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Add verification of checksum for -m 13100
This avoid collisions by arc4'ing all data then hmac-md5 when valid ASN1 structures headers are found. Performance should not be impacted.
This commit is contained in:
Fist0urs
parent
96bde85378
commit
62bed36638
@ -1,7 +1,7 @@
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/**
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* Authors......: Jens Steube <jens.steube@gmail.com>
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* Authors......: Fist0urs <eddy.maaalou@gmail.com>
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*
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* License.....: MIT
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*/
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@ -140,40 +140,6 @@ static u8 rc4_next_16 (__local RC4_KEY *rc4_key, u8 i, u8 j, __global u32 in[4],
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return j;
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}
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static int decrypt_and_check (__local RC4_KEY *rc4_key, u32 data[4], __global u32* edata2)
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{
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rc4_init_16 (rc4_key, data);
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u32 out[8];
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u8 j = 0;
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/*
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8 first bytes are nonce, then ASN1 structs (DER encoding: type-length-data)
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if length >= 128 bytes:
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length is on 2 bytes and type is \x63\x82 (encode_krb5_enc_tkt_part) and data is an ASN1 sequence \x30\x82
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else:
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length is on 1 byte and type is \x63\x81 and data is an ASN1 sequence \x30\x81
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next headers follow the same ASN1 "type-length-data" scheme
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*/
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j = rc4_next_16 (rc4_key, 0, 0, edata2, out);
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if (((out[2] & 0xff00ffff) != 0x30008163) && ((out[2] & 0x0000ffff) != 0x00008263)) return 0;
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j = rc4_next_16 (rc4_key, 16, j, edata2 + 4, out + 4);
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if (((out[4] & 0x00ffffff) != 0x00000503) && (out[4] != 0x050307A0)) return 0;
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// TODO (or not): add RC4'ing of all edata2 then hmac-md5 and compare with
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// checksum to be definitely sure that this is the correct pass (even if
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// collisions must be very rare)
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return 1;
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}
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static void md4_transform (const u32 w0[4], const u32 w1[4], const u32 w2[4], const u32 w3[4], u32 digest[4])
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{
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u32 a = digest[0];
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@ -421,8 +387,207 @@ static void hmac_md5_run (u32 w0[4], u32 w1[4], u32 w2[4], u32 w3[4], u32 ipad[4
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md5_transform (w0, w1, w2, w3, digest);
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}
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static int decrypt_and_check (__local RC4_KEY *rc4_key, u32 data[4], __global u32 *edata2, const u32 edata2_len, const u32 K2[4], const u32 checksum[4])
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{
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rc4_init_16 (rc4_key, data);
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static void kerb_prepare (const u32 w0[4], const u32 w1[4], const u32 pw_len, const u32 checksum[4], u32 digest[4])
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u32 out0[4];
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u32 out1[4];
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u8 i = 0;
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u8 j = 0;
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/*
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8 first bytes are nonce, then ASN1 structs (DER encoding: type-length-data)
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if length >= 128 bytes:
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length is on 2 bytes and type is \x63\x82 (encode_krb5_enc_tkt_part) and data is an ASN1 sequence \x30\x82
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else:
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length is on 1 byte and type is \x63\x81 and data is an ASN1 sequence \x30\x81
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next headers follow the same ASN1 "type-length-data" scheme
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*/
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j = rc4_next_16 (rc4_key, i, j, edata2 + 0, out0); i += 16;
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if (((out0[2] & 0xff00ffff) != 0x30008163) && ((out0[2] & 0x0000ffff) != 0x00008263)) return 0;
