From b0dd705a264f0f72a7afba6de85200598cbe083b Mon Sep 17 00:00:00 2001 From: Guus Sliepen Date: Fri, 10 Oct 2003 16:24:24 +0000 Subject: [PATCH] Check return value of EVP_* functions, and check if length before en/decryption matches that after in meta.c. --- src/meta.c | 20 ++++++++++++++------ src/net_packet.c | 41 +++++++++++++++++++++++++++-------------- 2 files changed, 41 insertions(+), 20 deletions(-) diff --git a/src/meta.c b/src/meta.c index dacb1df9..5048e63b 100644 --- a/src/meta.c +++ b/src/meta.c @@ -17,7 +17,7 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: meta.c,v 1.1.2.44 2003/08/28 21:05:10 guus Exp $ + $Id: meta.c,v 1.1.2.45 2003/10/10 16:24:24 guus Exp $ */ #include "system.h" @@ -46,7 +46,11 @@ bool send_meta(connection_t *c, const char *buffer, int length) c->name, c->hostname); if(c->status.encryptout) { - EVP_EncryptUpdate(c->outctx, outbuf, &outlen, buffer, length); + result = EVP_EncryptUpdate(c->outctx, outbuf, &outlen, buffer, length); + if(!result || outlen != length) { + logger(LOG_ERR, _("Error while encrypting metadata to %s (%s): %s"), ERR_error_string(ERR_get_error(), NULL)); + return false; + } bufp = outbuf; length = outlen; } else @@ -89,8 +93,8 @@ void broadcast_meta(connection_t *from, const char *buffer, int length) bool receive_meta(connection_t *c) { - int oldlen, i; - int lenin, reqlen; + int oldlen, i, result; + int lenin, lenout, reqlen; bool decrypted = false; char inbuf[MAXBUFSIZE]; @@ -123,11 +127,15 @@ bool receive_meta(connection_t *c) oldlen = c->buflen; c->buflen += lenin; - while(lenin) { + while(lenin > 0) { /* Decrypt */ if(c->status.decryptin && !decrypted) { - EVP_DecryptUpdate(c->inctx, inbuf, &lenin, c->buffer + oldlen, lenin); + result = EVP_DecryptUpdate(c->inctx, inbuf, &lenout, c->buffer + oldlen, lenin); + if(!result || lenout != lenin) { + logger(LOG_ERR, _("Error while decrypting metadata from %s (%s): %s"), ERR_error_string(ERR_get_error(), NULL)); + return false; + } memcpy(c->buffer + oldlen, inbuf, lenin); decrypted = true; } diff --git a/src/net_packet.c b/src/net_packet.c index a989b09f..00e36fc5 100644 --- a/src/net_packet.c +++ b/src/net_packet.c @@ -17,7 +17,7 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: net_packet.c,v 1.1.2.41 2003/09/23 20:59:01 guus Exp $ + $Id: net_packet.c,v 1.1.2.42 2003/10/10 16:24:24 guus Exp $ */ #include "system.h" @@ -114,7 +114,7 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) vpn_packet_t *outpkt = pkt[0]; int outlen, outpad; char hmac[EVP_MAX_MD_SIZE]; - int i; + int i, result; cp(); @@ -145,12 +145,18 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) if(myself->cipher) { outpkt = pkt[nextpkt++]; -// EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, myself->key, -// myself->key + myself->cipher->key_len); EVP_DecryptInit_ex(&packet_ctx, NULL, NULL, NULL, NULL); - EVP_DecryptUpdate(&packet_ctx, (char *) &outpkt->seqno, &outlen, - (char *) &inpkt->seqno, inpkt->len); - EVP_DecryptFinal_ex(&packet_ctx, (char *) &outpkt->seqno + outlen, &outpad); + if(!EVP_DecryptUpdate(&packet_ctx, (char *) &outpkt->seqno, &outlen, + (char *) &inpkt->seqno, inpkt->len)) { + ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Error decrypting packet from %s (%s): %s"), + n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL)); + return; + } + if(!EVP_DecryptFinal_ex(&packet_ctx, (char *) &outpkt->seqno + outlen, &outpad)) { + ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Error decrypting packet from %s (%s): %s"), + n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL)); + return; + } outpkt->len = outlen + outpad; inpkt = outpkt; @@ -189,8 +195,8 @@ static void receive_udppacket(node_t *n, vpn_packet_t *inpkt) outpkt = pkt[nextpkt++]; if((outpkt->len = uncompress_packet(outpkt->data, inpkt->data, inpkt->len, myself->compression)) < 0) { - logger(LOG_ERR, _("Error while uncompressing packet from %s (%s)"), - n->name, n->hostname); + ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while uncompressing packet from %s (%s)"), + n->name, n->hostname); return; } @@ -264,7 +270,7 @@ static void send_udppacket(node_t *n, vpn_packet_t *inpkt) outpkt = pkt[nextpkt++]; if((outpkt->len = compress_packet(outpkt->data, inpkt->data, inpkt->len, n->compression)) < 0) { - logger(LOG_ERR, _("Error while compressing packet to %s (%s)"), + ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while compressing packet to %s (%s)"), n->name, n->hostname); return; } @@ -282,11 +288,18 @@ static void send_udppacket(node_t *n, vpn_packet_t *inpkt) if(n->cipher) { outpkt = pkt[nextpkt++]; -// EVP_EncryptInit_ex(&packet_ctx, n->cipher, NULL, n->key, n->key + n->cipher->key_len); EVP_EncryptInit_ex(&n->packet_ctx, NULL, NULL, NULL, NULL); - EVP_EncryptUpdate(&n->packet_ctx, (char *) &outpkt->seqno, &outlen, - (char *) &inpkt->seqno, inpkt->len); - EVP_EncryptFinal_ex(&n->packet_ctx, (char *) &outpkt->seqno + outlen, &outpad); + if(!EVP_EncryptUpdate(&n->packet_ctx, (char *) &outpkt->seqno, &outlen, + (char *) &inpkt->seqno, inpkt->len)) { + ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while encrypting packet to %s (%s): %s"), + n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL)); + return; + } + if(!EVP_EncryptFinal_ex(&n->packet_ctx, (char *) &outpkt->seqno + outlen, &outpad)) { + ifdebug(TRAFFIC) logger(LOG_ERR, _("Error while encrypting packet to %s (%s): %s"), + n->name, n->hostname, ERR_error_string(ERR_get_error(), NULL)); + return; + } outpkt->len = outlen + outpad; inpkt = outpkt; -- 2.20.1