mirror of
https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-11-30 15:43:32 +01:00
removed onion.c and onion.h from common/
they're now in or/onion.c svn:r21
This commit is contained in:
Roger Dingledine
parent
873f08aa0e
commit
b34fad4d38
@ -3,12 +3,12 @@ noinst_LIBRARIES = libor.a
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#CFLAGS = -Wall -Wpointer-arith -O2
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libor_a_SOURCES = cell.c config.c key.c log.c onion.c opcell.c \
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libor_a_SOURCES = cell.c config.c key.c log.c opcell.c \
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routent.c scheduler.c utils.c
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# ss.h is not used anywhere, distributing it just because
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noinst_HEADERS = cell.h config.h key.h log.h onion.h opcell.h \
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noinst_HEADERS = cell.h config.h key.h log.h opcell.h \
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policies.h routent.h scheduler.h utils.h \
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ss.h version.h
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@ -1,633 +0,0 @@
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/**
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* onion.c
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* Routines for creating/manipulating onions.
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*
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* Matej Pfajfar <mp292@cam.ac.uk>
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*/
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/*
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* Changes :
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* $Log$
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* Revision 1.1 2002/06/26 22:45:50 arma
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* Initial revision
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*
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* Revision 1.24 2002/06/14 20:42:02 mp292
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* Bug caused infinite loop when router list had <= 2 entries.
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*
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* Revision 1.23 2002/04/02 14:27:11 badbytes
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* Final finishes.
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*
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* Revision 1.22 2002/04/02 10:20:09 badbytes
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* Memory overflow bug.
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*
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* Revision 1.21 2002/03/25 09:11:23 badbytes
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* Added a list of onions being tracked for replay attacks.
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*
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* Revision 1.20 2002/03/12 23:32:41 mp292
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* *** empty log message ***
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*
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* Revision 1.19 2002/01/27 19:23:21 mp292
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* Fixed a bug in parameter checking.
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*
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* Revision 1.18 2002/01/26 19:24:29 mp292
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* Reviewed according to Secure-Programs-HOWTO.
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*
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* Revision 1.17 2002/01/18 20:40:40 mp292
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* Fixed a bug in en/decrypt_onion() functions.
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*
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* Revision 1.16 2002/01/17 23:48:31 mp292
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* Added some extra debugging messages to fix a bug in encrypt_onion() which
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* seems to corrupt the routent *route list.
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*
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* Revision 1.15 2002/01/17 15:00:43 mp292
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* Fixed a bug which caused malloc() generate a seg fault.
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*
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* Revision 1.14 2002/01/16 23:01:54 mp292
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* First phase of system testing completed (main functionality).
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*
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* Revision 1.13 2002/01/14 13:05:37 badbytes
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* System testing in progress.
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*
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* Revision 1.12 2002/01/11 15:47:17 badbytes
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* *** empty log message ***
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*
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* Revision 1.11 2002/01/09 07:58:23 badbytes
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* Fixed a bug so that backward crypto engines are now initialized with DecryptInit.
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*
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* Revision 1.10 2002/01/09 07:55:23 badbytes
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* Ciphers got out of sync. Hopefully fixed.
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*
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* Revision 1.9 2002/01/03 11:01:22 badbytes
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* *** empty log message ***
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*
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* Revision 1.8 2001/12/19 08:29:00 badbytes
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* Macro DEFAULT_CIPHER now holds the default crypto algorithm
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*
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* Revision 1.7 2001/12/18 14:12:47 badbytes
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* Default cipher is now IDENTITY, for testing purposes.
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*
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* Revision 1.6 2001/12/18 10:36:51 badbytes
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* create_onion() now also computes a crypt_path
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*
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* Revision 1.5 2001/12/17 13:35:17 badbytes
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* Still writing handle_connection()
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*
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* Revision 1.4 2001/12/14 14:44:37 badbytes
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* chooselen() tested
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*
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* Revision 1.3 2001/12/14 13:30:48 badbytes
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* peel_onion() was redundant, removed it
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*
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* Revision 1.2 2001/12/14 13:14:03 badbytes
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* Split types.h into routent.h and ss.h. Keeping them all in one file created unnecesary dependencies.