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j = rc4_next_16 (rc4_key, i, j, edata2 + 4, out1); i += 16;
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if (((out1[0] & 0x00ffffff) != 0x00000503) && (out1[0] != 0x050307A0)) return 0;
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rc4_init_16 (rc4_key, data);
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i = 0;
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j = 0;
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// init hmac
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u32 w0[4];
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u32 w1[4];
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u32 w2[4];
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u32 w3[4];
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w0[0] = K2[0];
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w0[1] = K2[1];
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w0[2] = K2[2];
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w0[3] = K2[3];
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w1[0] = 0;
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w1[1] = 0;
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w1[2] = 0;
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w1[3] = 0;
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w2[0] = 0;
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w2[1] = 0;
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w2[2] = 0;
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w2[3] = 0;
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w3[0] = 0;
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w3[1] = 0;
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w3[2] = 0;
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w3[3] = 0;
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u32 ipad[4];
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u32 opad[4];
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hmac_md5_pad (w0, w1, w2, w3, ipad, opad);
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int edata2_left;
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for (edata2_left = edata2_len; edata2_left >= 64; edata2_left -= 64)
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{
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j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
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j = rc4_next_16 (rc4_key, i, j, edata2, w1); i += 16; edata2 += 4;
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j = rc4_next_16 (rc4_key, i, j, edata2, w2); i += 16; edata2 += 4;
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j = rc4_next_16 (rc4_key, i, j, edata2, w3); i += 16; edata2 += 4;
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md5_transform (w0, w1, w2, w3, ipad);
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}
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w0[0] = 0;
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w0[1] = 0;
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w0[2] = 0;
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w0[3] = 0;
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w1[0] = 0;
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w1[1] = 0;
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w1[2] = 0;
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w1[3] = 0;
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w2[0] = 0;
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w2[1] = 0;
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w2[2] = 0;
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w2[3] = 0;
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w3[0] = 0;
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w3[1] = 0;
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w3[2] = 0;
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w3[3] = 0;
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if (edata2_left < 16)
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{
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j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
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truncate_block (w0, edata2_left & 0xf);
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append_0x80_1x4 (w0, edata2_left & 0xf);
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w3[2] = (64 + edata2_len) * 8;
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w3[3] = 0;
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md5_transform (w0, w1, w2, w3, ipad);
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}
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else if (edata2_left < 32)
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{
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j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
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j = rc4_next_16 (rc4_key, i, j, edata2, w1); i += 16; edata2 += 4;
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truncate_block (w1, edata2_left & 0xf);
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append_0x80_1x4 (w1, edata2_left & 0xf);
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w3[2] = (64 + edata2_len) * 8;
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w3[3] = 0;
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md5_transform (w0, w1, w2, w3, ipad);
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}
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else if (edata2_left < 48)
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{
