Mercurial > dropbear

annotate libtomcrypt/src/modes/lrw/lrw_start.c @ 1629:258b57b208ae

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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>
date Wed, 20 Mar 2019 15:03:40 +0100
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 lrw_start.c
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13 LRW_MODE implementation, start mode, Tom St Denis
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14 */
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15
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16 #ifdef LTC_LRW_MODE
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17
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18 /**
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19 Initialize the LRW context
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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20 @param cipher The cipher desired, must be a 128-bit block cipher
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21 @param IV The index value, must be 128-bits
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22 @param key The cipher key
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23 @param keylen The length of the cipher key in octets
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24 @param tweak The tweak value (second key), must be 128-bits
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25 @param num_rounds The number of rounds for the cipher (0 == default)
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26 @param lrw [out] The LRW state
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27 @return CRYPT_OK on success.
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28 */
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29 int lrw_start( int cipher,
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30 const unsigned char *IV,
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31 const unsigned char *key, int keylen,
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32 const unsigned char *tweak,
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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33 int num_rounds,
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34 symmetric_LRW *lrw)
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35 {
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36 int err;
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37 #ifdef LTC_LRW_TABLES
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38 unsigned char B[16];
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39 int x, y, z, t;
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40 #endif
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41
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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42 LTC_ARGCHK(IV != NULL);
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43 LTC_ARGCHK(key != NULL);
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44 LTC_ARGCHK(tweak != NULL);
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45 LTC_ARGCHK(lrw != NULL);
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46
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47 #ifdef LTC_FAST
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48 if (16 % sizeof(LTC_FAST_TYPE)) {
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49 return CRYPT_INVALID_ARG;
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50 }
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51 #endif
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52
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53 /* is cipher valid? */
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54 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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55 return err;
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56 }
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57 if (cipher_descriptor[cipher].block_length != 16) {
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58 return CRYPT_INVALID_CIPHER;
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59 }
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60
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61 /* schedule key */
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62 if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &lrw->key)) != CRYPT_OK) {
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63 return err;
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64 }
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65 lrw->cipher = cipher;
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66
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67 /* copy the IV and tweak */
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68 XMEMCPY(lrw->tweak, tweak, 16);
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69
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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70 #ifdef LTC_LRW_TABLES
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71 /* setup tables */
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72 /* generate the first table as it has no shifting (from which we make the other tables) */
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73 zeromem(B, 16);
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74 for (y = 0; y < 256; y++) {
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75 B[0] = y;
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76 gcm_gf_mult(tweak, B, &lrw->PC[0][y][0]);
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77 }
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78
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79 /* now generate the rest of the tables based the previous table */
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80 for (x = 1; x < 16; x++) {
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81 for (y = 0; y < 256; y++) {
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82 /* now shift it right by 8 bits */
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83 t = lrw->PC[x-1][y][15];
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84 for (z = 15; z > 0; z--) {
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85 lrw->PC[x][y][z] = lrw->PC[x-1][y][z-1];
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86 }
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87 lrw->PC[x][y][0] = gcm_shift_table[t<<1];
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88 lrw->PC[x][y][1] ^= gcm_shift_table[(t<<1)+1];
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89 }
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90 }
382
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91 #endif
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92
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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93 /* generate first pad */
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94 return lrw_setiv(IV, 16, lrw);
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95 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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96
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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97
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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98 #endif
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99 /* ref: $Format:%D$ */
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100 /* git commit: $Format:%H$ */
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101 /* commit time: $Format:%ai$ */