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*
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* Revision 1.1 2001/12/14 12:41:12 badbytes
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* Moved from op/ as it will be reused by other modules.
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*
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* Revision 1.1 2001/12/13 15:15:10 badbytes
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* Started coding the onion proxy.
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*
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*/
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include <time.h>
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#include <openssl/rand.h>
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#include <openssl/err.h>
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#include <openssl/sha.h>
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#include <openssl/evp.h>
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#include "onion.h"
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#include "log.h"
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/* uses a weighted coin with weight cw to choose a route length */
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int chooselen(double cw)
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{
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int len = 2;
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int retval = 0;
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unsigned char coin;
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if ((cw < 0) || (cw >= 1)) /* invalid parameter */
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return -1;
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while(1)
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{
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retval = RAND_pseudo_bytes(&coin,1);
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if (retval == -1)
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return -1;
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if (coin > cw*255) /* don't extend */
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break;
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else
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len++;
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}
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return len;
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}
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/* returns an array of pointers to routent that define a new route through the OR network
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* int cw is the coin weight to use when choosing the route
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* order of routers is from last to first
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*/
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unsigned int *new_route(double cw, routent_t **rarray, size_t rarray_len, size_t *rlen)
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{
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int routelen = 0;
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int i = 0;
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int retval = 0;
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unsigned int *route = NULL;
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unsigned int oldchoice, choice;
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if ( (cw >= 0) && (cw < 1) && (rarray) && (rlen) ) /* valid parameters */
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{
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routelen = chooselen(cw);
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if (routelen == -1)
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{
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log(LOG_ERR,"Choosing route length failed.");
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return NULL;
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}
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log(LOG_DEBUG,"new_route(): Chosen route length %u.",routelen);
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/* allocate memory for the new route */
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route = (unsigned int *)malloc(routelen * sizeof(unsigned int));
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if (!route)
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{
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log(LOG_ERR,"Memory allocation failed.");
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return NULL;
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}
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oldchoice = rarray_len;
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for(i=0;i<routelen;i++)
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{
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log(LOG_DEBUG,"new_route() : Choosing hop %u.",i);
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retval = RAND_pseudo_bytes((unsigned char *)&choice,sizeof(unsigned int));
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if (retval == -1)
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{
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free((void *)route);
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return NULL;
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}
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choice = choice % (rarray_len);
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log(LOG_DEBUG,"new_route() : Chosen router %u.",choice);
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if (choice == oldchoice) /* same router */
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{
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/* try again */
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i--;
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continue;
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}
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oldchoice = choice;
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route[i] = choice;
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}
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*rlen = routelen;
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return route;
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} /* valid parameters */