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j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
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j = rc4_next_16 (rc4_key, i, j, edata2, w1); i += 16; edata2 += 4;
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j = rc4_next_16 (rc4_key, i, j, edata2, w2); i += 16; edata2 += 4;
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truncate_block (w2, edata2_left & 0xf);
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append_0x80_1x4 (w2, edata2_left & 0xf);
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w3[2] = (64 + edata2_len) * 8;
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w3[3] = 0;
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md5_transform (w0, w1, w2, w3, ipad);
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}
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else
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{
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j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
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j = rc4_next_16 (rc4_key, i, j, edata2, w1); i += 16; edata2 += 4;
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j = rc4_next_16 (rc4_key, i, j, edata2, w2); i += 16; edata2 += 4;
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j = rc4_next_16 (rc4_key, i, j, edata2, w3); i += 16; edata2 += 4;
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truncate_block (w3, edata2_left & 0xf);
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append_0x80_1x4 (w3, edata2_left & 0xf);
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if (edata2_left < 56)
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{
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w3[2] = (64 + edata2_len) * 8;
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w3[3] = 0;
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md5_transform (w0, w1, w2, w3, ipad);
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}
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else
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{
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md5_transform (w0, w1, w2, w3, ipad);
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w0[0] = 0;
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w0[1] = 0;
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w0[2] = 0;
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w0[3] = 0;
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w1[0] = 0;
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w1[1] = 0;
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w1[2] = 0;
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w1[3] = 0;
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w2[0] = 0;
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w2[1] = 0;
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w2[2] = 0;
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w2[3] = 0;
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w3[0] = 0;
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w3[1] = 0;
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w3[2] = (64 + edata2_len) * 8;
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w3[3] = 0;
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md5_transform (w0, w1, w2, w3, ipad);
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}
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}
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w0[0] = ipad[0];
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w0[1] = ipad[1];
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w0[2] = ipad[2];
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w0[3] = ipad[3];
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w1[0] = 0x80;
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w1[1] = 0;
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w1[2] = 0;
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w1[3] = 0;
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w2[0] = 0;
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w2[1] = 0;
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w2[2] = 0;
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w2[3] = 0;
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w3[0] = 0;
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w3[1] = 0;
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w3[2] = (64 + 16) * 8;
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w3[3] = 0;
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md5_transform (w0, w1, w2, w3, opad);
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if (checksum[0] != opad[0]) return 0;
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if (checksum[1] != opad[1]) return 0;
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if (checksum[2] != opad[2]) return 0;
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if (checksum[3] != opad[3]) return 0;
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return 1;
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}
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static void kerb_prepare (const u32 w0[4], const u32 w1[4], const u32 pw_len, const u32 checksum[4], u32 digest[4], u32 K2[4])
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{
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/**
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* pads
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@ -510,6 +675,13 @@ static void kerb_prepare (const u32 w0[4], const u32 w1[4], const u32 pw_len, co
