Mercurial > dropbear
annotate libtomcrypt/src/mac/xcbc/xcbc_init.c @ 1629:258b57b208ae
Fix for issue successfull login of disabled user (#78)
This commit introduces fix for scenario:
1. Root login disabled on dropbear
2. PAM authentication model enabled
While login as root user, after prompt for password
user is being notified about login failrue, but
after second attempt of prompt for password within
same session, login becames succesfull.
Signed-off-by: Pawel Rapkiewicz <[email protected]>
author | vincentto13 <33652988+vincentto13@users.noreply.github.com> |
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date | Wed, 20 Mar 2019 15:03:40 +0100 |
parents | 6dba84798cd5 |
children |
rev | line source |
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382
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 */ |
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9 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file xcbc_init.c |
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13 XCBC Support, start an XCBC state |
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14 */ |
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15 |
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16 #ifdef LTC_XCBC |
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17 |
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18 /** Initialize XCBC-MAC state |
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19 @param xcbc [out] XCBC state to initialize |
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20 @param cipher Index of cipher to use |
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21 @param key [in] Secret key |
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22 @param keylen Length of secret key in octets |
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23 Return CRYPT_OK on success |
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24 */ |
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25 int xcbc_init(xcbc_state *xcbc, int cipher, const unsigned char *key, unsigned long keylen) |
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26 { |
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27 int x, y, err; |
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28 symmetric_key *skey; |
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29 unsigned long k1; |
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30 |
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31 LTC_ARGCHK(xcbc != NULL); |
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32 LTC_ARGCHK(key != NULL); |
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33 |
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34 /* schedule the key */ |
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35 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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36 return err; |
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37 } |
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38 |
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39 #ifdef LTC_FAST |
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40 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) { |
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41 return CRYPT_INVALID_ARG; |
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42 } |
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43 #endif |
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44 |
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45 skey = NULL; |
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46 |
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47 /* are we in pure XCBC mode with three keys? */ |
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48 if (keylen & LTC_XCBC_PURE) { |
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49 keylen &= ~LTC_XCBC_PURE; |
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50 |
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51 if (keylen < 2UL*cipher_descriptor[cipher].block_length) { |
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52 return CRYPT_INVALID_ARG; |
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53 } |
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54 |
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55 k1 = keylen - 2*cipher_descriptor[cipher].block_length; |
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56 XMEMCPY(xcbc->K[0], key, k1); |
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57 XMEMCPY(xcbc->K[1], key+k1, cipher_descriptor[cipher].block_length); |
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58 XMEMCPY(xcbc->K[2], key+k1 + cipher_descriptor[cipher].block_length, cipher_descriptor[cipher].block_length); |
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59 } else { |
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60 /* use the key expansion */ |
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61 k1 = cipher_descriptor[cipher].block_length; |
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62 |
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63 /* schedule the user key */ |
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64 skey = XCALLOC(1, sizeof(*skey)); |
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65 if (skey == NULL) { |
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66 return CRYPT_MEM; |
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67 } |
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68 |
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69 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, skey)) != CRYPT_OK) { |
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70 goto done; |
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71 } |
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72 |
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73 /* make the three keys */ |
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74 for (y = 0; y < 3; y++) { |
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75 for (x = 0; x < cipher_descriptor[cipher].block_length; x++) { |
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76 xcbc->K[y][x] = y + 1; |
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77 } |
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78 cipher_descriptor[cipher].ecb_encrypt(xcbc->K[y], xcbc->K[y], skey); |
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79 } |
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80 } |
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81 |
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82 /* setup K1 */ |
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83 err = cipher_descriptor[cipher].setup(xcbc->K[0], k1, 0, &xcbc->key); |
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84 |
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85 /* setup struct */ |
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86 zeromem(xcbc->IV, cipher_descriptor[cipher].block_length); |
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87 xcbc->blocksize = cipher_descriptor[cipher].block_length; |
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88 xcbc->cipher = cipher; |
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89 xcbc->buflen = 0; |
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90 done: |
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91 cipher_descriptor[cipher].done(skey); |
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92 if (skey != NULL) { |
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93 #ifdef LTC_CLEAN_STACK |
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94 zeromem(skey, sizeof(*skey)); |
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95 #endif |
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96 XFREE(skey); |
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97 } |
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98 return err; |
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99 } |
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100 |
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101 #endif |
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102 |
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103 /* ref: $Format:%D$ */ |
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104 /* git commit: $Format:%H$ */ |
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105 /* commit time: $Format:%ai$ */ |
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106 |