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kex.c: group16-sha512 and group18-sha512 support #457 (#468)

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Files: kex.c

Notes:
Added key exchange group16-sha512 and group18-sha512. As a result did the following:

Abstracted diffie_hellman_sha256() to diffie_hellman_sha_algo() which is now algorithm agnostic and takes the algorithm as a parameter since we needed sha512 support. Unfortunately it required some helper functions but they are simple.
Deleted diffie_hellman_sha1()
Deleted diffie_hellman_sha1 specific macro
Cleaned up some formatting
Defined sha384 in os400 and wincng backends
Defined LIBSSH2_DH_MAX_MODULUS_BITS to abort the connection if we receive too large of p from the server doing sha1 key exchange.
Reorder the default key exchange list to match OpenSSH and improve security

Credit:
Will Cosgrove
This commit is contained in:
Will Cosgrove
2020-09-23 13:20:00 -07:00
committed by GitHub
parent 9ae9ff30cb
commit f553dcc95d
5 changed files with 575 additions and 862 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
include/libssh2.h
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@@ -239,6 +239,8 @@ typedef off_t libssh2_struct_stat_size;
#define LIBSSH2_DH_GEX_OPTGROUP 4096
#define LIBSSH2_DH_GEX_MAXGROUP 8192
#define LIBSSH2_DH_MAX_MODULUS_BITS 16384
/* Defaults for pty requests */
#define LIBSSH2_TERM_WIDTH 80
#define LIBSSH2_TERM_HEIGHT 24

1245
src/kex.c
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File diff suppressed because it is too large Load Diff

10
src/os400qc3.h
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@@ -182,6 +182,7 @@
#define MD5_DIGEST_LENGTH 16
#define SHA_DIGEST_LENGTH 20
#define SHA256_DIGEST_LENGTH 32
#define SHA384_DIGEST_LENGTH 48
#define SHA512_DIGEST_LENGTH 64
#define EC_MAX_POINT_LEN ((528 * 2 / 8) + 1)
@@ -233,6 +234,7 @@ typedef struct { /* Diffie-Hellman context. */
#define libssh2_sha1_ctx Qc3_Format_ALGD0100_T
#define libssh2_sha256_ctx Qc3_Format_ALGD0100_T
#define libssh2_sha384_ctx Qc3_Format_ALGD0100_T
#define libssh2_sha512_ctx Qc3_Format_ALGD0100_T
#define libssh2_md5_ctx Qc3_Format_ALGD0100_T
#define libssh2_hmac_ctx _libssh2_os400qc3_crypto_ctx
@@ -251,6 +253,14 @@ typedef struct { /* Diffie-Hellman context. */
#define libssh2_sha256(message, len, out) \
libssh2_os400qc3_hash(message, len, out, \
Qc3_SHA256)
#define libssh2_sha384_init(x) libssh2_os400qc3_hash_init(x, Qc3_SHA384)
#define libssh2_sha384_update(ctx, data, len) \
libssh2_os400qc3_hash_update(&(ctx), data, len)
#define libssh2_sha384_final(ctx, out) \
libssh2_os400qc3_hash_final(&(ctx), out)
#define libssh2_sha384(message, len, out) \
libssh2_os400qc3_hash(message, len, out, \
Qc3_SHA384)
#define libssh2_sha512_init(x) libssh2_os400qc3_hash_init(x, Qc3_SHA512)
#define libssh2_sha512_update(ctx, data, len) \
libssh2_os400qc3_hash_update(&(ctx), data, len)