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hmac_md5_run (w0_t, w1_t, w2_t, w3_t, ipad, opad, digest);
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// K2 = K1;
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K2[0] = digest[0];
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K2[1] = digest[1];
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K2[2] = digest[2];
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K2[3] = digest[3];
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// K3=MD5_HMAC(K1,checksum);
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w0_t[0] = digest[0];
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@ -551,6 +723,60 @@ static void kerb_prepare (const u32 w0[4], const u32 w1[4], const u32 pw_len, co
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hmac_md5_run (w0_t, w1_t, w2_t, w3_t, ipad, opad, digest);
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}
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static void m13100 (__local RC4_KEY *rc4_keys, u32 w0[4], u32 w1[4], u32 w2[4], u32 w3[4], const u32 pw_len, __global pw_t *pws, __global kernel_rule_t *rules_buf, __global comb_t *combs_buf, __global bf_t *bfs_buf, __global void *tmps, __global void *hooks, __global u32 *bitmaps_buf_s1_a, __global u32 *bitmaps_buf_s1_b, __global u32 *bitmaps_buf_s1_c, __global u32 *bitmaps_buf_s1_d, __global u32 *bitmaps_buf_s2_a, __global u32 *bitmaps_buf_s2_b, __global u32 *bitmaps_buf_s2_c, __global u32 *bitmaps_buf_s2_d, __global plain_t *plains_buf, __global digest_t *digests_buf, __global u32 *hashes_shown, __global salt_t *salt_bufs, __global krb5tgs_t *krb5tgs_bufs, __global u32 *d_return_buf, __global u32 *d_scryptV_buf, const u32 bitmap_mask, const u32 bitmap_shift1, const u32 bitmap_shift2, const u32 salt_pos, const u32 loop_pos, const u32 loop_cnt, const u32 bfs_cnt, const u32 digests_cnt, const u32 digests_offset)
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{
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/**
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* modifier
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*/
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const u32 gid = get_global_id (0);
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const u32 lid = get_local_id (0);
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/**
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* salt
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*/
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u32 checksum[4];
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checksum[0] = krb5tgs_bufs[salt_pos].checksum[0];
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checksum[1] = krb5tgs_bufs[salt_pos].checksum[1];
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checksum[2] = krb5tgs_bufs[salt_pos].checksum[2];
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checksum[3] = krb5tgs_bufs[salt_pos].checksum[3];
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/**
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* loop
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*/
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u32 w0l = w0[0];
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for (u32 il_pos = 0; il_pos < bfs_cnt; il_pos++)
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{
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const u32 w0r = bfs_buf[il_pos].i;
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w0[0] = w0l | w0r;
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u32 digest[4];
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u32 K2[4];
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kerb_prepare (w0, w1, pw_len, checksum, digest, K2);
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u32 tmp[4];
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tmp[0] = digest[0];
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tmp[1] = digest[1];
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tmp[2] = digest[2];
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tmp[3] = digest[3];
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if (decrypt_and_check (&rc4_keys[lid], tmp, krb5tgs_bufs[salt_pos].edata2, krb5tgs_bufs[salt_pos].edata2_len, K2, checksum) == 1)
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{
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mark_hash (plains_buf, hashes_shown, digests_offset, gid, il_pos);
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d_return_buf[lid] = 1;
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}
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}
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}
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__kernel void m13100_m04 (__global pw_t *pws, __global kernel_rule_t *rules_buf, __global comb_t *combs_buf, __global bf_t *bfs_buf, __global void *tmps, __global void *hooks, __global u32 *bitmaps_buf_s1_a, __global u32 *bitmaps_buf_s1_b, __global u32 *bitmaps_buf_s1_c, __global u32 *bitmaps_buf_s1_d, __global u32 *bitmaps_buf_s2_a, __global u32 *bitmaps_buf_s2_b, __global u32 *bitmaps_buf_s2_c, __global u32 *bitmaps_buf_s2_d, __global plain_t *plains_buf, __global digest_t *digests_buf, __global u32 *hashes_shown, __global salt_t *salt_bufs, __global krb5tgs_t *krb5tgs_bufs, __global u32 *d_return_buf, __global u32 *d_scryptV_buf, const u32 bitmap_mask, const u32 bitmap_shift1, const u32 bitmap_shift2, const u32 salt_pos, const u32 loop_pos, const u32 loop_cnt, const u32 rules_cnt, const u32 digests_cnt, const u32 digests_offset, const u32 combs_mode, const u32 gid_max)
