diff options
Diffstat (limited to 'packet.c')
| -rw-r--r-- | packet.c | 106 |
1 files changed, 94 insertions, 12 deletions
@@ -115,6 +115,8 @@ static int interactive_mode = 0; /* Session key information for Encryption and MAC */ Newkeys *newkeys[MODE_MAX]; +static u_int32_t read_seqnr = 0; +static u_int32_t send_seqnr = 0; /* roundup current message to extra_pad bytes */ static u_char extra_pad = 0; @@ -171,6 +173,87 @@ packet_connection_is_on_socket(void) return 1; } +/* + * Exports an IV from the CipherContext required to export the key + * state back from the unprivileged child to the privileged parent + * process. + */ + +void +packet_get_keyiv(int mode, u_char *iv, u_int len) +{ + CipherContext *cc; + + if (mode == MODE_OUT) + cc = &send_context; + else + cc = &receive_context; + + cipher_get_keyiv(cc, iv, len); +} + +int +packet_get_keycontext(int mode, u_char *dat) +{ + int plen; + CipherContext *cc; + + if (mode == MODE_OUT) + cc = &send_context; + else + cc = &receive_context; + +#if OPENSSL_VERSION_NUMBER < 0x00907000L + plen = sizeof(cc->evp.c); +#else + plen = cc->evp.cipher->ctx_size; +#endif + + if (dat == NULL) + return (plen); + +#if OPENSSL_VERSION_NUMBER < 0x00907000L + memcpy(dat, &cc->evp.c, sizeof(cc->evp.c)); +#else + memcpy(dat, &cc->evp.cipher_data, plen); +#endif + return (plen); +} + +void +packet_set_keycontext(int mode, u_char *dat) +{ + CipherContext *cc; + + if (mode == MODE_OUT) + cc = &send_context; + else + cc = &receive_context; + +#if OPENSSL_VERSION_NUMBER < 0x00907000L + memcpy(&cc->evp.c, dat, sizeof(cc->evp.c)); +#else + memcpy(&cc->evp.cipher_data, dat, cc->evp.cipher->ctx_size); +#endif +} + +u_int32_t +packet_get_seqnr(int mode) +{ + return (mode == MODE_IN ? read_seqnr : send_seqnr); +} + +void +packet_set_seqnr(int mode, u_int32_t seqnr) +{ + if (mode == MODE_IN) + read_seqnr = seqnr; + else if (mode == MODE_OUT) + send_seqnr = seqnr; + else + fatal("%s: bad mode %d", __FUNCTION__, mode); +} + /* returns 1 if connection is via ipv4 */ int @@ -433,7 +516,7 @@ packet_send1(void) */ } -static void +void set_newkeys(int mode) { Enc *enc; @@ -477,8 +560,9 @@ set_newkeys(int mode) DBG(debug("cipher_init_context: %d", mode)); cipher_init(cc, enc->cipher, enc->key, enc->key_len, enc->iv, enc->block_size, encrypt); - memset(enc->iv, 0, enc->block_size); - memset(enc->key, 0, enc->key_len); + /* Deleting the keys does not gain extra security */ + /* memset(enc->iv, 0, enc->block_size); + memset(enc->key, 0, enc->key_len); */ if (comp->type != 0 && comp->enabled == 0) { packet_init_compression(); if (mode == MODE_OUT) @@ -495,7 +579,6 @@ set_newkeys(int mode) static void packet_send2(void) { - static u_int32_t seqnr = 0; u_char type, *cp, *macbuf = NULL; u_char padlen, pad; u_int packet_length = 0; @@ -576,10 +659,10 @@ packet_send2(void) /* compute MAC over seqnr and packet(length fields, payload, padding) */ if (mac && mac->enabled) { - macbuf = mac_compute(mac, seqnr, + macbuf = mac_compute(mac, send_seqnr, buffer_ptr(&outgoing_packet), buffer_len(&outgoing_packet)); - DBG(debug("done calc MAC out #%d", seqnr)); + DBG(debug("done calc MAC out #%d", send_seqnr)); } /* encrypt packet and append to output buffer. */ cp = buffer_append_space(&output, buffer_len(&outgoing_packet)); @@ -593,7 +676,7 @@ packet_send2(void) buffer_dump(&output); #endif /* increment sequence number for outgoing packets */ - if (++seqnr == 0) + if (++send_seqnr == 0) log("outgoing seqnr wraps around"); buffer_clear(&outgoing_packet); @@ -783,7 +866,6 @@ packet_read_poll1(void) static int packet_read_poll2(u_int32_t *seqnr_p) { - static u_int32_t seqnr = 0; static u_int packet_length = 0; u_int padlen, need; u_char *macbuf, *cp, type; @@ -845,17 +927,17 @@ packet_read_poll2(u_int32_t *seqnr_p) * increment sequence number for incoming packet */ if (mac && mac->enabled) { - macbuf = mac_compute(mac, seqnr, + macbuf = mac_compute(mac, read_seqnr, buffer_ptr(&incoming_packet), buffer_len(&incoming_packet)); if (memcmp(macbuf, buffer_ptr(&input), mac->mac_len) != 0) packet_disconnect("Corrupted MAC on input."); - DBG(debug("MAC #%d ok", seqnr)); + DBG(debug("MAC #%d ok", read_seqnr)); buffer_consume(&input, mac->mac_len); } if (seqnr_p != NULL) - *seqnr_p = seqnr; - if (++seqnr == 0) + *seqnr_p = read_seqnr; + if (++read_seqnr == 0) log("incoming seqnr wraps around"); /* get padlen */ |