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annotate libtomcrypt/src/pk/dh/dh_import.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
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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2 *
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
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10 #include "tomcrypt.h"
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11
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12 #ifdef LTC_MDH
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13
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14 /**
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15 Import a DH key from a binary packet
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16 @param in The packet to read
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17 @param inlen The length of the input packet
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18 @param key [out] Where to import the key to
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19 @return CRYPT_OK if successful, on error all allocated memory is freed automatically
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20 */
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21 int dh_import(const unsigned char *in, unsigned long inlen, dh_key *key)
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22 {
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23 unsigned char flags[1];
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24 int err;
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25 unsigned long version;
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26
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27 LTC_ARGCHK(in != NULL);
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28 LTC_ARGCHK(key != NULL);
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29
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30 /* init */
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31 if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) {
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32 return err;
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33 }
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34
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35 /* find out what type of key it is */
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36 err = der_decode_sequence_multi(in, inlen,
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37 LTC_ASN1_SHORT_INTEGER, 1UL, &version,
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38 LTC_ASN1_BIT_STRING, 1UL, &flags,
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39 LTC_ASN1_EOL, 0UL, NULL);
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40 if (err != CRYPT_OK && err != CRYPT_INPUT_TOO_LONG) {
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41 goto error;
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42 }
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43
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44 if (version == 0) {
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45 if (flags[0] == 1) {
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46 key->type = PK_PRIVATE;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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47 if ((err = der_decode_sequence_multi(in, inlen,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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48 LTC_ASN1_SHORT_INTEGER, 1UL, &version,
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49 LTC_ASN1_BIT_STRING, 1UL, flags,
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50 LTC_ASN1_INTEGER, 1UL, key->prime,
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51 LTC_ASN1_INTEGER, 1UL, key->base,
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52 LTC_ASN1_INTEGER, 1UL, key->x,
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53 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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54 goto error;
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55 }
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56 /* compute public key: y = (base ^ x) mod prime */
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57 if ((err = mp_exptmod(key->base, key->x, key->prime, key->y)) != CRYPT_OK) {
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58 goto error;
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59 }
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60 }
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61 else if (flags[0] == 0) {
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62 key->type = PK_PUBLIC;
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63 if ((err = der_decode_sequence_multi(in, inlen,
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64 LTC_ASN1_SHORT_INTEGER, 1UL, &version,
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65 LTC_ASN1_BIT_STRING, 1UL, flags,
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66 LTC_ASN1_INTEGER, 1UL, key->prime,
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67 LTC_ASN1_INTEGER, 1UL, key->base,
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68 LTC_ASN1_INTEGER, 1UL, key->y,
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69 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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70 goto error;
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71 }
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72 }
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73 else {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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74 err = CRYPT_INVALID_PACKET;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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75 goto error;
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76 }
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77 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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78 else {
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79 err = CRYPT_INVALID_PACKET;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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80 goto error;
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81 }
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82
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83 /* check public key */
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84 if ((err = dh_check_pubkey(key)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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85 goto error;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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86 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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87
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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88 return CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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89
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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90 error:
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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91 dh_free(key);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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92 return err;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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93 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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94
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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95 #endif /* LTC_MDH */
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96
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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97 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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98 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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99 /* commit time: $Format:%ai$ */