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The basic rule we follow here is to always first include 'postgres.h' or 'postgres_fe.h' whichever is applicable, then system header includes and then Postgres header includes. In this, we also follow that all the Postgres header includes are in order based on their ASCII value. We generally follow these rules, but the code has deviated in many places. This commit makes it consistent just for contrib modules. The later commits will enforce similar rules in other parts of code. Author: Vignesh C Reviewed-by: Amit Kapila Discussion: https://postgr.es/m/CALDaNm2Sznv8RR6Ex-iJO6xAdsxgWhCoETkaYX=+9DW3q0QCfA@mail.gmail.com
236 lines
4.8 KiB
C
236 lines
4.8 KiB
C
/*
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* pgp-pubdec.c
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* Decrypt public-key encrypted session key.
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*
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* Copyright (c) 2005 Marko Kreen
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* contrib/pgcrypto/pgp-pubdec.c
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*/
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#include "postgres.h"
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#include "pgp.h"
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#include "px.h"
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/*
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* padded msg = 02 || PS || 00 || M
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* PS - pad bytes
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* M - msg
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*/
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static uint8 *
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check_eme_pkcs1_v15(uint8 *data, int len)
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{
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uint8 *data_end = data + len;
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uint8 *p = data;
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int rnd = 0;
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if (len < 1 + 8 + 1)
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return NULL;
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if (*p++ != 2)
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return NULL;
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while (p < data_end && *p)
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{
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p++;
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rnd++;
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}
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if (p == data_end)
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return NULL;
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if (*p != 0)
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return NULL;
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if (rnd < 8)
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return NULL;
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return p + 1;
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}
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/*
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* secret message: 1 byte algo, sesskey, 2 byte cksum
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* ignore algo in cksum
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*/
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static int
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control_cksum(uint8 *msg, int msglen)
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{
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int i;
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unsigned my_cksum,
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got_cksum;
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if (msglen < 3)
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return PXE_PGP_WRONG_KEY;
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my_cksum = 0;
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for (i = 1; i < msglen - 2; i++)
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my_cksum += msg[i];
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my_cksum &= 0xFFFF;
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got_cksum = ((unsigned) (msg[msglen - 2]) << 8) + msg[msglen - 1];
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if (my_cksum != got_cksum)
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{
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px_debug("pubenc cksum failed");
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return PXE_PGP_WRONG_KEY;
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}
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return 0;
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}
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static int
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decrypt_elgamal(PGP_PubKey *pk, PullFilter *pkt, PGP_MPI **m_p)
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{
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int res;
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PGP_MPI *c1 = NULL;
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PGP_MPI *c2 = NULL;
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if (pk->algo != PGP_PUB_ELG_ENCRYPT)
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return PXE_PGP_WRONG_KEY;
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/* read elgamal encrypted data */
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res = pgp_mpi_read(pkt, &c1);
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if (res < 0)
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goto out;
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res = pgp_mpi_read(pkt, &c2);
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if (res < 0)
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goto out;
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/* decrypt */
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res = pgp_elgamal_decrypt(pk, c1, c2, m_p);
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out:
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pgp_mpi_free(c1);
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pgp_mpi_free(c2);
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return res;
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}
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static int
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decrypt_rsa(PGP_PubKey *pk, PullFilter *pkt, PGP_MPI **m_p)
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{
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int res;
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PGP_MPI *c;
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if (pk->algo != PGP_PUB_RSA_ENCRYPT
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&& pk->algo != PGP_PUB_RSA_ENCRYPT_SIGN)
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return PXE_PGP_WRONG_KEY;
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/* read rsa encrypted data */
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res = pgp_mpi_read(pkt, &c);
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if (res < 0)
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return res;
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/* decrypt */
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res = pgp_rsa_decrypt(pk, c, m_p);
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pgp_mpi_free(c);
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return res;
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}
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/* key id is missing - user is expected to try all keys */
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static const uint8
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any_key[] = {0, 0, 0, 0, 0, 0, 0, 0};
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int
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pgp_parse_pubenc_sesskey(PGP_Context *ctx, PullFilter *pkt)
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{
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int ver;
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int algo;
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int res;
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uint8 key_id[8];
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PGP_PubKey *pk;
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uint8 *msg;
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int msglen;
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PGP_MPI *m;
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pk = ctx->pub_key;
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if (pk == NULL)
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{
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px_debug("no pubkey?");
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return PXE_BUG;
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}
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GETBYTE(pkt, ver);
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if (ver != 3)
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{
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px_debug("unknown pubenc_sesskey pkt ver=%d", ver);
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return PXE_PGP_CORRUPT_DATA;
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}
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/*
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* check if keyid's match - user-friendly msg
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*/
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res = pullf_read_fixed(pkt, 8, key_id);
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if (res < 0)
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return res;
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if (memcmp(key_id, any_key, 8) != 0
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&& memcmp(key_id, pk->key_id, 8) != 0)
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{
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px_debug("key_id's does not match");
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return PXE_PGP_WRONG_KEY;
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}
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/*
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* Decrypt
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*/
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GETBYTE(pkt, algo);
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switch (algo)
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{
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case PGP_PUB_ELG_ENCRYPT:
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res = decrypt_elgamal(pk, pkt, &m);
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break;
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case PGP_PUB_RSA_ENCRYPT:
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case PGP_PUB_RSA_ENCRYPT_SIGN:
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res = decrypt_rsa(pk, pkt, &m);
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break;
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default:
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res = PXE_PGP_UNKNOWN_PUBALGO;
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}
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if (res < 0)
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return res;
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/*
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* extract message
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*/
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msg = check_eme_pkcs1_v15(m->data, m->bytes);
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if (msg == NULL)
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{
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px_debug("check_eme_pkcs1_v15 failed");
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res = PXE_PGP_WRONG_KEY;
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goto out;
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}
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msglen = m->bytes - (msg - m->data);
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res = control_cksum(msg, msglen);
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if (res < 0)
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goto out;
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/*
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* got sesskey
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*/
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ctx->cipher_algo = *msg;
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ctx->sess_key_len = msglen - 3;
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memcpy(ctx->sess_key, msg + 1, ctx->sess_key_len);
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out:
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pgp_mpi_free(m);
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if (res < 0)
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return res;
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return pgp_expect_packet_end(pkt);
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}
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