19
src/wincng.c
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@@ -99,6 +99,10 @@
#define BCRYPT_SHA256_ALGORITHM L"SHA256"
#endif
#ifndef BCRYPT_SHA384_ALGORITHM
#define BCRYPT_SHA384_ALGORITHM L"SHA384"
#endif
#ifndef BCRYPT_SHA512_ALGORITHM
#define BCRYPT_SHA512_ALGORITHM L"SHA512"
#endif
@@ -248,6 +252,11 @@ _libssh2_wincng_init(void)
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgHashSHA256 = NULL;
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHashSHA384,
BCRYPT_SHA384_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgHashSHA384 = NULL;
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHashSHA512,
BCRYPT_SHA512_ALGORITHM, NULL, 0);
if(!BCRYPT_SUCCESS(ret)) {
@@ -272,6 +281,12 @@ _libssh2_wincng_init(void)
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgHmacSHA256 = NULL;
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHmacSHA384,
BCRYPT_SHA384_ALGORITHM, NULL,
BCRYPT_ALG_HANDLE_HMAC_FLAG);
if(!BCRYPT_SUCCESS(ret)) {
_libssh2_wincng.hAlgHmacSHA384 = NULL;
}
ret = BCryptOpenAlgorithmProvider(&_libssh2_wincng.hAlgHmacSHA512,
BCRYPT_SHA512_ALGORITHM, NULL,
BCRYPT_ALG_HANDLE_HMAC_FLAG);
@@ -369,6 +384,8 @@ _libssh2_wincng_free(void)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashSHA1, 0);
if(_libssh2_wincng.hAlgHashSHA256)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashSHA256, 0);
if(_libssh2_wincng.hAlgHashSHA384)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashSHA384, 0);
if(_libssh2_wincng.hAlgHashSHA512)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHashSHA512, 0);
if(_libssh2_wincng.hAlgHmacMD5)
@@ -377,6 +394,8 @@ _libssh2_wincng_free(void)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacSHA1, 0);
if(_libssh2_wincng.hAlgHmacSHA256)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacSHA256, 0);
if(_libssh2_wincng.hAlgHmacSHA384)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacSHA384, 0);
if(_libssh2_wincng.hAlgHmacSHA512)
(void)BCryptCloseAlgorithmProvider(_libssh2_wincng.hAlgHmacSHA512, 0);
if(_libssh2_wincng.hAlgRSA)

15
src/wincng.h
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@@ -70,6 +70,7 @@
#define MD5_DIGEST_LENGTH 16
#define SHA_DIGEST_LENGTH 20
#define SHA256_DIGEST_LENGTH 32
#define SHA384_DIGEST_LENGTH 48
#define SHA512_DIGEST_LENGTH 64
#define EC_MAX_POINT_LEN ((528 * 2 / 8) + 1)
@@ -89,10 +90,12 @@ struct _libssh2_wincng_ctx {
BCRYPT_ALG_HANDLE hAlgHashMD5;
BCRYPT_ALG_HANDLE hAlgHashSHA1;
BCRYPT_ALG_HANDLE hAlgHashSHA256;
BCRYPT_ALG_HANDLE hAlgHashSHA384;
BCRYPT_ALG_HANDLE hAlgHashSHA512;
BCRYPT_ALG_HANDLE hAlgHmacMD5;
BCRYPT_ALG_HANDLE hAlgHmacSHA1;
BCRYPT_ALG_HANDLE hAlgHmacSHA256;
BCRYPT_ALG_HANDLE hAlgHmacSHA384;
BCRYPT_ALG_HANDLE hAlgHmacSHA512;
BCRYPT_ALG_HANDLE hAlgRSA;
BCRYPT_ALG_HANDLE hAlgDSA;
@@ -165,7 +168,17 @@ typedef struct __libssh2_wincng_hash_ctx {
#define libssh2_sha256(data, datalen, hash) \
_libssh2_wincng_hash(data, datalen, _libssh2_wincng.hAlgHashSHA256, \
hash, SHA256_DIGEST_LENGTH)
#define libssh2_sha384_ctx _libssh2_wincng_hash_ctx
#define libssh2_sha384_init(ctx) \
(_libssh2_wincng_hash_init(ctx, _libssh2_wincng.hAlgHashSHA384, \
SHA384_DIGEST_LENGTH, NULL, 0) == 0)
#define libssh2_sha384_update(ctx, data, datalen) \
_libssh2_wincng_hash_update(&ctx, (unsigned char *) data, datalen)
#define libssh2_sha384_final(ctx, hash) \
_libssh2_wincng_hash_final(&ctx, hash)
#define libssh2_sha384(data, datalen, hash) \
_libssh2_wincng_hash(data, datalen, _libssh2_wincng.hAlgHashSHA384, \
hash, SHA384_DIGEST_LENGTH)
#define libssh2_sha512_ctx _libssh2_wincng_hash_ctx
#define libssh2_sha512_init(ctx) \
(_libssh2_wincng_hash_init(ctx, _libssh2_wincng.hAlgHashSHA512, \