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else /* invalid parameters */
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return NULL;
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}
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/* creates a new onion from route, stores it and its length into bufp and lenp respectively */
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unsigned char *create_onion(routent_t **rarray, size_t rarray_len, unsigned int *route, size_t routelen, size_t *lenp, crypt_path_t **cpathp)
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{
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int i,j;
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int retval = 0;
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onion_layer_t *layer = NULL;
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crypt_path_t *hop = NULL;
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unsigned char *retbuf = NULL;
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unsigned char *bufp;
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routent_t *router;
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if ( (rarray) && (route) && (lenp) ) /* valid parameters */
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{
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/* calculate the size of the onion */
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*lenp = routelen * 28 + 100; /* 28 bytes per layer + 100 bytes padding for the innermost layer */
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log(LOG_DEBUG,"create_onion() : Size of the onion is %u.",*lenp);
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/* allocate memory for the onion */
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bufp = (unsigned char *)malloc(*lenp);
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if (!bufp)
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{
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log(LOG_ERR,"Error allocating memory.");
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return NULL;
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}
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log(LOG_DEBUG,"create_onion() : Allocated memory for the onion.");
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for (retval=0; retval<routelen;retval++)
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{
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log(LOG_DEBUG,"create_onion() : %u : %s:%u, %u/%u",routelen-retval,inet_ntoa(*((struct in_addr *)&((rarray[route[retval]])->addr))),ntohs((rarray[route[retval]])->port),(rarray[route[retval]])->pkey,RSA_size((rarray[route[retval]])->pkey));
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}
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layer = (onion_layer_t *)(bufp + *lenp - 128); /* pointer to innermost layer */
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/* create the onion layer by layer, starting with the innermost */
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for (i=0;i<routelen;i++)
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{
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router = rarray[route[i]];
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log(LOG_DEBUG,"create_onion() : %u",router);
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log(LOG_DEBUG,"create_onion() : This router is %s:%u",inet_ntoa(*((struct in_addr *)&router->addr)),ntohs(router->port));
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log(LOG_DEBUG,"create_onion() : Key pointer = %u.",router->pkey);
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log(LOG_DEBUG,"create_onion() : Key size = %u.",RSA_size(router->pkey));
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/* 0 bit */
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layer->zero = 0;
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/* version */
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layer->version = VERSION;
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/* Back F + Forw F both use DES OFB*/
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layer->backf = ONION_DEFAULT_CIPHER;
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layer->forwf = ONION_DEFAULT_CIPHER;
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/* Dest Port */
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if (i) /* not last hop */
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layer->port = rarray[route[i-1]]->port;
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else
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layer->port = 0;
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/* Dest Addr */
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if (i) /* not last hop */
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layer->addr = rarray[route[i-1]]->addr;
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else
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layer->addr = 0;
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/* Expiration Time */
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layer->expire = time(NULL) + 3600; /* NOW + 1 hour */
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/* Key Seed Material */
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retval = RAND_bytes(layer->keyseed,16);
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if (retval < 1) /* error */
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{
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log(LOG_ERR,"Error generating random data.");
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free((void *)bufp);
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if (cpathp)
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{
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for (j=0;j<i;j++)
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free((void *)cpathp[i]);
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}
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return NULL;
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}
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log(LOG_DEBUG,"create_onion() : Onion layer %u built : %u, %u, %u, %s, %u.",i+1,layer->zero,layer->backf,layer->forwf,inet_ntoa(*((struct in_addr *)&layer->addr)),ntohs(layer->port));
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/* build up the crypt_path */
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if (cpathp)