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{
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/**
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@ -637,7 +863,9 @@ __kernel void m13100_m04 (__global pw_t *pws, __global kernel_rule_t *rules_buf,
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u32 digest[4];
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kerb_prepare (w0, w1, out_len, checksum, digest);
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u32 K2[4];
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kerb_prepare (w0, w1, pw_len, checksum, digest, K2);
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u32 tmp[4];
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@ -646,7 +874,7 @@ __kernel void m13100_m04 (__global pw_t *pws, __global kernel_rule_t *rules_buf,
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tmp[2] = digest[2];
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tmp[3] = digest[3];
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if (decrypt_and_check (&rc4_keys[lid], tmp, krb5tgs_bufs[salt_pos].edata2) == 1)
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if (decrypt_and_check (&rc4_keys[lid], tmp, krb5tgs_bufs[salt_pos].edata2, krb5tgs_bufs[salt_pos].edata2_len, K2, checksum) == 1)
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{
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mark_hash (plains_buf, hashes_shown, digests_offset, gid, il_pos);
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@ -749,7 +977,9 @@ __kernel void m13100_s04 (__global pw_t *pws, __global kernel_rule_t *rules_buf,
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u32 digest[4];
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kerb_prepare (w0, w1, out_len, checksum, digest);
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u32 K2[4];
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kerb_prepare (w0, w1, pw_len, checksum, digest, K2);
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u32 tmp[4];
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@ -758,7 +988,7 @@ __kernel void m13100_s04 (__global pw_t *pws, __global kernel_rule_t *rules_buf,
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tmp[2] = digest[2];
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tmp[3] = digest[3];
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if (decrypt_and_check (&rc4_keys[lid], tmp, krb5tgs_bufs[salt_pos].edata2) == 1)
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if (decrypt_and_check (&rc4_keys[lid], tmp, krb5tgs_bufs[salt_pos].edata2, krb5tgs_bufs[salt_pos].edata2_len, K2, checksum) == 1)
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{
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mark_hash (plains_buf, hashes_shown, digests_offset, gid, il_pos);
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@ -1,7 +1,7 @@
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/**
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* Authors......: Jens Steube <jens.steube@gmail.com>
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* Authors......: Fist0urs <eddy.maaalou@gmail.com>
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*
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* License.....: MIT
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*/
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|
||||
@ -138,40 +138,6 @@ static u8 rc4_next_16 (__local RC4_KEY *rc4_key, u8 i, u8 j, __global u32 in[4],
|
||||
return j;
|
||||
}
|
||||
|
||||
static int decrypt_and_check (__local RC4_KEY *rc4_key, u32 data[4], __global u32* edata2)
|
||||
{
|
||||
rc4_init_16 (rc4_key, data);
|
||||
|
||||
u32 out[8];
|
||||
|
||||
u8 j = 0;
|
||||
|
||||
/*
|
||||
8 first bytes are nonce, then ASN1 structs (DER encoding: type-length-data)
|
||||
|
||||
if length >= 128 bytes:
|
||||
length is on 2 bytes and type is \x63\x82 (encode_krb5_enc_tkt_part) and data is an ASN1 sequence \x30\x82
|
||||
else:
|
||||
length is on 1 byte and type is \x63\x81 and data is an ASN1 sequence \x30\x81
|
||||
|
||||
next headers follow the same ASN1 "type-length-data" scheme
|
||||
*/
|
||||
|
||||
j = rc4_next_16 (rc4_key, 0, 0, edata2, out);
|
||||
|
||||
if (((out[2] & 0xff00ffff) != 0x30008163) && ((out[2] & 0x0000ffff) != 0x00008263)) return 0;
|
||||
|
||||
j = rc4_next_16 (rc4_key, 16, j, edata2 + 4, out + 4);
|
||||
|
||||
if (((out[4] & 0x00ffffff) != 0x00000503) && (out[4] != 0x050307A0)) return 0;
|
||||
|
||||
// TODO (or not): add RC4'ing of all edata2 then hmac-md5 and compare with
|
||||
// checksum to be definitely sure that this is the correct pass (even if
|
||||
// collisions must be very rare)
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static void md4_transform (const u32 w0[4], const u32 w1[4], const u32 w2[4], const u32 w3[4], u32 digest[4])
|
||||
{
|
||||
u32 a = digest[0];
|
||||
@ -419,7 +385,207 @@ static void hmac_md5_run (u32 w0[4], u32 w1[4], u32 w2[4], u32 w3[4], u32 ipad[4
|
||||
md5_transform (w0, w1, w2, w3, digest);
|
||||
}
|
||||
|
||||
static void kerb_prepare (const u32 w0[4], const u32 w1[4], const u32 pw_len, const u32 checksum[4], u32 digest[4])
|
||||
static int decrypt_and_check (__local RC4_KEY *rc4_key, u32 data[4], __global u32 *edata2, const u32 edata2_len, const u32 K2[4], const u32 checksum[4])
|
||||
{
|
||||
rc4_init_16 (rc4_key, data);
|
||||
|
||||
u32 out0[4];
|
||||
u32 out1[4];
|
||||
|
||||
u8 i = 0;
|
||||
u8 j = 0;
|
||||
|
||||
/*
|
||||
8 first bytes are nonce, then ASN1 structs (DER encoding: type-length-data)
