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postgres/contrib/pgcrypto/pgp.h
Noah Misch 0ba2004312 pgcrypto: Report errant decryption as "Wrong key or corrupt data". 
This has been the predominant outcome.  When the output of decrypting
with a wrong key coincidentally resembled an OpenPGP packet header,
pgcrypto could instead report "Corrupt data", "Not text data" or
"Unsupported compression algorithm".  The distinct "Corrupt data"
message added no value.  The latter two error messages misled when the
decrypted payload also exhibited fundamental integrity problems.  Worse,
error message variance in other systems has enabled cryptologic attacks;
see RFC 4880 section "14. Security Considerations".  Whether these
pgcrypto behaviors are likewise exploitable is unknown.

In passing, document that pgcrypto does not resist side-channel attacks.
Back-patch to 9.0 (all supported versions).

Security: CVE-2015-3167
2015-05-18 10:02:37 -04:00

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/*
* pgp.h
* OpenPGP implementation.
*
* Copyright (c) 2005 Marko Kreen
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* contrib/pgcrypto/pgp.h
*/
enum PGP_S2K_TYPE
{
PGP_S2K_SIMPLE = 0,
PGP_S2K_SALTED = 1,
PGP_S2K_ISALTED = 3
};
enum PGP_PKT_TYPE
{
PGP_PKT_RESERVED = 0,
PGP_PKT_PUBENCRYPTED_SESSKEY = 1,
PGP_PKT_SIGNATURE = 2,
PGP_PKT_SYMENCRYPTED_SESSKEY = 3,
PGP_PKT_SECRET_KEY = 5,
PGP_PKT_PUBLIC_KEY = 6,
PGP_PKT_SECRET_SUBKEY = 7,
PGP_PKT_COMPRESSED_DATA = 8,
PGP_PKT_SYMENCRYPTED_DATA = 9,
PGP_PKT_MARKER = 10,
PGP_PKT_LITERAL_DATA = 11,
PGP_PKT_TRUST = 12,
PGP_PKT_USER_ID = 13,
PGP_PKT_PUBLIC_SUBKEY = 14,
PGP_PKT_USER_ATTR = 17,
PGP_PKT_SYMENCRYPTED_DATA_MDC = 18,
PGP_PKT_MDC = 19,
PGP_PKT_PRIV_61 = 61 /* occurs in gpg secring */
};
enum PGP_PUB_ALGO_TYPE
{
PGP_PUB_RSA_ENCRYPT_SIGN = 1,
PGP_PUB_RSA_ENCRYPT = 2,
PGP_PUB_RSA_SIGN = 3,
PGP_PUB_ELG_ENCRYPT = 16,
PGP_PUB_DSA_SIGN = 17
};
enum PGP_SYMENC_TYPE
{
PGP_SYM_PLAIN = 0, /* ?? */
PGP_SYM_IDEA = 1, /* obsolete, PGP 2.6 compat */
PGP_SYM_DES3 = 2, /* must */
PGP_SYM_CAST5 = 3, /* should */
PGP_SYM_BLOWFISH = 4,
PGP_SYM_SAFER_SK128 = 5, /* obsolete */
PGP_SYM_DES_SK = 6, /* obsolete */
PGP_SYM_AES_128 = 7, /* should */
PGP_SYM_AES_192 = 8,
PGP_SYM_AES_256 = 9,
PGP_SYM_TWOFISH = 10
};
enum PGP_COMPR_TYPE
{
PGP_COMPR_NONE = 0, /* must */
PGP_COMPR_ZIP = 1, /* should */
PGP_COMPR_ZLIB = 2,
PGP_COMPR_BZIP2 = 3
};
enum PGP_DIGEST_TYPE
{
PGP_DIGEST_MD5 = 1, /* should, deprecated */
PGP_DIGEST_SHA1 = 2, /* must */
PGP_DIGEST_RIPEMD160 = 3,
PGP_DIGEST_XSHA = 4, /* obsolete */
PGP_DIGEST_MD2 = 5, /* obsolete */
PGP_DIGEST_TIGER192 = 6, /* obsolete */
