Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/utf8/der_decode_utf8_string.c @ 1634:aabde6f57fce

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Add a sanity check for DROPBEAR_SVR_MULTIUSER==0 mode
author Matt Johnston <matt@ucc.asn.au>
date Wed, 20 Mar 2019 22:57:06 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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diff changeset
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_utf8_string.c
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13 ASN.1 DER, encode a UTF8 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 UTF8 STRING
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21 @param in The DER encoded UTF8 STRING
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22 @param inlen The size of the DER UTF8 STRING
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23 @param out [out] The array of utf8s stored (one per char)
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24 @param outlen [in/out] The number of utf8s stored
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25 @return CRYPT_OK if successful
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26 */
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27 int der_decode_utf8_string(const unsigned char *in, unsigned long inlen,
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28 wchar_t *out, unsigned long *outlen)
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29 {
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30 wchar_t tmp;
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31 unsigned long x, y, z, len;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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32 int err;
382
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33
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34 LTC_ARGCHK(in != NULL);
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35 LTC_ARGCHK(out != NULL);
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36 LTC_ARGCHK(outlen != NULL);
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37
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38 /* must have header at least */
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39 if (inlen < 2) {
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40 return CRYPT_INVALID_PACKET;
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41 }
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42
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43 /* check for 0x0C */
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44 if ((in[0] & 0x1F) != 0x0C) {
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45 return CRYPT_INVALID_PACKET;
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46 }
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47 x = 1;
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48
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49 /* decode the length */
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50 if (in[x] & 0x80) {
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51 /* valid # of bytes in length are 1,2,3 */
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52 y = in[x] & 0x7F;
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53 if ((y == 0) || (y > 3) || ((x + y) > inlen)) {
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54 return CRYPT_INVALID_PACKET;
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55 }
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56
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57 /* read the length in */
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58 len = 0;
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59 ++x;
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60 while (y--) {
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61 len = (len << 8) | in[x++];
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62 }
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63 } else {
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64 len = in[x++] & 0x7F;
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65 }
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66
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67 if (len + x > inlen) {
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68 return CRYPT_INVALID_PACKET;
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69 }
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70
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71 /* proceed to decode */
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72 for (y = 0; x < inlen; ) {
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73 /* get first byte */
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74 tmp = in[x++];
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
75
382
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76 /* count number of bytes */
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77 for (z = 0; (tmp & 0x80) && (z <= 4); z++, tmp = (tmp << 1) & 0xFF);
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
78
382
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79 if (z > 4 || (x + (z - 1) > inlen)) {
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80 return CRYPT_INVALID_PACKET;
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81 }
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82
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83 /* decode, grab upper bits */
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84 tmp >>= z;
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85
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86 /* grab remaining bytes */
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87 if (z > 1) { --z; }
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diff changeset
88 while (z-- != 0) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 if ((in[x] & 0xC0) != 0x80) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 return CRYPT_INVALID_PACKET;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 tmp = (tmp << 6) | ((wchar_t)in[x++] & 0x3F);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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93 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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parents:
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94
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
95 if (y < *outlen) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
96 out[y] = tmp;
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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parents:
diff changeset
97 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
98 y++;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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99 }
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parents: 1435
diff changeset
100 if (y > *outlen) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
101 err = CRYPT_BUFFER_OVERFLOW;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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102 } else {
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parents: 1435
diff changeset
103 err = CRYPT_OK;
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105 *outlen = y;
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
107 return err;
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
108 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
109
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
110 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
111
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diff changeset
112 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
113 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
114 /* commit time: $Format:%ai$ */