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{
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cpathp[i] = (crypt_path_t *)malloc(sizeof(crypt_path_t));
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if (!cpathp[i])
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{
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log(LOG_ERR,"Error allocating memory.");
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free((void *)bufp);
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for (j=0;j<i;j++)
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free((void *)cpathp[i]);
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}
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log(LOG_DEBUG,"create_onion() : Building hop %u of crypt path.",i+1);
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hop = cpathp[i];
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/* set crypto functions */
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hop->backf = layer->backf;
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hop->forwf = layer->forwf;
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/* calculate keys */
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SHA1(layer->keyseed,16,hop->digest3);
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log(LOG_DEBUG,"create_onion() : First SHA pass performed.");
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SHA1(hop->digest3,20,hop->digest2);
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log(LOG_DEBUG,"create_onion() : Second SHA pass performed.");
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SHA1(hop->digest2,20,hop->digest3);
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log(LOG_DEBUG,"create_onion() : Third SHA pass performed.");
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log(LOG_DEBUG,"create_onion() : Keys generated.");
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/* set IVs */
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memset((void *)hop->f_iv,0,16);
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memset((void *)hop->b_iv,0,16);
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/* initialize cipher contexts */
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EVP_CIPHER_CTX_init(&hop->f_ctx);
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EVP_CIPHER_CTX_init(&hop->b_ctx);
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/* initialize cipher engines */
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switch(layer->forwf)
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{
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case ONION_CIPHER_DES :
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retval = EVP_EncryptInit(&hop->f_ctx, EVP_des_ofb(), hop->digest3, hop->f_iv);
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break;
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case ONION_CIPHER_RC4 :
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retval = EVP_EncryptInit(&hop->f_ctx, EVP_rc4(), hop->digest3, hop->f_iv);
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break;
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case ONION_CIPHER_IDENTITY :
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retval = EVP_EncryptInit(&hop->f_ctx, EVP_enc_null(), hop->digest3, hop->f_iv);
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break;
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}
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if (!retval) /* cipher initialization failed */
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{
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log(LOG_ERR,"Could not initialize crypto engines.");
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free((void *)bufp);
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for (j=0;j<i;j++)
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free((void *)cpathp[i]);
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return NULL;
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}
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switch(layer->backf)
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{
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case ONION_CIPHER_DES :
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retval = EVP_DecryptInit(&hop->b_ctx, EVP_des_ofb(), hop->digest2, hop->b_iv);
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break;
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case ONION_CIPHER_RC4 :
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retval = EVP_DecryptInit(&hop->b_ctx, EVP_rc4(), hop->digest2, hop->b_iv);
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break;
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case ONION_CIPHER_IDENTITY :
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retval = EVP_DecryptInit(&hop->b_ctx, EVP_enc_null(), hop->digest2, hop->b_iv);
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break;
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}
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if (!retval) /* cipher initialization failed */
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{
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log(LOG_ERR,"Could not initialize crypto engines.");
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free((void *)bufp);
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for (j=0;j<i;j++)
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free((void *)cpathp[i]);
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return NULL;
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}
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log(LOG_DEBUG,"create_onion() : Built corresponding crypt path hop.");
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}
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/* padding if this is the innermost layer */
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if (!i)
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{
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retval=RAND_pseudo_bytes((unsigned char *)layer + 28,100);
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if (retval == -1) /* error */
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{
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log(LOG_ERR,"Error generating pseudo-random data.");
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free((void *)bufp);
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if (cpathp)
