Mercurial > dropbear

annotate libtomcrypt/src/modes/lrw/lrw_start.c @ 1930:299f4f19ba19

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Add /usr/sbin and /sbin to default root PATH When dropbear is used in a very restricted environment (such as in a initrd), the default user shell is often also very restricted and doesn't take care of setting the PATH so the user ends up with the PATH set by dropbear. Unfortunately, dropbear always sets "/usr/bin:/bin" as default PATH even for the root user which should have /usr/sbin and /sbin too. For a concrete instance of this problem, see the "Remote Unlocking" section in this tutorial: https://paxswill.com/blog/2013/11/04/encrypted-raspberry-pi/ It speaks of a bug in the initramfs script because it's written "blkid" instead of "/sbin/blkid"... this is just because the scripts from the initramfs do not expect to have a PATH without the sbin directories and because dropbear is not setting the PATH appropriately for the root user. I'm thus suggesting to use the attached patch to fix this misbehaviour (I did not test it, but it's easy enough). It might seem anecdotic but multiple Kali users have been bitten by this. From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903403
author Raphael Hertzog <hertzog@debian.org>
date Mon, 09 Jul 2018 16:27:53 +0200
parents 6dba84798cd5
children
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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 lrw_start.c
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13 LRW_MODE implementation, start mode, Tom St Denis
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14 */
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15
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16 #ifdef LTC_LRW_MODE
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17
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18 /**
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19 Initialize the LRW context
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20 @param cipher The cipher desired, must be a 128-bit block cipher
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21 @param IV The index value, must be 128-bits
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22 @param key The cipher key
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23 @param keylen The length of the cipher key in octets
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24 @param tweak The tweak value (second key), must be 128-bits
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25 @param num_rounds The number of rounds for the cipher (0 == default)
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26 @param lrw [out] The LRW state
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27 @return CRYPT_OK on success.
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28 */
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29 int lrw_start( int cipher,
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30 const unsigned char *IV,
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31 const unsigned char *key, int keylen,
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32 const unsigned char *tweak,
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33 int num_rounds,
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34 symmetric_LRW *lrw)
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35 {
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36 int err;
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37 #ifdef LTC_LRW_TABLES
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38 unsigned char B[16];
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39 int x, y, z, t;
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40 #endif
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41
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42 LTC_ARGCHK(IV != NULL);
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43 LTC_ARGCHK(key != NULL);
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44 LTC_ARGCHK(tweak != NULL);
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45 LTC_ARGCHK(lrw != NULL);
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46
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47 #ifdef LTC_FAST
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48 if (16 % sizeof(LTC_FAST_TYPE)) {
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49 return CRYPT_INVALID_ARG;
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50 }
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51 #endif
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52
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53 /* is cipher valid? */
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54 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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55 return err;
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56 }
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57 if (cipher_descriptor[cipher].block_length != 16) {
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58 return CRYPT_INVALID_CIPHER;
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59 }
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60
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61 /* schedule key */
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62 if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &lrw->key)) != CRYPT_OK) {
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63 return err;
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64 }
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65 lrw->cipher = cipher;
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66
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67 /* copy the IV and tweak */
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68 XMEMCPY(lrw->tweak, tweak, 16);
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69
1471
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70 #ifdef LTC_LRW_TABLES
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71 /* setup tables */
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72 /* generate the first table as it has no shifting (from which we make the other tables) */
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73 zeromem(B, 16);
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74 for (y = 0; y < 256; y++) {
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75 B[0] = y;
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76 gcm_gf_mult(tweak, B, &lrw->PC[0][y][0]);
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77 }
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78
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79 /* now generate the rest of the tables based the previous table */
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80 for (x = 1; x < 16; x++) {
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81 for (y = 0; y < 256; y++) {
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82 /* now shift it right by 8 bits */
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83 t = lrw->PC[x-1][y][15];
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84 for (z = 15; z > 0; z--) {
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85 lrw->PC[x][y][z] = lrw->PC[x-1][y][z-1];
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86 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 lrw->PC[x][y][0] = gcm_shift_table[t<<1];
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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88 lrw->PC[x][y][1] ^= gcm_shift_table[(t<<1)+1];
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parents: 1435
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89 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
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90 }
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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92
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 /* generate first pad */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 return lrw_setiv(IV, 16, lrw);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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95 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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96
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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97
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 #endif
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parents: 1435
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99 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
100 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
101 /* commit time: $Format:%ai$ */