Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_memory.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
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10 /**
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11 @file gcm_memory.c
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12 GCM implementation, process a packet, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
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16 #ifdef LTC_GCM_MODE
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18 /**
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19 Process an entire GCM packet in one call.
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20 @param cipher Index of cipher to use
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21 @param key The secret key
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22 @param keylen The length of the secret key
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23 @param IV The initialization vector
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24 @param IVlen The length of the initialization vector
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25 @param adata The additional authentication data (header)
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26 @param adatalen The length of the adata
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27 @param pt The plaintext
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28 @param ptlen The length of the plaintext (ciphertext length is the same)
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29 @param ct The ciphertext
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30 @param tag [out] The MAC tag
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31 @param taglen [in/out] The MAC tag length
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32 @param direction Encrypt or Decrypt mode (GCM_ENCRYPT or GCM_DECRYPT)
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33 @return CRYPT_OK on success
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34 */
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35 int gcm_memory( int cipher,
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36 const unsigned char *key, unsigned long keylen,
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37 const unsigned char *IV, unsigned long IVlen,
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38 const unsigned char *adata, unsigned long adatalen,
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39 unsigned char *pt, unsigned long ptlen,
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40 unsigned char *ct,
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41 unsigned char *tag, unsigned long *taglen,
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42 int direction)
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43 {
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44 void *orig;
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45 gcm_state *gcm;
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46 int err;
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47
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48 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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49 return err;
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50 }
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51
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52 if (cipher_descriptor[cipher].accel_gcm_memory != NULL) {
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53 return cipher_descriptor[cipher].accel_gcm_memory
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54 (key, keylen,
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55 IV, IVlen,
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56 adata, adatalen,
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57 pt, ptlen,
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58 ct,
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59 tag, taglen,
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60 direction);
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61 }
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62
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63
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64
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65 #ifndef LTC_GCM_TABLES_SSE2
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66 orig = gcm = XMALLOC(sizeof(*gcm));
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67 #else
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68 orig = gcm = XMALLOC(sizeof(*gcm) + 16);
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69 #endif
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70 if (gcm == NULL) {
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71 return CRYPT_MEM;
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72 }
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73
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74 /* Force GCM to be on a multiple of 16 so we can use 128-bit aligned operations
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75 * note that we only modify gcm and keep orig intact. This code is not portable
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76 * but again it's only for SSE2 anyways, so who cares?
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77 */
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78 #ifdef LTC_GCM_TABLES_SSE2
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79 if ((unsigned long)gcm & 15) {
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80 gcm = (gcm_state *)((unsigned long)gcm + (16 - ((unsigned long)gcm & 15)));
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81 }
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82 #endif
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83
285
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84 if ((err = gcm_init(gcm, cipher, key, keylen)) != CRYPT_OK) {
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85 goto LTC_ERR;
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86 }
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87 if ((err = gcm_add_iv(gcm, IV, IVlen)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 goto LTC_ERR;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 if ((err = gcm_add_aad(gcm, adata, adatalen)) != CRYPT_OK) {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 goto LTC_ERR;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 if ((err = gcm_process(gcm, pt, ptlen, ct, direction)) != CRYPT_OK) {
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 goto LTC_ERR;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 err = gcm_done(gcm, tag, taglen);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 LTC_ERR:
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
98 XFREE(orig);
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 return err;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
104 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
105 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
106 /* commit time: $Format:%ai$ */