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{
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for (j=0;j<i;j++)
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free((void *)cpathp[i]);
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}
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return NULL;
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}
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log(LOG_DEBUG,"create_onion() : This is the innermost layer. Adding 100 bytes of padding.");
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}
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/* encrypt */
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retbuf = encrypt_onion(layer,128+(i*28),router->pkey);
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if (!retbuf)
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{
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log(LOG_ERR,"Error encrypting onion layer.");
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free((void *)bufp);
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if (cpathp)
|
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{
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for (j=0;j<i;j++)
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free((void *)cpathp[i]);
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}
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return NULL;
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}
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log(LOG_DEBUG,"create_onion() : Encrypted layer.");
|
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/* calculate pointer to next layer */
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layer = (onion_layer_t *)bufp + (routelen-i-2)*sizeof(onion_layer_t);
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}
|
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|
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return bufp;
|
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} /* valid parameters */
|
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else
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return NULL;
|
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}
|
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|
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/* encrypts 128 bytes of the onion with the specified public key, the rest with
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* DES OFB with the key as defined in the outter layer */
|
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unsigned char *encrypt_onion(onion_layer_t *onion, uint32_t onionlen, RSA *pkey)
|
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{
|
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unsigned char *tmpbuf = NULL; /* temporary buffer for crypto operations */
|
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unsigned char digest[20]; /* stores SHA1 output - 160 bits */
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unsigned char *retbuf = NULL;
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unsigned char iv[8];
|
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int retval = 0;
|
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int outlen = 0;
|
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|
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EVP_CIPHER_CTX ctx; /* cipher context */
|
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|
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if ( (onion) && (pkey) ) /* valid parameters */
|
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{
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memset((void *)iv,0,8);
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log(LOG_DEBUG,"Onion layer : %u, %u, %u, %s, %u.",onion->zero,onion->backf,onion->forwf,inet_ntoa(*((struct in_addr *)&onion->addr)),ntohs(onion->port));
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/* allocate space for tmpbuf */
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tmpbuf = (unsigned char *)malloc(onionlen);
|
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if (!tmpbuf)
|
||||
{
|
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log(LOG_ERR,"Could not allocate memory.");
|
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return NULL;
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}
|
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log(LOG_DEBUG,"encrypt_onion() : allocated %u bytes of memory for the encrypted onion (at %u).",onionlen,tmpbuf);
|
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|
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/* get key1 = SHA1(KeySeed) */
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retbuf = SHA1(((onion_layer_t *)onion)->keyseed,16,digest);
|
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if (!retbuf)
|
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{
|
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log(LOG_ERR,"Error computing SHA1 digest.");
|
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free((void *)tmpbuf);
|
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return NULL;
|
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}
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log(LOG_DEBUG,"encrypt_onion() : Computed DES key.");
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|
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log(LOG_DEBUG,"encrypt_onion() : Trying to RSA encrypt.");
|
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/* encrypt 128 bytes with RSA *pkey */
|
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retval = RSA_public_encrypt(128, (unsigned char *)onion, tmpbuf, pkey, RSA_NO_PADDING);
|
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if (retval == -1)
|
||||
{
|
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log(LOG_ERR,"Error RSA-encrypting data :%s",ERR_reason_error_string(ERR_get_error()));
|
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free((void *)tmpbuf);
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return NULL;
|
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}
|
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|
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log(LOG_DEBUG,"encrypt_onion() : RSA encrypted first 128 bytes of the onion.");
|
||||
|
||||
/* now encrypt the rest with DES OFB */
|
||||
|
||||
EVP_CIPHER_CTX_init(&ctx);
|
||||
retval = EVP_EncryptInit(&ctx,EVP_des_ofb(),digest,iv);
