     return status;
   /* initialize random number generator */
   status = rand_source_init();
   if (status)
     return status;
   /* run FIPS-140 statistical tests on rand_source */
   status = stat_test_rand_source_with_repetition(rand_source_get_octet_string, MAX_RNG_TRIALS);
   if (status)
     return status;
   /* initialize pseudorandom number generator */
   status = ctr_prng_init(rand_source_get_octet_string);
   if (status)
     return status;
   /* run FIPS-140 statistical tests on ctr_prng */
   status = stat_test_rand_source_with_repetition(ctr_prng_get_octet_string, MAX_RNG_TRIALS);
   if (status)
     return status;
   /* load cipher types */
   status = crypto_kernel_load_cipher_type(&null_cipher, NULL_CIPHER);
   if (status)
     return status;
   status = crypto_kernel_load_cipher_type(&aes_icm, AES_ICM);
   if (status)
     return status;
   status = crypto_kernel_load_cipher_type(&aes_cbc, AES_CBC);
   if (status)
     return status;
   /* load auth func types */
   status = crypto_kernel_load_auth_type(&null_auth, NULL_AUTH);
   if (status)
     return status;
   status = crypto_kernel_load_auth_type(&hmac, HMAC_SHA1);
   if (status)
     return status;
   /* change state to secure */
   crypto_kernel.state = crypto_kernel_state_secure;
   return err_status_ok;
 }
 err_status_t
 crypto_kernel_status() {
   err_status_t status;
   kernel_cipher_type_t  *ctype = crypto_kernel.cipher_type_list;
   kernel_auth_type_t    *atype = crypto_kernel.auth_type_list;
   kernel_debug_module_t *dm    = crypto_kernel.debug_module_list;
   /* run FIPS-140 statistical tests on rand_source */
   printf("testing rand_source...");
   status = stat_test_rand_source_with_repetition(rand_source_get_octet_string, MAX_RNG_TRIALS);
   if (status) {
     printf("failed\n");
     crypto_kernel.state = crypto_kernel_state_insecure;
     return status;
   }
   printf("passed\n");
   /* for each cipher type, describe and test */
   while(ctype != NULL) {
     printf("cipher: %s\n", ctype->cipher_type->description);
     printf("  instance count: %d\n", ctype->cipher_type->ref_count);
     printf("  self-test: ");
     status = cipher_type_self_test(ctype->cipher_type);
     if (status) {
       printf("failed with error code %d\n", status);
       exit(status);
     }
     printf("passed\n");
     ctype = ctype->next;
   }
   /* for each auth type, describe and test */
   while(atype != NULL) {
     printf("auth func: %s\n", atype->auth_type->description);
     printf("  instance count: %d\n", atype->auth_type->ref_count);
     printf("  self-test: ");
     status = auth_type_self_test(atype->auth_type);
     if (status) {
       printf("failed with error code %d\n", status);
       exit(status);
     }
     printf("passed\n");
     atype = atype->next;
   }
   /* describe each debug module */
   printf("debug modules loaded:\n");
   while (dm != NULL) {
     printf("  %s ", dm->mod->name);
     if (dm->mod->on)
       printf("(on)\n");
     else
       printf("(off)\n");
     dm = dm->next;
   }
   return err_status_ok;
 }
 err_status_t
 crypto_kernel_list_debug_modules() {
   kernel_debug_module_t *dm = crypto_kernel.debug_module_list;
   /* describe each debug module */
   printf("debug modules loaded:\n");
   while (dm != NULL) {
     printf("  %s ", dm->mod->name);
     if (dm->mod->on)
       printf("(on)\n");
     else
       printf("(off)\n");
     dm = dm->next;
   }
   return err_status_ok;
 }
 err_status_t
 crypto_kernel_shutdown() {
   err_status_t status;
   /*
    * free dynamic memory used in crypto_kernel at present
    */
   /* walk down cipher type list, freeing memory */
   while (crypto_kernel.cipher_type_list != NULL) {
     kernel_cipher_type_t *ctype = crypto_kernel.cipher_type_list;
     crypto_kernel.cipher_type_list = ctype->next;
     debug_print(mod_crypto_kernel,
 		"freeing memory for cipher %s",
 		ctype->cipher_type->description);
     crypto_free(ctype);
   }
   /* walk down authetication module list, freeing memory */
   while (crypto_kernel.auth_type_list != NULL) {