|
||||
|
||||
if length >= 128 bytes:
|
||||
length is on 2 bytes and type is \x63\x82 (encode_krb5_enc_tkt_part) and data is an ASN1 sequence \x30\x82
|
||||
else:
|
||||
length is on 1 byte and type is \x63\x81 and data is an ASN1 sequence \x30\x81
|
||||
|
||||
next headers follow the same ASN1 "type-length-data" scheme
|
||||
*/
|
||||
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2 + 0, out0); i += 16;
|
||||
|
||||
if (((out0[2] & 0xff00ffff) != 0x30008163) && ((out0[2] & 0x0000ffff) != 0x00008263)) return 0;
|
||||
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2 + 4, out1); i += 16;
|
||||
|
||||
if (((out1[0] & 0x00ffffff) != 0x00000503) && (out1[0] != 0x050307A0)) return 0;
|
||||
|
||||
rc4_init_16 (rc4_key, data);
|
||||
|
||||
i = 0;
|
||||
j = 0;
|
||||
|
||||
// init hmac
|
||||
|
||||
u32 w0[4];
|
||||
u32 w1[4];
|
||||
u32 w2[4];
|
||||
u32 w3[4];
|
||||
|
||||
w0[0] = K2[0];
|
||||
w0[1] = K2[1];
|
||||
w0[2] = K2[2];
|
||||
w0[3] = K2[3];
|
||||
w1[0] = 0;
|
||||
w1[1] = 0;
|
||||
w1[2] = 0;
|
||||
w1[3] = 0;
|
||||
w2[0] = 0;
|
||||
w2[1] = 0;
|
||||
w2[2] = 0;
|
||||
w2[3] = 0;
|
||||
w3[0] = 0;
|
||||
w3[1] = 0;
|
||||
w3[2] = 0;
|
||||
w3[3] = 0;
|
||||
|
||||
u32 ipad[4];
|
||||
u32 opad[4];
|
||||
|
||||
hmac_md5_pad (w0, w1, w2, w3, ipad, opad);
|
||||
|
||||
int edata2_left;
|
||||
|
||||
for (edata2_left = edata2_len; edata2_left >= 64; edata2_left -= 64)
|
||||
{
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w1); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w2); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w3); i += 16; edata2 += 4;
|
||||
|
||||
md5_transform (w0, w1, w2, w3, ipad);
|
||||
}
|
||||
|
||||
w0[0] = 0;
|
||||
w0[1] = 0;
|
||||
w0[2] = 0;
|
||||
w0[3] = 0;
|
||||
w1[0] = 0;
|
||||
w1[1] = 0;
|
||||
w1[2] = 0;
|
||||
w1[3] = 0;
|
||||
w2[0] = 0;
|
||||
w2[1] = 0;
|
||||
w2[2] = 0;
|
||||
w2[3] = 0;
|
||||
w3[0] = 0;
|
||||
w3[1] = 0;
|
||||
w3[2] = 0;
|
||||
w3[3] = 0;
|
||||
|
||||
if (edata2_left < 16)
|
||||
{
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
|
||||
|
||||
truncate_block (w0, edata2_left & 0xf);
|
||||
append_0x80_1x4 (w0, edata2_left & 0xf);
|
||||
|
||||
w3[2] = (64 + edata2_len) * 8;
|
||||
w3[3] = 0;
|
||||
|
||||
md5_transform (w0, w1, w2, w3, ipad);
|
||||
}
|
||||
else if (edata2_left < 32)
|
||||
{
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w1); i += 16; edata2 += 4;
|
||||
|
||||
truncate_block (w1, edata2_left & 0xf);
|
||||
append_0x80_1x4 (w1, edata2_left & 0xf);
|
||||
|
||||
w3[2] = (64 + edata2_len) * 8;
|
||||
w3[3] = 0;
|
||||
|
||||
md5_transform (w0, w1, w2, w3, ipad);
|
||||
}
|
||||
else if (edata2_left < 48)
|
||||
{
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w1); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w2); i += 16; edata2 += 4;
|
||||
|
||||
truncate_block (w2, edata2_left & 0xf);
|
||||
append_0x80_1x4 (w2, edata2_left & 0xf);
|
||||
|
||||
w3[2] = (64 + edata2_len) * 8;
|
||||
w3[3] = 0;
|
||||
|
||||
md5_transform (w0, w1, w2, w3, ipad);
|
||||
}
|
||||
else
|
||||
{
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w1); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w2); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w3); i += 16; edata2 += 4;
|
||||
|
||||
truncate_block (w3, edata2_left & 0xf);
|
||||
append_0x80_1x4 (w3, edata2_left & 0xf);
|
||||
|
||||
if (edata2_left < 56)
|
||||
{
|
||||
w3[2] = (64 + edata2_len) * 8;
|
||||
w3[3] = 0;
|
||||
|
||||
md5_transform (w0, w1, w2, w3, ipad);
|
||||
}
|
||||
else
|
||||
{
|
||||
md5_transform (w0, w1, w2, w3, ipad);
|
||||
|
||||
w0[0] = 0;
|
||||
w0[1] = 0;
|
||||
w0[2] = 0;
|
||||
w0[3] = 0;
|
||||
w1[0] = 0;
|
||||
w1[1] = 0;
|
||||
w1[2] = 0;
|
||||
w1[3] = 0;
|
||||
w2[0] = 0;
|
||||
w2[1] = 0;
|
||||
w2[2] = 0;
|
||||
w2[3] = 0;
|
||||
w3[0] = 0;
|
||||
w3[1] = 0;
|
||||
w3[2] = (64 + edata2_len) * 8;
|
||||
w3[3] = 0;
|
||||
|
||||
md5_transform (w0, w1, w2, w3, ipad);
|
||||
}
|
||||
}
|
||||
|
||||
w0[0] = ipad[0];
|
||||
w0[1] = ipad[1];
|
||||
w0[2] = ipad[2];
|
||||
w0[3] = ipad[3];
|
||||
w1[0] = 0x80;
|
||||
w1[1] = 0;
|
||||
w1[2] = 0;
|
||||
w1[3] = 0;
|
||||
w2[0] = 0;
|
||||
w2[1] = 0;
|
||||
w2[2] = 0;
|
||||
w2[3] = 0;
|
||||
w3[0] = 0;
|
||||
w3[1] = 0;
|
||||
w3[2] = (64 + 16) * 8;
|
||||
w3[3] = 0;
|
||||
|
||||
md5_transform (w0, w1, w2, w3, opad);
|
||||
|
||||
if (checksum[0] != opad[0]) return 0;
|
||||
if (checksum[1] != opad[1]) return 0;
|
||||
if (checksum[2] != opad[2]) return 0;
|
||||
if (checksum[3] != opad[3]) return 0;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static void kerb_prepare (const u32 w0[4], const u32 w1[4], const u32 pw_len, const u32 checksum[4], u32 digest[4], u32 K2[4])
|
||||
{
|
||||
/**
|
||||
* pads
|
||||
@ -507,6 +673,13 @@ static void kerb_prepare (const u32 w0[4], const u32 w1[4], const u32 pw_len, co
|
||||
|
||||
hmac_md5_run (w0_t, w1_t, w2_t, w3_t, ipad, opad, digest);
|
||||
|
||||
// K2 = K1;
|
||||
|
||||
K2[0] = digest[0];
|
||||
K2[1] = digest[1];
|
||||
K2[2] = digest[2];
|
||||
K2[3] = digest[3];
|
||||
|
||||
// K3=MD5_HMAC(K1,checksum);
|
||||
|
||||
w0_t[0] = digest[0];
|
||||
@ -688,7 +861,9 @@ __kernel void m13100_m04 (__global pw_t *pws, __global kernel_rule_t *rules_buf,
|
||||
|
||||
u32 digest[4];
|
||||
|
||||
kerb_prepare (w0, w1, pw_len, checksum, digest);
|
||||
u32 K2[4];
|
||||
|
||||
kerb_prepare (w0, w1, pw_len, checksum, digest, K2);
|
||||
|
||||
u32 tmp[4];
|
||||
|
||||
@ -697,7 +872,7 @@ __kernel void m13100_m04 (__global pw_t *pws, __global kernel_rule_t *rules_buf,