|
||||
if (!retval) /* error */
|
||||
{
|
||||
log(LOG_ERR,"Error initializing DES engine:%s",ERR_reason_error_string(ERR_get_error()));
|
||||
free((void *)tmpbuf);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
retval = EVP_EncryptUpdate(&ctx,(unsigned char *)tmpbuf+128,&outlen,(unsigned char *)onion+128,onionlen-128);
|
||||
if (!retval) /* error */
|
||||
{
|
||||
log(LOG_ERR,"Error performing DES encryption:%s",ERR_reason_error_string(ERR_get_error()));
|
||||
free((void *)tmpbuf);
|
||||
return NULL;
|
||||
}
|
||||
log(LOG_DEBUG,"encrypt_onion() : DES OFB encrypted the rest of the onion.");
|
||||
|
||||
EVP_CIPHER_CTX_cleanup(&ctx);
|
||||
|
||||
/* now copy tmpbuf to onion */
|
||||
memcpy((void *)onion,(void *)tmpbuf,onionlen);
|
||||
log(LOG_DEBUG,"encrypt_onion() : Copied cipher to original onion buffer.");
|
||||
free((void *)tmpbuf);
|
||||
return (unsigned char *)onion;
|
||||
} /* valid parameters */
|
||||
else
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* decrypts the first 128 bytes using RSA and prkey, decrypts the rest with DES OFB with key1 */
|
||||
unsigned char *decrypt_onion(onion_layer_t *onion, uint32_t onionlen, RSA *prkey)
|
||||
{
|
||||
void *tmpbuf = NULL; /* temporary buffer for crypto operations */
|
||||
unsigned char digest[20]; /* stores SHA1 output - 160 bits */
|
||||
unsigned char *retbuf = NULL;
|
||||
unsigned char iv[8];
|
||||
int retval = 0;
|
||||
int outlen = 0;
|
||||
|
||||
EVP_CIPHER_CTX ctx; /* cipher context */
|
||||
|
||||
if ( (onion) && (prkey) ) /* valid parameters */
|
||||
{
|
||||
memset((void *)iv,0,8);
|
||||
|
||||
/* allocate space for tmpbuf */
|
||||
tmpbuf = malloc(onionlen);
|
||||
if (!tmpbuf)
|
||||
{
|
||||
log(LOG_ERR,"Could not allocate memory.");
|
||||
return NULL;
|
||||
}
|
||||
log(LOG_DEBUG,"decrypt_onion() : Allocated memory for the temporary buffer.");
|
||||
|
||||
/* decrypt 128 bytes with RSA *prkey */
|
||||
retval = RSA_private_decrypt(128, (unsigned char*)onion, (unsigned char *)tmpbuf, prkey, RSA_NO_PADDING);
|
||||
if (retval == -1)
|
||||
{
|
||||
log(LOG_ERR,"Error RSA-decrypting data :%s",ERR_reason_error_string(ERR_get_error()));
|
||||
free((void *)tmpbuf);
|
||||
return NULL;
|
||||
}
|
||||
log(LOG_DEBUG,"decrypt_onion() : RSA decryption complete.");
|
||||
|
||||
/* get key1 = SHA1(KeySeed) */
|
||||
retbuf = SHA1(((onion_layer_t *)tmpbuf)->keyseed,16,digest);
|
||||
if (!retbuf)
|
||||
{
|
||||
log(LOG_ERR,"Error computing SHA1 digest.");
|
||||
free((void *)tmpbuf);
|
||||
return NULL;
|
||||
}
|
||||
log(LOG_DEBUG,"decrypt_onion() : Computed DES key.");
|
||||
|
||||
/* now decrypt the rest with DES OFB */
|
||||
EVP_CIPHER_CTX_init(&ctx);
|
||||
retval = EVP_DecryptInit(&ctx,EVP_des_ofb(),digest,iv);
|
||||
if (!retval) /* error */
|
||||
{
|
||||
log(LOG_ERR,"Error initializing DES engine:%s",ERR_reason_error_string(ERR_get_error()));
|
||||
free((void *)tmpbuf);
|
||||
return NULL;
|
||||
}
|
||||
retval = EVP_DecryptUpdate(&ctx,(unsigned char *)tmpbuf+128,&outlen,(unsigned char *)onion+128,onionlen-128);
|
||||
if (!retval) /* error */
|
||||
{
|
||||
log(LOG_ERR,"Error performing DES decryption:%s",ERR_reason_error_string(ERR_get_error()));
|
||||
free((void *)tmpbuf);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
EVP_CIPHER_CTX_cleanup(&ctx);
|
||||
log(LOG_DEBUG,"decrypt_onion() : DES decryption complete.");
|
||||
|
||||
/* now copy tmpbuf to onion */
|
||||
memcpy((void *)onion,(void *)tmpbuf,onionlen);
|
||||
free((void *)tmpbuf);
|
||||
return (unsigned char *)onion;
|
||||
} /* valid parameters */
|
||||
else
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* delete first n bytes of the onion and pads the end with n bytes of random data */
|
||||
void pad_onion(unsigned char *onion, uint32_t onionlen, size_t n)
|
||||
{
|
||||
if (onion) /* valid parameter */
|
||||
{
|
||||
memmove((void *)onion,(void *)(onion+n),onionlen-n);
|
||||
RAND_pseudo_bytes(onion+onionlen-n,n);
|
||||
}
|
||||
}
|
||||
|
||||
/* create a new tracked_onion entry */
|
||||
tracked_onion_t *new_tracked_onion(unsigned char *onion, uint32_t onionlen, tracked_onion_t **tracked_onions, tracked_onion_t **last_tracked_onion)
|
||||
{
|
||||
tracked_onion_t *to = NULL;
|
||||
|
||||
if (!onion || !tracked_onions || !last_tracked_onion) /* invalid parameters */
|
||||
return NULL;
|
||||
|
||||
to = (tracked_onion_t *)malloc(sizeof(tracked_onion_t));
|
||||
if (!to)
|
||||
return NULL;
|
||||
|
||||
to->expire = ((onion_layer_t *)onion)->expire; /* set the expiration date */
|
||||
/* compute the SHA digest */
|
||||
SHA1(onion, onionlen, to->digest);
|
||||
if (!to->digest)
|
||||
{
|
||||
log(LOG_DEBUG,"new_tracked_onion() : Failed to compute a SHA1 digest of the onion.");
|
||||
free((void *)to);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
to->next = NULL;
|
||||
|
||||
if (!*tracked_onions)
|
||||
{
|
||||
to->prev = NULL;
|
||||
*tracked_onions = to;
|
||||
}
|
||||
else
|
||||
{
|
||||
to->prev = (void *)*last_tracked_onion;
|
||||
(*last_tracked_onion)->next = (void *)to;
|
||||
}
|
||||
*last_tracked_onion = to;
|
||||
|
||||
return to;
|
||||
}
|
||||
|
||||
/* delete a tracked onion entry */
|
||||
void remove_tracked_onion(tracked_onion_t *to, tracked_onion_t **tracked_onions, tracked_onion_t **last_tracked_onion)
|
||||
{
|
||||
if (!*tracked_onions || !*last_tracked_onion || !to)
|
||||
return;
|
||||
|
||||
if (to->prev)
|
||||
((tracked_onion_t *)to->prev)->next = to->next;
|
||||
if (to->next)
|
||||
((tracked_onion_t *)to->next)->prev = to->prev;
|
||||
|
||||
if (to == *tracked_onions)
|
||||
*tracked_onions = (tracked_onion_t *)to->next;
|
||||
|
||||
if (to == *last_tracked_onion)
|
||||
*last_tracked_onion = (tracked_onion_t *)to->prev;
|
||||
|
||||
free((void *)to);
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
/* find a tracked onion in the linked list of tracked onions */
|
||||
tracked_onion_t *id_tracked_onion(unsigned char *onion, uint32_t onionlen, tracked_onion_t *tracked_onions)
|
||||
{
|
||||
tracked_onion_t *to = tracked_onions;
|
||||
unsigned char digest[20];
|
||||
|
||||
/* compute the SHA digest of the onion */
|
||||
SHA1(onion,onionlen, digest);
|
||||
|
||||
while(to)
|
||||
{
|
||||
if (!memcmp((void *)digest, (void *)to->digest, 20))
|
||||
return to;
|
||||
to = (tracked_onion_t *)to->next;
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
@ -1,156 +0,0 @@
|
||||
/**
|
||||
* onion.h
|
||||
* Routines for creating/manipulating onions.