      kernel_auth_type_t *atype = crypto_kernel.auth_type_list;
      crypto_kernel.auth_type_list = atype->next;
      debug_print(mod_crypto_kernel,
 		"freeing memory for authentication %s",
 		atype->auth_type->description);
      crypto_free(atype);
   }
   /* walk down debug module list, freeing memory */
   while (crypto_kernel.debug_module_list != NULL) {
     kernel_debug_module_t *kdm = crypto_kernel.debug_module_list;
     crypto_kernel.debug_module_list = kdm->next;
     debug_print(mod_crypto_kernel,
 		"freeing memory for debug module %s",
 		kdm->mod->name);
     crypto_free(kdm);
   }
   /* de-initialize random number generator */  status = rand_source_deinit();
   if (status)
     return status;
   /* return to insecure state */
   crypto_kernel.state = crypto_kernel_state_insecure;
   return err_status_ok;
 }
 static inline err_status_t
 crypto_kernel_do_load_cipher_type(cipher_type_t *new_ct, cipher_type_id_t id,
 				  int replace) {
   kernel_cipher_type_t *ctype, *new_ctype;
   err_status_t status;
   /* defensive coding */
   if (new_ct == NULL)
     return err_status_bad_param;
   if (new_ct->id != id)
     return err_status_bad_param;
   /* check cipher type by running self-test */
   status = cipher_type_self_test(new_ct);
   if (status) {
     return status;
   }
   /* walk down list, checking if this type is in the list already  */
   ctype = crypto_kernel.cipher_type_list;
   while (ctype != NULL) {
     if (id == ctype->id) {
       if (!replace)
 	return err_status_bad_param;
       status = cipher_type_test(new_ct, ctype->cipher_type->test_data);
       if (status)
 	return status;
       new_ctype = ctype;
       break;
     }
     else if (new_ct == ctype->cipher_type)
       return err_status_bad_param;
     ctype = ctype->next;
   }
   /* if not found, put new_ct at the head of the list */
   if (ctype == NULL) {
   /* allocate memory */
     new_ctype = (kernel_cipher_type_t *) crypto_alloc(sizeof(kernel_cipher_type_t));
     if (new_ctype == NULL)
       return err_status_alloc_fail;
     new_ctype->next = crypto_kernel.cipher_type_list;
     /* set head of list to new cipher type */
     crypto_kernel.cipher_type_list = new_ctype;
   }
   /* set fields */
   new_ctype->cipher_type = new_ct;
   new_ctype->id = id;
   /* load debug module, if there is one present */
   if (new_ct->debug != NULL)
     crypto_kernel_load_debug_module(new_ct->debug);
   /* we could check for errors here */
   return err_status_ok;
 }
 err_status_t
 crypto_kernel_load_cipher_type(cipher_type_t *new_ct, cipher_type_id_t id) {
   return crypto_kernel_do_load_cipher_type(new_ct, id, 0);
 }
 err_status_t
 crypto_kernel_replace_cipher_type(cipher_type_t *new_ct, cipher_type_id_t id) {
   return crypto_kernel_do_load_cipher_type(new_ct, id, 1);
 }
 err_status_t
 crypto_kernel_do_load_auth_type(auth_type_t *new_at, auth_type_id_t id,
 				int replace) {
   kernel_auth_type_t *atype, *new_atype;
   err_status_t status;
   /* defensive coding */
   if (new_at == NULL)
     return err_status_bad_param;
   if (new_at->id != id)
     return err_status_bad_param;
   /* check auth type by running self-test */
   status = auth_type_self_test(new_at);
   if (status) {
     return status;
   }
   /* walk down list, checking if this type is in the list already  */
   atype = crypto_kernel.auth_type_list;
   while (atype != NULL) {
     if (id == atype->id) {
       if (!replace)
 	return err_status_bad_param;
       status = auth_type_test(new_at, atype->auth_type->test_data);
       if (status)
 	return status;
       new_atype = atype;
       break;
     }
     else if (new_at == atype->auth_type)
       return err_status_bad_param;
     atype = atype->next;
   }
   /* if not found, put new_at at the head of the list */
   if (atype == NULL) {
     /* allocate memory */
     new_atype = (kernel_auth_type_t *)crypto_alloc(sizeof(kernel_auth_type_t));
     if (new_atype == NULL)
       return err_status_alloc_fail;
     new_atype->next = crypto_kernel.auth_type_list;
     /* set head of list to new auth type */