PGP_DIGEST_HAVAL5_160 = 7, /* obsolete */
PGP_DIGEST_SHA256 = 8,
PGP_DIGEST_SHA384 = 9,
PGP_DIGEST_SHA512 = 10
};
#define PGP_MAX_KEY (256/8)
#define PGP_MAX_BLOCK (256/8)
#define PGP_MAX_DIGEST (512/8)
#define PGP_S2K_SALT 8
typedef struct PGP_MPI PGP_MPI;
typedef struct PGP_PubKey PGP_PubKey;
typedef struct PGP_Context PGP_Context;
typedef struct PGP_S2K PGP_S2K;
struct PGP_S2K
{
uint8 mode;
uint8 digest_algo;
uint8 salt[8];
uint8 iter;
/* calculated: */
uint8 key[PGP_MAX_KEY];
uint8 key_len;
};
struct PGP_Context
{
/*
* parameters
*/
PGP_S2K s2k;
int s2k_mode;
int s2k_digest_algo;
int s2k_cipher_algo;
int cipher_algo;
int compress_algo;
int compress_level;
int disable_mdc;
int use_sess_key;
int text_mode;
int convert_crlf;
int unicode_mode;
/*
* internal variables
*/
int mdc_checked;
int corrupt_prefix; /* prefix failed RFC 4880 "quick check" */
int unsupported_compr; /* has bzip2 compression */
int unexpected_binary; /* binary data seen in text_mode */
int in_mdc_pkt;
int use_mdcbuf_filter;
PX_MD *mdc_ctx;
PGP_PubKey *pub_key; /* ctx owns it */
const uint8 *sym_key; /* ctx does not own it */
int sym_key_len;
/*
* read or generated data
*/
uint8 sess_key[PGP_MAX_KEY];
unsigned sess_key_len;
};
struct PGP_MPI
{
uint8 *data;
int bits;
int bytes;
};
struct PGP_PubKey
{
uint8 ver;
uint8 time[4];
uint8 algo;
/* public part */
union
{
struct
{
PGP_MPI *p;
PGP_MPI *g;
PGP_MPI *y;
} elg;
struct
{
PGP_MPI *n;
PGP_MPI *e;
} rsa;
struct
{
PGP_MPI *p;
PGP_MPI *q;
PGP_MPI *g;
PGP_MPI *y;
} dsa;
} pub;
/* secret part */
union
{
struct
{
PGP_MPI *x;
} elg;
struct
{
PGP_MPI *d;
PGP_MPI *p;
PGP_MPI *q;
PGP_MPI *u;
} rsa;
struct
{
PGP_MPI *x;
} dsa;
} sec;
uint8 key_id[8];
int can_encrypt;
};
int pgp_init(PGP_Context **ctx);
int pgp_encrypt(PGP_Context *ctx, MBuf *src, MBuf *dst);
int pgp_decrypt(PGP_Context *ctx, MBuf *src, MBuf *dst);
int pgp_free(PGP_Context *ctx);
int pgp_get_digest_code(const char *name);
int pgp_get_cipher_code(const char *name);
const char *pgp_get_digest_name(int code);
const char *pgp_get_cipher_name(int code);
int pgp_set_cipher_algo(PGP_Context *ctx, const char *name);
int pgp_set_s2k_mode(PGP_Context *ctx, int type);
int pgp_set_s2k_cipher_algo(PGP_Context *ctx, const char *name);
int pgp_set_s2k_digest_algo(PGP_Context *ctx, const char *name);
int pgp_set_convert_crlf(PGP_Context *ctx, int doit);
int pgp_disable_mdc(PGP_Context *ctx, int disable);
int pgp_set_sess_key(PGP_Context *ctx, int use);
int pgp_set_compress_algo(PGP_Context *ctx, int algo);
int pgp_set_compress_level(PGP_Context *ctx, int level);
int pgp_set_text_mode(PGP_Context *ctx, int mode);
int pgp_set_unicode_mode(PGP_Context *ctx, int mode);