|
||||
*
|
||||
* Matej Pfajfar <mp292@cam.ac.uk>
|
||||
*/
|
||||
|
||||
/*
|
||||
* Changes :
|
||||
* $Log$
|
||||
* Revision 1.1 2002/06/26 22:45:50 arma
|
||||
* Initial revision
|
||||
*
|
||||
* Revision 1.17 2002/04/02 14:27:11 badbytes
|
||||
* Final finishes.
|
||||
*
|
||||
* Revision 1.16 2002/03/25 09:11:23 badbytes
|
||||
* Added a list of onions being tracked for replay attacks.
|
||||
*
|
||||
* Revision 1.15 2002/01/26 19:24:29 mp292
|
||||
* Reviewed according to Secure-Programs-HOWTO.
|
||||
*
|
||||
* Revision 1.14 2002/01/18 20:40:40 mp292
|
||||
* Fixed a bug in en/decrypt_onion() functions.
|
||||
*
|
||||
* Revision 1.13 2002/01/17 23:48:31 mp292
|
||||
* Added some extra debugging messages to fix a bug in encrypt_onion() which
|
||||
* seems to corrupt the routent *route list.
|
||||
*
|
||||
* Revision 1.12 2002/01/11 15:47:17 badbytes
|
||||
* *** empty log message ***
|
||||
*
|
||||
* Revision 1.11 2002/01/09 07:55:23 badbytes
|
||||
* Ciphers got out of sync. Hopefully fixed.
|
||||
*
|
||||
* Revision 1.10 2002/01/04 13:48:54 badbytes
|
||||
* Changed unsigned short/long to uint16_t and uint32_t respectively.
|
||||
*
|
||||
* Revision 1.9 2001/12/19 08:29:00 badbytes
|
||||
* Macro DEFAULT_CIPHER now holds the default crypto algorithm
|
||||
*
|
||||
* Revision 1.8 2001/12/18 10:37:47 badbytes
|
||||
* Header files now only apply if they were not previously included from somewhere else.
|
||||
*
|
||||
* Revision 1.7 2001/12/18 07:26:47 badbytes
|
||||
* Added a new definition of onion_layer_t, depending on the byte order.
|
||||
*
|
||||
* Revision 1.6 2001/12/17 13:35:17 badbytes
|
||||
* Still writing handle_connection()
|
||||
*
|
||||
* Revision 1.5 2001/12/14 14:44:37 badbytes
|
||||
* chooselen() tested
|
||||
*
|
||||
* Revision 1.4 2001/12/14 13:31:08 badbytes
|
||||
* peel_onion() was redundant, removed it
|
||||
*
|
||||
* Revision 1.3 2001/12/14 13:14:03 badbytes
|
||||
* Split types.h into routent.h and ss.h. Keeping them all in one file created unnecesary dependencies.
|
||||
*
|
||||
* Revision 1.2 2001/12/14 12:44:47 badbytes
|
||||
* Minor modifications to reflect new paths ...
|
||||
*
|
||||
* Revision 1.1 2001/12/14 12:41:12 badbytes
|
||||
* Moved from op/ as it will be reused by other modules.