|
||||
tmp[2] = digest[2];
|
||||
tmp[3] = digest[3];
|
||||
|
||||
if (decrypt_and_check (&rc4_keys[lid], tmp, krb5tgs_bufs[salt_pos].edata2) == 1)
|
||||
if (decrypt_and_check (&rc4_keys[lid], tmp, krb5tgs_bufs[salt_pos].edata2, krb5tgs_bufs[salt_pos].edata2_len, K2, checksum) == 1)
|
||||
{
|
||||
mark_hash (plains_buf, hashes_shown, digests_offset, gid, il_pos);
|
||||
|
||||
@ -854,7 +1029,9 @@ __kernel void m13100_s04 (__global pw_t *pws, __global kernel_rule_t *rules_buf,
|
||||
|
||||
u32 digest[4];
|
||||
|
||||
kerb_prepare (w0, w1, pw_len, checksum, digest);
|
||||
u32 K2[4];
|
||||
|
||||
kerb_prepare (w0, w1, pw_len, checksum, digest, K2);
|
||||
|
||||
u32 tmp[4];
|
||||
|
||||
@ -863,7 +1040,7 @@ __kernel void m13100_s04 (__global pw_t *pws, __global kernel_rule_t *rules_buf,
|
||||
tmp[2] = digest[2];
|
||||
tmp[3] = digest[3];
|
||||
|
||||
if (decrypt_and_check (&rc4_keys[lid], tmp, krb5tgs_bufs[salt_pos].edata2) == 1)
|
||||
if (decrypt_and_check (&rc4_keys[lid], tmp, krb5tgs_bufs[salt_pos].edata2, krb5tgs_bufs[salt_pos].edata2_len, K2, checksum) == 1)
|
||||
{
|
||||
mark_hash (plains_buf, hashes_shown, digests_offset, gid, il_pos);
|
||||
|
||||
|
||||
@ -138,40 +138,6 @@ static u8 rc4_next_16 (__local RC4_KEY *rc4_key, u8 i, u8 j, __global u32 in[4],
|
||||
return j;
|
||||
}
|
||||
|
||||
static int decrypt_and_check (__local RC4_KEY *rc4_key, u32 data[4], __global u32* edata2)
|
||||
{
|
||||
rc4_init_16 (rc4_key, data);
|
||||
|
||||
u32 out[8];
|
||||
|
||||
u8 j = 0;
|
||||
|
||||
/*
|
||||
8 first bytes are nonce, then ASN1 structs (DER encoding: type-length-data)
|
||||
|
||||
if length >= 128 bytes:
|
||||
length is on 2 bytes and type is \x63\x82 (encode_krb5_enc_tkt_part) and data is an ASN1 sequence \x30\x82
|
||||
else:
|
||||
length is on 1 byte and type is \x63\x81 and data is an ASN1 sequence \x30\x81
|
||||
|
||||
next headers follow the same ASN1 "type-length-data" scheme
|
||||
*/
|
||||
|
||||
j = rc4_next_16 (rc4_key, 0, 0, edata2, out);
|
||||
|
||||
if (((out[2] & 0xff00ffff) != 0x30008163) && ((out[2] & 0x0000ffff) != 0x00008263)) return 0;
|
||||
|
||||
j = rc4_next_16 (rc4_key, 16, j, edata2 + 4, out + 4);
|
||||
|
||||
if (((out[4] & 0x00ffffff) != 0x00000503) && (out[4] != 0x050307A0)) return 0;
|
||||
|
||||
// TODO (or not): add RC4'ing of all edata2 then hmac-md5 and compare with
|
||||
// checksum to be definitely sure that this is the correct pass (even if
|
||||
// collisions must be very rare)
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static void md4_transform (const u32 w0[4], const u32 w1[4], const u32 w2[4], const u32 w3[4], u32 digest[4])
|
||||
{
|
||||
u32 a = digest[0];
|
||||
@ -419,7 +385,207 @@ static void hmac_md5_run (u32 w0[4], u32 w1[4], u32 w2[4], u32 w3[4], u32 ipad[4
|
||||
md5_transform (w0, w1, w2, w3, digest);
|
||||
}
|
||||
|
||||
static void kerb_prepare (const u32 w0[4], const u32 w1[4], const u32 pw_len, const u32 checksum[4], u32 digest[4])
|
||||
static int decrypt_and_check (__local RC4_KEY *rc4_key, u32 data[4], __global u32 *edata2, const u32 edata2_len, const u32 K2[4], const u32 checksum[4])
|
||||
{
|
||||
rc4_init_16 (rc4_key, data);
|
||||
|
||||
u32 out0[4];
|
||||
u32 out1[4];
|
||||
|
||||
u8 i = 0;
|
||||
u8 j = 0;
|
||||
|
||||
/*
|
||||
8 first bytes are nonce, then ASN1 structs (DER encoding: type-length-data)
|
||||
|
||||
if length >= 128 bytes:
|
||||
length is on 2 bytes and type is \x63\x82 (encode_krb5_enc_tkt_part) and data is an ASN1 sequence \x30\x82
|
||||
else:
|
||||
length is on 1 byte and type is \x63\x81 and data is an ASN1 sequence \x30\x81
|
||||
|
||||
next headers follow the same ASN1 "type-length-data" scheme
|
||||
*/
|
||||
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2 + 0, out0); i += 16;
|
||||
|
||||
if (((out0[2] & 0xff00ffff) != 0x30008163) && ((out0[2] & 0x0000ffff) != 0x00008263)) return 0;
|
||||
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2 + 4, out1); i += 16;
|
||||
|
||||
if (((out1[0] & 0x00ffffff) != 0x00000503) && (out1[0] != 0x050307A0)) return 0;
|
||||
|
||||
rc4_init_16 (rc4_key, data);
|
||||
|
||||
i = 0;
|
||||
j = 0;
|
||||
|
||||
// init hmac
|
||||
|
||||
u32 w0[4];
|
||||
u32 w1[4];
|
||||
u32 w2[4];
|
||||
u32 w3[4];
|
||||
|
||||
w0[0] = K2[0];
|
||||
w0[1] = K2[1];
|
||||
w0[2] = K2[2];
|
||||
w0[3] = K2[3];
|
||||
w1[0] = 0;
|
||||
w1[1] = 0;
|
||||
w1[2] = 0;
|
||||
w1[3] = 0;
|
||||
w2[0] = 0;
|
||||
w2[1] = 0;
|
||||
w2[2] = 0;
|
||||
w2[3] = 0;
|
||||
w3[0] = 0;
|
||||
w3[1] = 0;
|
||||
w3[2] = 0;
|
||||
w3[3] = 0;
|
||||
|
||||
u32 ipad[4];
|
||||
u32 opad[4];
|
||||
|
||||
hmac_md5_pad (w0, w1, w2, w3, ipad, opad);
|
||||
|
||||
int edata2_left;
|
||||
|
||||
for (edata2_left = edata2_len; edata2_left >= 64; edata2_left -= 64)
|
||||
{
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w1); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w2); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w3); i += 16; edata2 += 4;
|
||||
|
||||
md5_transform (w0, w1, w2, w3, ipad);
|
||||
}
|
||||
|
||||
w0[0] = 0;
|
||||
w0[1] = 0;
|
||||
w0[2] = 0;
|
||||
w0[3] = 0;
|
||||
w1[0] = 0;
|
||||
w1[1] = 0;
|
||||
w1[2] = 0;
|
||||
w1[3] = 0;
|
||||
w2[0] = 0;
|
||||
w2[1] = 0;
|
||||
w2[2] = 0;
|
||||
w2[3] = 0;
|
||||
w3[0] = 0;
|
||||
w3[1] = 0;
|
||||
w3[2] = 0;
|
||||
w3[3] = 0;
|
||||
|
||||
if (edata2_left < 16)
|
||||
{
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
|
||||
|
||||
truncate_block (w0, edata2_left & 0xf);
|
||||
append_0x80_1x4 (w0, edata2_left & 0xf);
|
||||
|
||||
w3[2] = (64 + edata2_len) * 8;
