Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/octet/der_decode_octet_string.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
285
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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 der_decode_octet_string.c
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13 ASN.1 DER, encode a OCTET STRING, Tom St Denis
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14 */
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15
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16
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17 #ifdef LTC_DER
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18
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19 /**
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20 Store a OCTET STRING
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21 @param in The DER encoded OCTET STRING
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22 @param inlen The size of the DER OCTET STRING
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23 @param out [out] The array of octets stored (one per char)
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24 @param outlen [in/out] The number of octets stored
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25 @return CRYPT_OK if successful
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26 */
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27 int der_decode_octet_string(const unsigned char *in, unsigned long inlen,
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28 unsigned char *out, unsigned long *outlen)
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29 {
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30 unsigned long x, y, len;
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31
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32 LTC_ARGCHK(in != NULL);
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33 LTC_ARGCHK(out != NULL);
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34 LTC_ARGCHK(outlen != NULL);
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35
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36 /* must have header at least */
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37 if (inlen < 2) {
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38 return CRYPT_INVALID_PACKET;
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39 }
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40
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41 /* check for 0x04 */
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42 if ((in[0] & 0x1F) != 0x04) {
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43 return CRYPT_INVALID_PACKET;
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44 }
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45 x = 1;
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46
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47 /* decode the length */
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48 if (in[x] & 0x80) {
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49 /* valid # of bytes in length are 1,2,3 */
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50 y = in[x] & 0x7F;
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51 if ((y == 0) || (y > 3) || ((x + y) > inlen)) {
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52 return CRYPT_INVALID_PACKET;
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53 }
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54
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55 /* read the length in */
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56 len = 0;
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57 ++x;
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58 while (y--) {
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59 len = (len << 8) | in[x++];
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60 }
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61 } else {
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62 len = in[x++] & 0x7F;
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63 }
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64
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65 /* is it too long? */
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66 if (len > *outlen) {
382
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67 *outlen = len;
285
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68 return CRYPT_BUFFER_OVERFLOW;
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69 }
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70
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71 if (len + x > inlen) {
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72 return CRYPT_INVALID_PACKET;
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73 }
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74
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75 /* read the data */
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76 for (y = 0; y < len; y++) {
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77 out[y] = in[x++];
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78 }
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79
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80 *outlen = y;
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81
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82 return CRYPT_OK;
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83 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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84
285
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85 #endif
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86
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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87 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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88 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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89 /* commit time: $Format:%ai$ */