diff options
| -rw-r--r-- | common-algo.c | 22 | ||||
| -rw-r--r-- | dh_groups.c | 46 | ||||
| -rw-r--r-- | dh_groups.h | 10 | ||||
| -rw-r--r-- | options.h | 10 | ||||
| -rw-r--r-- | sysoptions.h | 9 |
5 files changed, 37 insertions, 60 deletions
diff --git a/common-algo.c b/common-algo.c index 1841d67..c2cef77 100644 --- a/common-algo.c +++ b/common-algo.c @@ -248,14 +248,17 @@ algo_type sshhostkey[] = { {NULL, 0, NULL, 0, NULL} }; +#if DROPBEAR_DH_GROUP1 static const struct dropbear_kex kex_dh_group1 = {DROPBEAR_KEX_NORMAL_DH, dh_p_1, DH_P_1_LEN, NULL, &sha1_desc }; +#endif +#if DROPBEAR_DH_GROUP14 static const struct dropbear_kex kex_dh_group14_sha1 = {DROPBEAR_KEX_NORMAL_DH, dh_p_14, DH_P_14_LEN, NULL, &sha1_desc }; +#if DROPBEAR_DH_GROUP14_256 static const struct dropbear_kex kex_dh_group14_sha256 = {DROPBEAR_KEX_NORMAL_DH, dh_p_14, DH_P_14_LEN, NULL, &sha256_desc }; -#ifdef DROPBEAR_DH_GROUP15 -static const struct dropbear_kex kex_dh_group15_sha256 = {DROPBEAR_KEX_NORMAL_DH, dh_p_15, DH_P_15_LEN, NULL, &sha256_desc }; #endif -#ifdef DROPBEAR_DH_GROUP16 -static const struct dropbear_kex kex_dh_group16_sha256 = {DROPBEAR_KEX_NORMAL_DH, dh_p_16, DH_P_16_LEN, NULL, &sha256_desc }; +#endif +#if DROPBEAR_DH_GROUP16 +static const struct dropbear_kex kex_dh_group16_sha512 = {DROPBEAR_KEX_NORMAL_DH, dh_p_16, DH_P_16_LEN, NULL, &sha512_desc }; #endif /* These can't be const since dropbear_ecc_fill_dp() fills out @@ -292,14 +295,17 @@ algo_type sshkex[] = { {"ecdh-sha2-nistp256", 0, &kex_ecdh_nistp256, 1, NULL}, #endif #endif +#if DROPBEAR_DH_GROUP14 +#if DROPBEAR_DH_GROUP14_256 {"diffie-hellman-group14-sha256", 0, &kex_dh_group14_sha256, 1, NULL}, +#endif {"diffie-hellman-group14-sha1", 0, &kex_dh_group14_sha1, 1, NULL}, +#endif +#if DROPBEAR_DH_GROUP1 {"diffie-hellman-group1-sha1", 0, &kex_dh_group1, 1, NULL}, -#ifdef DROPBEAR_DH_GROUP15 - {"diffie-hellman-group15-sha256", 0, &kex_dh_group15_sha256, 1, NULL}, #endif -#ifdef DROPBEAR_DH_GROUP16 - {"diffie-hellman-group16-sha256", 0, &kex_dh_group16_sha256, 1, NULL}, +#if DROPBEAR_DH_GROUP16 + {"diffie-hellman-group16-sha512", 0, &kex_dh_group16_sha512, 1, NULL}, #endif #ifdef USE_KEXGUESS2 {KEXGUESS2_ALGO_NAME, KEXGUESS2_ALGO_ID, NULL, 1, NULL}, diff --git a/dh_groups.c b/dh_groups.c index 205dea3..44ee830 100644 --- a/dh_groups.c +++ b/dh_groups.c @@ -1,6 +1,7 @@ #include "options.h" #include "dh_groups.h" +#if DROPBEAR_DH_GROUP1 /* diffie-hellman-group1-sha1 value for p */ const unsigned char dh_p_1[DH_P_1_LEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2, @@ -14,7 +15,9 @@ const unsigned char dh_p_1[DH_P_1_LEN] = { 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11, 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE6, 0x53, 0x81, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; +#endif /* DROPBEAR_DH_GROUP1 */ +#if DROPBEAR_DH_GROUP14 /* diffie-hellman-group14-sha1 value for p */ const unsigned char dh_p_14[DH_P_14_LEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2, @@ -39,46 +42,9 @@ const unsigned char dh_p_14[DH_P_14_LEN] = { 0xEA, 0x95, 0x6A, 0xE5, 0x15, 0xD2, 0x26, 0x18, 0x98, 0xFA, 0x05, 0x10, 0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAC, 0xAA, 0x68, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; +#endif /* DROPBEAR_DH_GROUP14 */ -#ifdef DROPBEAR_DH_GROUP15 -/* diffie-hellman-group15-sha256 value for p */ -const unsigned char dh_p_15[DH_P_15_LEN] = { - 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2, - 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1, - 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6, - 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD, - 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D, - 0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45, - 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9, - 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED, - 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11, - 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE4, 0x5B, 0x3D, - 0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63, 0xBF, 0x05, 0x98, 0xDA, 0x48, 0x36, - 0x1C, 0x55, 0xD3, 0x9A, 0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF, 0x5F, - 0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96, 0x1C, 0x62, 0xF3, 0x56, - 0x20, 0x85, 0x52, 0xBB, 0x9E, 0xD5, 0x29, 0x07, 0x70, 0x96, 0x96, 0x6D, - 0x67, 0x0C, 0x35, 0x4E, 0x4A, 0xBC, 0x98, 0x04, 0xF1, 0x74, 0x6C, 0x08, - 0xCA, 0x18, 0x21, 0x7C, 0x32, 0x90, 0x5E, 0x46, 0x2E, 0x36, 0xCE, 0x3B, - 0xE3, 0x9E, 0x77, 0x2C, 0x18, 0x0E, 0x86, 0x03, 0x9B, 0x27, 0x83, 0xA2, - 0xEC, 0x07, 0xA2, 0x8F, 0xB5, 0xC5, 0x5D, 0xF0, 0x6F, 0x4C, 0x52, 0xC9, - 0xDE, 0x2B, 0xCB, 0xF6, 0x95, 0x58, 0x17, 0x18, 0x39, 0x95, 0x49, 0x7C, - 0xEA, 0x95, 0x6A, 0xE5, 0x15, 0xD2, 0x26, 0x18, 0x98, 0xFA, 0x05, 0x10, - 0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAA, 0xC4, 0x2D, 0xAD, 0x33, 0x17, 0x0D, - 0x04, 0x50, 0x7A, 0x33, 0xA8, 0x55, 0x21, 0xAB, 0xDF, 0x1C, 0xBA, 0x64, - 0xEC, 0xFB, 0x85, 0x04, 0x58, 0xDB, 0xEF, 0x0A, 0x8A, 0xEA, 0x71, 0x57, - 0x5D, 0x06, 0x0C, 0x7D, 0xB3, 0x97, 0x0F, 0x85, 0xA6, 0xE1, 0xE4, 0xC7, - 0xAB, 0xF5, 0xAE, 0x8C, 0xDB, 0x09, 0x33, 0xD7, 0x1E, 0x8C, 0x94, 0xE0, - 0x4A, 0x25, 0x61, 0x9D, 0xCE, 0xE3, 0xD2, 0x26, 0x1A, 0xD2, 0xEE, 0x6B, - 0xF1, 0x2F, 0xFA, 0x06, 0xD9, 0x8A, 0x08, 0x64, 0xD8, 0x76, 0x02, 0x73, - 0x3E, 0xC8, 0x6A, 0x64, 0x52, 0x1F, 0x2B, 0x18, 0x17, 0x7B, 0x20, 0x0C, - 0xBB, 0xE1, 0x17, 0x57, 0x7A, 0x61, 0x5D, 0x6C, 0x77, 0x09, 0x88, 0xC0, - 0xBA, 0xD9, 0x46, 0xE2, 0x08, 0xE2, 0x4F, 0xA0, 0x74, 0xE5, 0xAB, 0x31, - 0x43, 0xDB, 0x5B, 0xFC, 0xE0, 0xFD, 0x10, 0x8E, 0x4B, 0x82, 0xD1, 0x20, - 0xA9, 0x3A, 0xD2, 0xCA, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; -#endif /* DROPBEAR_DH_GROUP15 */ - - -#ifdef DROPBEAR_DH_GROUP16 +#if DROPBEAR_DH_GROUP16 /* diffie-hellman-group16-256 value for p */ const unsigned char dh_p_16[DH_P_16_LEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2, 0x21, @@ -123,6 +89,6 @@ const unsigned char dh_p_16[DH_P_16_LEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; #endif /* DROPBEAR_DH_GROUP16 */ -/* Same for group1 and group14 */ +/* Same for all groups */ const int DH_G_VAL = 2; diff --git a/dh_groups.h b/dh_groups.h index 7fadac2..cddaa17 100644 --- a/dh_groups.h +++ b/dh_groups.h @@ -2,17 +2,17 @@ #define DROPBEAR_DH_GROUPS_H #include "options.h" +#if DROPBEAR_DH_GROUP1 #define DH_P_1_LEN 128 extern const unsigned char dh_p_1[DH_P_1_LEN]; +#endif + +#if DROPBEAR_DH_GROUP14 #define DH_P_14_LEN 256 extern const unsigned char dh_p_14[DH_P_14_LEN]; - -#ifdef DROPBEAR_DH_GROUP15 -#define DH_P_15_LEN 384 -extern const unsigned char dh_p_15[DH_P_15_LEN]; #endif -#ifdef DROPBEAR_DH_GROUP16 +#if DROPBEAR_DH_GROUP16 #define DH_P_16_LEN 512 extern const unsigned char dh_p_16[DH_P_16_LEN]; #endif @@ -152,11 +152,6 @@ If you test it please contact the Dropbear author */ * on x86-64 */ #define DROPBEAR_ECDSA -/* These larger DH groups (3072 and 4096 bit respectively) add to binary size - and may be significantly slower. Usually ECDH or curve25519 will be a better option */ -/*#define DROPBEAR_DH_GROUP15*/ -/*#define DROPBEAR_DH_GROUP16*/ - /* Generate hostkeys as-needed when the first connection using that key type occurs. This avoids the need to otherwise run "dropbearkey" and avoids some problems with badly seeded /dev/urandom when systems first boot. @@ -173,6 +168,11 @@ If you test it please contact the Dropbear author */ * ECDSA above */ #define DROPBEAR_ECDH +/* Group14 (2048 bit) is recommended. Group1 is less secure (1024 bit) though + is the only option for interoperability with some older SSH programs */ +#define DROPBEAR_DH_GROUP1 1 +#define DROPBEAR_DH_GROUP14 1 + /* Control the memory/performance/compression tradeoff for zlib. * Set windowBits=8 for least memory usage, see your system's * zlib.h for full details. diff --git a/sysoptions.h b/sysoptions.h index 85ef718..8ce4361 100644 --- a/sysoptions.h +++ b/sysoptions.h @@ -113,20 +113,25 @@ #define RSA_BLINDING /* hashes which will be linked and registered */ -#if defined(DROPBEAR_SHA2_256_HMAC) || defined(DROPBEAR_ECC_256) || defined(DROPBEAR_CURVE25519) +#if defined(DROPBEAR_SHA2_256_HMAC) || defined(DROPBEAR_ECC_256) || defined(DROPBEAR_CURVE25519) || DROPBEAR_DH_GROUP14 #define DROPBEAR_SHA256 #endif #if defined(DROPBEAR_ECC_384) #define DROPBEAR_SHA384 #endif /* LTC SHA384 depends on SHA512 */ -#if defined(DROPBEAR_SHA2_512_HMAC) || defined(DROPBEAR_ECC_521) || defined(DROPBEAR_ECC_384) +#if defined(DROPBEAR_SHA2_512_HMAC) || defined(DROPBEAR_ECC_521) || defined(DROPBEAR_ECC_384) || DROPBEAR_DH_GROUP16 #define DROPBEAR_SHA512 #endif #if defined(DROPBEAR_MD5_HMAC) #define DROPBEAR_MD5 #endif +/* These are disabled in Dropbear 2016.73 by default since the spec + draft-ietf-curdle-ssh-kex-sha2-02 is under development. */ +#define DROPBEAR_DH_GROUP14_256 0 +#define DROPBEAR_DH_GROUP16 0 + /* roughly 2x 521 bits */ #define MAX_ECC_SIZE 140 |