Mercurial > dropbear

annotate libtomcrypt/src/misc/base64/base64_decode.c @ 1665:7c17995bcdfb

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Improve address logging on early exit messages (#83) Change 'Early exit' and 'Exit before auth' messages to include the IP address & port as part of the message. This allows log scanning utilities such as 'fail2ban' to obtain the offending IP address as part of the failure event instead of extracting the PID from the message and then scanning the log again for match 'child connection from' messages Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
author Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
date Wed, 18 Mar 2020 15:28:56 +0000
parents 6dba84798cd5
children d885a77b98e0
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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 base64_decode.c
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13 Compliant base64 code donated by Wayne Scott ([email protected])
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14 base64 URL Safe variant (RFC 4648 section 5) by Karel Miko
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15 */
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16
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17
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18 #if defined(LTC_BASE64) || defined (LTC_BASE64_URL)
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19
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20 #if defined(LTC_BASE64)
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21 static const unsigned char map_base64[256] = {
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22 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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23 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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24 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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25 255, 255, 255, 255, 255, 255, 255, 62, 255, 255, 255, 63,
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26 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
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27 255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,
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28 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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29 19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 255,
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30 255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
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31 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
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32 49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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33 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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34 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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35 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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36 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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37 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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38 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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39 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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40 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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41 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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42 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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43 255, 255, 255, 255 };
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44 #endif /* LTC_BASE64 */
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45
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46 static const unsigned char map_base64url[] = {
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47 #if defined(LTC_BASE64_URL)
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48 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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49 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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50 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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51 255, 255, 255, 255, 255, 255, 255, 255, 255, 62, 255, 255,
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52 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
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53 255, 254, 255, 255, 255, 0, 1, 2, 3, 4, 5, 6,
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54 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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55 19, 20, 21, 22, 23, 24, 25, 255, 255, 255, 255, 63,
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56 255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36,
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57 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
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58 49, 50, 51, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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59 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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60 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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61 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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62 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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63 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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64 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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65 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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66 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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67 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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68 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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69 255, 255, 255, 255
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70 #endif /* LTC_BASE64_URL */
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71 };
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72
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73 enum {
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74 relaxed = 0,
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75 strict = 1
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76 };
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77
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78 static int _base64_decode_internal(const unsigned char *in, unsigned long inlen,
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79 unsigned char *out, unsigned long *outlen,
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80 const unsigned char *map, int is_strict)
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81 {
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82 unsigned long t, x, y, z;
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83 unsigned char c;
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84 int g;
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85
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86 LTC_ARGCHK(in != NULL);
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87 LTC_ARGCHK(out != NULL);
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88 LTC_ARGCHK(outlen != NULL);
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89
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90 g = 0; /* '=' counter */
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91 for (x = y = z = t = 0; x < inlen; x++) {
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92 c = map[in[x]&0xFF];
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93 if (c == 254) {
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diff changeset
94 g++;
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
95 continue;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
96 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
97 else if (is_strict && g > 0) {
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diff changeset
98 /* we only allow '=' to be at the end */
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diff changeset
99 return CRYPT_INVALID_PACKET;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
100 }
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
101 if (c == 255) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
102 if (is_strict)
285
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diff changeset
103 return CRYPT_INVALID_PACKET;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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104 else
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diff changeset
105 continue;
285
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parents:
diff changeset
106 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
diff changeset
107
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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diff changeset
108 t = (t<<6)|c;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
diff changeset
109
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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diff changeset
110 if (++y == 4) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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111 if (z + 3 > *outlen) return CRYPT_BUFFER_OVERFLOW;
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
diff changeset
112 out[z++] = (unsigned char)((t>>16)&255);
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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113 out[z++] = (unsigned char)((t>>8)&255);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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114 out[z++] = (unsigned char)(t&255);
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
115 y = t = 0;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
diff changeset
116 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
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117 }
1471
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diff changeset
118
285
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119 if (y != 0) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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120 if (y == 1) return CRYPT_INVALID_PACKET;
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121 if ((y + g) != 4 && is_strict && map != map_base64url) return CRYPT_INVALID_PACKET;
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diff changeset
122 t = t << (6 * (4 - y));
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diff changeset
123 if (z + y - 1 > *outlen) return CRYPT_BUFFER_OVERFLOW;
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diff changeset
124 if (y >= 2) out[z++] = (unsigned char) ((t >> 16) & 255);
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diff changeset
125 if (y == 3) out[z++] = (unsigned char) ((t >> 8) & 255);
285
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parents:
diff changeset
126 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
127 *outlen = z;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
diff changeset
128 return CRYPT_OK;
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129 }
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130
1471
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diff changeset
131 #if defined(LTC_BASE64)
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132 /**
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133 Relaxed base64 decode a block of memory
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134 @param in The base64 data to decode
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135 @param inlen The length of the base64 data
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136 @param out [out] The destination of the binary decoded data
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137 @param outlen [in/out] The max size and resulting size of the decoded data
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138 @return CRYPT_OK if successful
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139 */
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140 int base64_decode(const unsigned char *in, unsigned long inlen,
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141 unsigned char *out, unsigned long *outlen)
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142 {
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143 return _base64_decode_internal(in, inlen, out, outlen, map_base64, relaxed);
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144 }
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145
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146 /**
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147 Strict base64 decode a block of memory
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148 @param in The base64 data to decode
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149 @param inlen The length of the base64 data
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150 @param out [out] The destination of the binary decoded data
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151 @param outlen [in/out] The max size and resulting size of the decoded data
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152 @return CRYPT_OK if successful
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153 */
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154 int base64_strict_decode(const unsigned char *in, unsigned long inlen,
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155 unsigned char *out, unsigned long *outlen)
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156 {
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157 return _base64_decode_internal(in, inlen, out, outlen, map_base64, strict);
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158 }
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diff changeset
159 #endif /* LTC_BASE64 */
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diff changeset
160
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diff changeset
161 #if defined(LTC_BASE64_URL)
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162 /**
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diff changeset
163 Relaxed base64 (URL Safe, RFC 4648 section 5) decode a block of memory
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164 @param in The base64 data to decode
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165 @param inlen The length of the base64 data
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166 @param out [out] The destination of the binary decoded data
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167 @param outlen [in/out] The max size and resulting size of the decoded data
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diff changeset
168 @return CRYPT_OK if successful
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diff changeset
169 */
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diff changeset
170 int base64url_decode(const unsigned char *in, unsigned long inlen,
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diff changeset
171 unsigned char *out, unsigned long *outlen)
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diff changeset
172 {
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diff changeset
173 return _base64_decode_internal(in, inlen, out, outlen, map_base64url, relaxed);
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diff changeset
174 }
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diff changeset
175
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
176 /**
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177 Strict base64 (URL Safe, RFC 4648 section 5) decode a block of memory
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diff changeset
178 @param in The base64 data to decode
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diff changeset
179 @param inlen The length of the base64 data
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diff changeset
180 @param out [out] The destination of the binary decoded data
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diff changeset
181 @param outlen [in/out] The max size and resulting size of the decoded data
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diff changeset
182 @return CRYPT_OK if successful
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
183 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
184 int base64url_strict_decode(const unsigned char *in, unsigned long inlen,
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diff changeset
185 unsigned char *out, unsigned long *outlen)
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diff changeset
186 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
187 return _base64_decode_internal(in, inlen, out, outlen, map_base64url, strict);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
188 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
189 #endif /* LTC_BASE64_URL */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
190
285
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parents:
diff changeset
191 #endif
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diff changeset
192
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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diff changeset
193
1471
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diff changeset
194 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
195 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
196 /* commit time: $Format:%ai$ */