|
||||
*
|
||||
* Revision 1.1 2001/12/13 15:15:10 badbytes
|
||||
* Started coding the onion proxy.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef __ONION_H
|
||||
|
||||
#include <endian.h>
|
||||
#include <stdint.h>
|
||||
|
||||
#include <openssl/rsa.h>
|
||||
#include <openssl/evp.h>
|
||||
|
||||
#include "routent.h"
|
||||
#include "version.h"
|
||||
|
||||
/* available cipher functions */
|
||||
#define ONION_CIPHER_IDENTITY 0
|
||||
#define ONION_CIPHER_DES 1
|
||||
#define ONION_CIPHER_RC4 2
|
||||
|
||||
/* default cipher function */
|
||||
#define ONION_DEFAULT_CIPHER ONION_CIPHER_DES
|
||||
|
||||
typedef struct
|
||||
{
|
||||
int zero:1;
|
||||
int version:7;
|
||||
int backf:4;
|
||||
int forwf:4;
|
||||
uint16_t port;
|
||||
uint32_t addr;
|
||||
time_t expire;
|
||||
unsigned char keyseed[16];
|
||||
} onion_layer_t;
|
||||
|
||||
typedef struct
|
||||
{
|
||||
unsigned int forwf;
|
||||
unsigned int backf;
|
||||
char digest2[20]; /* second SHA output for onion_layer_t.keyseed */
|
||||
char digest3[20]; /* third SHA output for onion_layer_t.keyseed */
|
||||
|
||||
/* IVs */
|
||||
char f_iv[16];
|
||||
char b_iv[16];
|
||||
|
||||
/* cipher contexts */
|
||||
EVP_CIPHER_CTX f_ctx;
|
||||
EVP_CIPHER_CTX b_ctx;
|
||||
|
||||
} crypt_path_t;
|
||||
|
||||
typedef struct
|
||||
{
|
||||
time_t expire;
|
||||
char digest[20]; /* SHA digest of the onion */
|
||||
void *prev;
|
||||
void *next;
|
||||
} tracked_onion_t;
|
||||
|
||||
/* returns an array of indexes into a router array that define a new route through the OR network
|
||||
* int cw is the coin weight to use when choosing the route
|
||||
* order of routers is from last to first */
|
||||
unsigned int *new_route(double cw, routent_t **rarray, size_t rarray_len, size_t *rlen);
|
||||
|
||||
/* creates a new onion from route, stores it and its length into bufp and lenp respectively */
|
||||
/* if cpathp not NULL then also compute the corresponding crypt_path */
|
||||
unsigned char *create_onion(routent_t **rarray, size_t rarray_len, unsigned int *route, size_t routelen, size_t *lenp, crypt_path_t **cpathp);
|
||||
|
||||
/* encrypts 128 bytes of the onion with the specified public key, the rest with
|
||||
* DES OFB with the key as defined in the outter layer */
|
||||
unsigned char *encrypt_onion(onion_layer_t *onion, uint32_t onionlen, RSA *pkey);
|
||||
|
||||
/* decrypts the onion */
|
||||
unsigned char *decrypt_onion(onion_layer_t *onion, uint32_t onionlen, RSA *prkey);
|
||||
|
||||
/* deletes the first n bytes of the onion and pads the end with n bytes of random data */
|
||||
void pad_onion(unsigned char *onion, uint32_t onionlen, size_t n);
|
||||
|
||||
/* create a new tracked_onion entry */
|
||||
tracked_onion_t *new_tracked_onion(unsigned char *onion, uint32_t onionlen, tracked_onion_t **tracked_onions, tracked_onion_t **last_tracked_onion);
|
||||
|
||||
/* delete a tracked onion entry */
|
||||
void remove_tracked_onion(tracked_onion_t *to, tracked_onion_t **tracked_onions, tracked_onion_t **last_tracked_onion);
|
||||
|
||||
/* find a tracked onion in the linked list of tracked onions */
|
||||
tracked_onion_t *id_tracked_onion(unsigned char *onion, uint32_t onionlen, tracked_onion_t *tracked_onions);
|
||||
|
||||
#define __ONION_H
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user