int pgp_get_unicode_mode(PGP_Context *ctx);
int pgp_set_symkey(PGP_Context *ctx, const uint8 *key, int klen);
int pgp_set_pubkey(PGP_Context *ctx, MBuf *keypkt,
const uint8 *key, int klen, int pubtype);
int pgp_get_keyid(MBuf *pgp_data, char *dst);
/* internal functions */
int pgp_load_digest(int c, PX_MD **res);
int pgp_load_cipher(int c, PX_Cipher **res);
int pgp_get_cipher_key_size(int c);
int pgp_get_cipher_block_size(int c);
int pgp_s2k_fill(PGP_S2K *s2k, int mode, int digest_algo);
int pgp_s2k_read(PullFilter *src, PGP_S2K *s2k);
int pgp_s2k_process(PGP_S2K *s2k, int cipher, const uint8 *key, int klen);
typedef struct PGP_CFB PGP_CFB;
int
pgp_cfb_create(PGP_CFB **ctx_p, int algo,
const uint8 *key, int key_len, int recync, uint8 *iv);
void pgp_cfb_free(PGP_CFB *ctx);
int pgp_cfb_encrypt(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst);
int pgp_cfb_decrypt(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst);
int pgp_armor_encode(const uint8 *src, unsigned len, uint8 *dst);
int pgp_armor_decode(const uint8 *src, unsigned len, uint8 *dst);
unsigned pgp_armor_enc_len(unsigned len);
unsigned pgp_armor_dec_len(unsigned len);
int pgp_compress_filter(PushFilter **res, PGP_Context *ctx, PushFilter *dst);
int pgp_decompress_filter(PullFilter **res, PGP_Context *ctx, PullFilter *src);
int pgp_key_alloc(PGP_PubKey **pk_p);
void pgp_key_free(PGP_PubKey *pk);
int _pgp_read_public_key(PullFilter *pkt, PGP_PubKey **pk_p);
int pgp_parse_pubenc_sesskey(PGP_Context *ctx, PullFilter *pkt);
int pgp_create_pkt_reader(PullFilter **pf_p, PullFilter *src, int len,
int pkttype, PGP_Context *ctx);
int pgp_parse_pkt_hdr(PullFilter *src, uint8 *tag, int *len_p,
int allow_ctx);
int pgp_skip_packet(PullFilter *pkt);
int pgp_expect_packet_end(PullFilter *pkt);
int pgp_write_pubenc_sesskey(PGP_Context *ctx, PushFilter *dst);
int pgp_create_pkt_writer(PushFilter *dst, int tag, PushFilter **res_p);
int pgp_mpi_alloc(int bits, PGP_MPI **mpi);
int pgp_mpi_create(uint8 *data, int bits, PGP_MPI **mpi);
int pgp_mpi_free(PGP_MPI *mpi);
int pgp_mpi_read(PullFilter *src, PGP_MPI **mpi);
int pgp_mpi_write(PushFilter *dst, PGP_MPI *n);
int pgp_mpi_hash(PX_MD *md, PGP_MPI *n);
unsigned pgp_mpi_cksum(unsigned cksum, PGP_MPI *n);
int pgp_elgamal_encrypt(PGP_PubKey *pk, PGP_MPI *m,
PGP_MPI **c1, PGP_MPI **c2);
int pgp_elgamal_decrypt(PGP_PubKey *pk, PGP_MPI *c1, PGP_MPI *c2,
PGP_MPI **m);
int pgp_rsa_encrypt(PGP_PubKey *pk, PGP_MPI *m, PGP_MPI **c);
int pgp_rsa_decrypt(PGP_PubKey *pk, PGP_MPI *c, PGP_MPI **m);
extern struct PullFilterOps pgp_decrypt_filter;
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