Mercurial > dropbear

annotate libtomcrypt/src/encauth/eax/eax_decrypt_verify_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 eax_decrypt_verify_memory.c
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12 EAX implementation, decrypt block of memory, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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16 #ifdef LTC_EAX_MODE
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17
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18 /**
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19 Decrypt a block of memory and verify the provided MAC tag with EAX
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20 @param cipher The index of the cipher desired
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21 @param key The secret key
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22 @param keylen The length of the key (octets)
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23 @param nonce The nonce data (use once) for the session
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24 @param noncelen The length of the nonce data.
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25 @param header The session header data
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26 @param headerlen The length of the header (octets)
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27 @param ct The ciphertext
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28 @param ctlen The length of the ciphertext (octets)
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29 @param pt [out] The plaintext
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30 @param tag The authentication tag provided by the encoder
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31 @param taglen [in/out] The length of the tag (octets)
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32 @param stat [out] The result of the decryption (1==valid tag, 0==invalid)
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33 @return CRYPT_OK if successful regardless of the resulting tag comparison
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34 */
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35 int eax_decrypt_verify_memory(int cipher,
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36 const unsigned char *key, unsigned long keylen,
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37 const unsigned char *nonce, unsigned long noncelen,
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38 const unsigned char *header, unsigned long headerlen,
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39 const unsigned char *ct, unsigned long ctlen,
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40 unsigned char *pt,
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41 unsigned char *tag, unsigned long taglen,
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42 int *stat)
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43 {
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44 int err;
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45 eax_state *eax;
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46 unsigned char *buf;
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47 unsigned long buflen;
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48
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49 LTC_ARGCHK(stat != NULL);
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50 LTC_ARGCHK(key != NULL);
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51 LTC_ARGCHK(pt != NULL);
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52 LTC_ARGCHK(ct != NULL);
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53 LTC_ARGCHK(tag != NULL);
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54
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55 /* default to zero */
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56 *stat = 0;
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57
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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58 /* limit taglen */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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59 taglen = MIN(taglen, MAXBLOCKSIZE);
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60
285
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61 /* allocate ram */
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62 buf = XMALLOC(taglen);
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63 eax = XMALLOC(sizeof(*eax));
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64 if (eax == NULL || buf == NULL) {
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65 if (eax != NULL) {
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66 XFREE(eax);
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67 }
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68 if (buf != NULL) {
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69 XFREE(buf);
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70 }
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71 return CRYPT_MEM;
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72 }
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73
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74 if ((err = eax_init(eax, cipher, key, keylen, nonce, noncelen, header, headerlen)) != CRYPT_OK) {
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75 goto LBL_ERR;
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76 }
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77
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78 if ((err = eax_decrypt(eax, ct, pt, ctlen)) != CRYPT_OK) {
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79 goto LBL_ERR;
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80 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
81
285
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82 buflen = taglen;
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83 if ((err = eax_done(eax, buf, &buflen)) != CRYPT_OK) {
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84 goto LBL_ERR;
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85 }
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86
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87 /* compare tags */
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
88 if (buflen >= taglen && XMEM_NEQ(buf, tag, taglen) == 0) {
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 *stat = 1;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
91
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 err = CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 LBL_ERR:
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 #ifdef LTC_CLEAN_STACK
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 zeromem(buf, taglen);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 zeromem(eax, sizeof(*eax));
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 XFREE(eax);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 XFREE(buf);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 return err;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
107 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
108 /* 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
109 /* commit time: $Format:%ai$ */