Mercurial > dropbear
annotate libtomcrypt/src/pk/asn1/der/bit/der_decode_bit_string.c @ 1851:7f549ee3df48
Use HOME before /etc/passwd to find id_dropbear (#137)
Currently dbclient uses the value of HOME by default when looking for
~/.ssh/known_hosts, falling back to /etc/passwd if HOME is not set (so
that people can work around broken values in /etc/passwd).
However, when locating the default authentication key (defaults to
~/.ssh/id_dropbear), paths not starting with / are always prefixed with
the value from /etc/passwd.
Make the behaviour consistent by adjusting expand_homedir_path to use
the value of HOME, falling back to /etc/passwd if HOME is not set.
author | Matt Robinson <git@nerdoftheherd.com> |
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date | Tue, 19 Oct 2021 06:02:47 +0100 |
parents | 6dba84798cd5 |
children |
rev | line source |
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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 der_decode_bit_string.c |
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13 ASN.1 DER, encode a BIT 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 BIT STRING |
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21 @param in The DER encoded BIT STRING |
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22 @param inlen The size of the DER BIT STRING |
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23 @param out [out] The array of bits stored (one per char) |
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24 @param outlen [in/out] The number of bits stored |
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25 @return CRYPT_OK if successful |
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26 */ |
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27 int der_decode_bit_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 dlen, blen, x, y; |
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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 /* packet must be at least 4 bytes */ |
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37 if (inlen < 4) { |
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38 return CRYPT_INVALID_ARG; |
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39 } |
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40 |
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41 /* check for 0x03 */ |
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42 if ((in[0]&0x1F) != 0x03) { |
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43 return CRYPT_INVALID_PACKET; |
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44 } |
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45 |
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46 /* offset in the data */ |
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47 x = 1; |
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48 |
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49 /* get the length of the data */ |
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50 if (in[x] & 0x80) { |
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51 /* long format get number of length bytes */ |
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52 y = in[x++] & 0x7F; |
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53 |
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54 /* invalid if 0 or > 2 */ |
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55 if (y == 0 || y > 2) { |
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56 return CRYPT_INVALID_PACKET; |
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57 } |
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58 |
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59 /* read the data len */ |
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60 dlen = 0; |
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61 while (y--) { |
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62 dlen = (dlen << 8) | (unsigned long)in[x++]; |
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63 } |
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64 } else { |
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65 /* short format */ |
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66 dlen = in[x++] & 0x7F; |
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67 } |
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68 |
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69 /* is the data len too long or too short? */ |
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70 if ((dlen == 0) || (dlen + x > inlen)) { |
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71 return CRYPT_INVALID_PACKET; |
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72 } |
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73 |
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74 /* get padding count */ |
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75 blen = ((dlen - 1) << 3) - (in[x++] & 7); |
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76 |
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77 /* too many bits? */ |
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78 if (blen > *outlen) { |
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79 *outlen = blen; |
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80 return CRYPT_BUFFER_OVERFLOW; |
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81 } |
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82 |
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83 /* decode/store the bits */ |
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84 for (y = 0; y < blen; y++) { |
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85 out[y] = (in[x] & (1 << (7 - (y & 7)))) ? 1 : 0; |
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86 if ((y & 7) == 7) { |
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87 ++x; |
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88 } |
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89 } |
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90 |
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91 /* we done */ |
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92 *outlen = blen; |
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93 return CRYPT_OK; |
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94 } |
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95 |
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96 #endif |
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97 |
1471
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98 /* ref: $Format:%D$ */ |
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99 /* git commit: $Format:%H$ */ |
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100 /* commit time: $Format:%ai$ */ |