     crypto_kernel.auth_type_list = new_atype;
   }
   /* set fields */
   new_atype->auth_type = new_at;
   new_atype->id = id;
   /* load debug module, if there is one present */
   if (new_at->debug != NULL)
     crypto_kernel_load_debug_module(new_at->debug);
   /* we could check for errors here */
   return err_status_ok;
 }
 err_status_t
 crypto_kernel_load_auth_type(auth_type_t *new_at, auth_type_id_t id) {
   return crypto_kernel_do_load_auth_type(new_at, id, 0);
 }
 err_status_t
 crypto_kernel_replace_auth_type(auth_type_t *new_at, auth_type_id_t id) {
   return crypto_kernel_do_load_auth_type(new_at, id, 1);
 }
 cipher_type_t *
 crypto_kernel_get_cipher_type(cipher_type_id_t id) {
   kernel_cipher_type_t *ctype;
   /* walk down list, looking for id  */
   ctype = crypto_kernel.cipher_type_list;
   while (ctype != NULL) {
     if (id == ctype->id)
       return ctype->cipher_type;
     ctype = ctype->next;
   }
   /* haven't found the right one, indicate failure by returning NULL */
   return NULL;
 }
 err_status_t
 crypto_kernel_alloc_cipher(cipher_type_id_t id,
 			      cipher_pointer_t *cp,
 			      int key_len) {
   cipher_type_t *ct;
   /*
    * if the crypto_kernel is not yet initialized, we refuse to allocate
    * any ciphers - this is a bit extra-paranoid
    */
   if (crypto_kernel.state != crypto_kernel_state_secure)
     return err_status_init_fail;
   ct = crypto_kernel_get_cipher_type(id);
   if (!ct)
     return err_status_fail;
   return ((ct)->alloc(cp, key_len));
 }
 auth_type_t *
 crypto_kernel_get_auth_type(auth_type_id_t id) {
   kernel_auth_type_t *atype;
   /* walk down list, looking for id  */
   atype = crypto_kernel.auth_type_list;
   while (atype != NULL) {
     if (id == atype->id)
       return atype->auth_type;
     atype = atype->next;
   }
   /* haven't found the right one, indicate failure by returning NULL */
   return NULL;
 }
 err_status_t
 crypto_kernel_alloc_auth(auth_type_id_t id,
 			 auth_pointer_t *ap,
 			 int key_len,
 			 int tag_len) {
   auth_type_t *at;
   /*
    * if the crypto_kernel is not yet initialized, we refuse to allocate
    * any auth functions - this is a bit extra-paranoid
    */
   if (crypto_kernel.state != crypto_kernel_state_secure)
     return err_status_init_fail;
   at = crypto_kernel_get_auth_type(id);
   if (!at)
     return err_status_fail;
   return ((at)->alloc(ap, key_len, tag_len));
 }
 err_status_t
 crypto_kernel_load_debug_module(debug_module_t *new_dm) {
   kernel_debug_module_t *kdm, *new;
   /* defensive coding */
   if (new_dm == NULL)
     return err_status_bad_param;
   /* walk down list, checking if this type is in the list already  */
   kdm = crypto_kernel.debug_module_list;
   while (kdm != NULL) {
     if (strncmp(new_dm->name, kdm->mod->name, 64) == 0)
       return err_status_bad_param;
     kdm = kdm->next;
   }
   /* put new_dm at the head of the list */
   /* allocate memory */
   new = (kernel_debug_module_t *)crypto_alloc(sizeof(kernel_debug_module_t));
   if (new == NULL)
     return err_status_alloc_fail;
   /* set fields */
   new->mod = new_dm;
   new->next = crypto_kernel.debug_module_list;
   /* set head of list to new cipher type */
   crypto_kernel.debug_module_list = new;
   return err_status_ok;
 }
 err_status_t
 crypto_kernel_set_debug_module(char *name, int on) {
   kernel_debug_module_t *kdm;
   /* walk down list, checking if this type is in the list already  */
   kdm = crypto_kernel.debug_module_list;
   while (kdm != NULL) {
     if (strncmp(name, kdm->mod->name, 64) == 0) {
       kdm->mod->on = on;
       return err_status_ok;
     }
     kdm = kdm->next;
   }
   return err_status_fail;
 }
 err_status_t
 crypto_get_random(unsigned char *buffer, unsigned int length) {
   if (crypto_kernel.state == crypto_kernel_state_secure)
     return ctr_prng_get_octet_string(buffer, length);
   else
     return err_status_fail;
 }

The Tor Browser / annotate

netwerk/srtp/src/crypto/kernel/crypto_kernel.c@6474c204b198 (annotated)

netwerk/srtp/src/crypto/kernel/crypto_kernel.c