|
||||
w3[3] = 0;
|
||||
|
||||
md5_transform (w0, w1, w2, w3, ipad);
|
||||
}
|
||||
else if (edata2_left < 32)
|
||||
{
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w1); i += 16; edata2 += 4;
|
||||
|
||||
truncate_block (w1, edata2_left & 0xf);
|
||||
append_0x80_1x4 (w1, edata2_left & 0xf);
|
||||
|
||||
w3[2] = (64 + edata2_len) * 8;
|
||||
w3[3] = 0;
|
||||
|
||||
md5_transform (w0, w1, w2, w3, ipad);
|
||||
}
|
||||
else if (edata2_left < 48)
|
||||
{
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w1); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w2); i += 16; edata2 += 4;
|
||||
|
||||
truncate_block (w2, edata2_left & 0xf);
|
||||
append_0x80_1x4 (w2, edata2_left & 0xf);
|
||||
|
||||
w3[2] = (64 + edata2_len) * 8;
|
||||
w3[3] = 0;
|
||||
|
||||
md5_transform (w0, w1, w2, w3, ipad);
|
||||
}
|
||||
else
|
||||
{
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w0); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w1); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w2); i += 16; edata2 += 4;
|
||||
j = rc4_next_16 (rc4_key, i, j, edata2, w3); i += 16; edata2 += 4;
|
||||
|
||||
truncate_block (w3, edata2_left & 0xf);
|
||||
append_0x80_1x4 (w3, edata2_left & 0xf);
|
||||
|
||||
if (edata2_left < 56)
|
||||
{
|
||||
w3[2] = (64 + edata2_len) * 8;
|
||||
w3[3] = 0;
|
||||
|
||||
md5_transform (w0, w1, w2, w3, ipad);
|
||||
}
|
||||
else
|
||||
{
|
||||
md5_transform (w0, w1, w2, w3, ipad);
|
||||
|
||||
w0[0] = 0;
|
||||
w0[1] = 0;
|
||||
w0[2] = 0;
|
||||
w0[3] = 0;
|
||||
w1[0] = 0;
|
||||
w1[1] = 0;
|
||||
w1[2] = 0;
|
||||
w1[3] = 0;
|
||||
w2[0] = 0;
|
||||
w2[1] = 0;
|
||||
w2[2] = 0;
|
||||
w2[3] = 0;
|
||||
w3[0] = 0;
|
||||
w3[1] = 0;
|
||||
w3[2] = (64 + edata2_len) * 8;
|
||||
w3[3] = 0;
|
||||
|
||||
md5_transform (w0, w1, w2, w3, ipad);
|
||||
}
|
||||
}
|
||||
|
||||
w0[0] = ipad[0];
|
||||
w0[1] = ipad[1];
|
||||
w0[2] = ipad[2];
|
||||
w0[3] = ipad[3];
|
||||
w1[0] = 0x80;
|
||||
w1[1] = 0;
|
||||
w1[2] = 0;
|
||||
w1[3] = 0;
|
||||
w2[0] = 0;
|
||||
w2[1] = 0;
|
||||
w2[2] = 0;
|
||||
w2[3] = 0;
|
||||
w3[0] = 0;
|
||||
w3[1] = 0;
|
||||
w3[2] = (64 + 16) * 8;
|
||||
w3[3] = 0;
|
||||
|
||||
md5_transform (w0, w1, w2, w3, opad);
|
||||
|
||||
if (checksum[0] != opad[0]) return 0;
|
||||
if (checksum[1] != opad[1]) return 0;
|
||||
if (checksum[2] != opad[2]) return 0;
|
||||
if (checksum[3] != opad[3]) return 0;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static void kerb_prepare (const u32 w0[4], const u32 w1[4], const u32 pw_len, const u32 checksum[4], u32 digest[4], u32 K2[4])
|
||||
{
|
||||
/**
|
||||
* pads
|
||||
@ -507,6 +673,13 @@ static void kerb_prepare (const u32 w0[4], const u32 w1[4], const u32 pw_len, co
|
||||
|
||||
hmac_md5_run (w0_t, w1_t, w2_t, w3_t, ipad, opad, digest);
|
||||
|
||||
// K2 = K1;
|
||||
|
||||
K2[0] = digest[0];
|
||||
K2[1] = digest[1];
|
||||
K2[2] = digest[2];
|
||||
K2[3] = digest[3];
|
||||
|
||||
// K3=MD5_HMAC(K1,checksum);
|
||||
|
||||
w0_t[0] = digest[0];
|
||||
@ -582,7 +755,9 @@ static void m13100 (__local RC4_KEY *rc4_keys, u32 w0[4], u32 w1[4], u32 w2[4],
|
||||
|
||||
u32 digest[4];
|
||||
|
||||
kerb_prepare (w0, w1, pw_len, checksum, digest);
|
||||
u32 K2[4];
|
||||
|
||||
kerb_prepare (w0, w1, pw_len, checksum, digest, K2);
|
||||
|
||||
u32 tmp[4];
|
||||
|
||||
@ -591,7 +766,7 @@ static void m13100 (__local RC4_KEY *rc4_keys, u32 w0[4], u32 w1[4], u32 w2[4],
|
||||
tmp[2] = digest[2];
|
||||
tmp[3] = digest[3];
|
||||
|
||||
if (decrypt_and_check (&rc4_keys[lid], tmp, krb5tgs_bufs[salt_pos].edata2) == 1)
|
||||
if (decrypt_and_check (&rc4_keys[lid], tmp, krb5tgs_bufs[salt_pos].edata2, krb5tgs_bufs[salt_pos].edata2_len, K2, checksum) == 1)
|
||||
{
|
||||
mark_hash (plains_buf, hashes_shown, digests_offset, gid, il_pos);
|
||||
|
||||
|
||||
11
src/shared.c
11
src/shared.c
@ -8302,7 +8302,7 @@ void ascii_digest (char out_buf[4096], uint salt_pos, uint digest_pos)
|
||||
u8 *ptr_checksum = (u8 *) krb5tgs->checksum;
|
||||
u8 *ptr_edata2 = (u8 *) krb5tgs->edata2;
|
||||
|
||||
char data[256] = { 0 };
|
||||
char data[2560 * 4 * 2] = { 0 };
|
||||
|
||||
char *ptr_data = data;
|
||||
|
||||
@ -8312,11 +8312,9 @@ void ascii_digest (char out_buf[4096], uint salt_pos, uint digest_pos)
|
||||
/* skip '$' */
|
||||
ptr_data++;
|
||||
|
||||
for (uint i = 0; i < 32; i++, ptr_data += 2)
|
||||
for (uint i = 0; i < krb5tgs->edata2_len; i++, ptr_data += 2)
|
||||
sprintf (ptr_data, "%02x", ptr_edata2[i]);
|
||||
|
||||
*ptr_data = 0;
|
||||
|
||||
snprintf (out_buf, len-1, "%s$%s$%s$%s",
|
||||
SIGNATURE_KRB5TGS,
|
||||
(char *) krb5tgs->account_info,
|
||||
@ -18795,7 +18793,10 @@ int krb5tgs_parse_hash (char *input_buf, uint input_len, hash_t *hash_buf)
|
||||
| hex_convert (p0) << 4;
|
||||
}
|
||||
|
||||
krb5tgs->edata2_len = strlen (edata_ptr - input_len) / (2 * 4);
|
||||
/* this is needed for hmac_md5 */
|
||||
*edata_ptr++ = 0x80;
|
||||
|
||||
krb5tgs->edata2_len = (data_len - 32) / 2 ;
|
||||
|
||||
salt->salt_buf[0] = krb5tgs->checksum[0];
|
||||
salt->salt_buf[1] = krb5tgs->checksum[1];
|
||||
|
||||
@ -6704,7 +6704,7 @@ END_CODE
|
||||
|
||||
my $edata2 = $cipher->RC4 (pack ("H*", $cleartext_ticket));
|
||||
|
||||
$tmp_hash = sprintf ('$krb5tgs$23$*%s$%s$%s*$%s$%s', $user, $realm, $spn, unpack ("H*", $checksum), substr (unpack ("H*", $edata2), 0, 64));
|
||||
$tmp_hash = sprintf ('$krb5tgs$23$*%s$%s$%s*$%s$%s', $user, $realm, $spn, unpack ("H*", $checksum), unpack ("H*", $edata2));
|
||||
}
|
||||
|
||||
return ($tmp_hash);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user