Mercurial > dropbear

annotate libtomcrypt/src/pk/pkcs1/pkcs_1_mgf1.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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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11 /**
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12 @file pkcs_1_mgf1.c
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13 The Mask Generation Function (MGF1) for PKCS #1, Tom St Denis
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14 */
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15
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16 #ifdef LTC_PKCS_1
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18 /**
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19 Perform PKCS #1 MGF1 (internal)
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20 @param hash_idx The index of the hash desired
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21 @param seed The seed for MGF1
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22 @param seedlen The length of the seed
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23 @param mask [out] The destination
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24 @param masklen The length of the mask desired
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25 @return CRYPT_OK if successful
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26 */
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27 int pkcs_1_mgf1(int hash_idx,
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28 const unsigned char *seed, unsigned long seedlen,
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29 unsigned char *mask, unsigned long masklen)
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30 {
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31 unsigned long hLen, x;
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32 ulong32 counter;
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33 int err;
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34 hash_state *md;
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35 unsigned char *buf;
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36
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37 LTC_ARGCHK(seed != NULL);
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38 LTC_ARGCHK(mask != NULL);
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40 /* ensure valid hash */
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41 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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42 return err;
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43 }
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45 /* get hash output size */
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46 hLen = hash_descriptor[hash_idx].hashsize;
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47
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48 /* allocate memory */
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49 md = XMALLOC(sizeof(hash_state));
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50 buf = XMALLOC(hLen);
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51 if (md == NULL || buf == NULL) {
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52 if (md != NULL) {
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53 XFREE(md);
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54 }
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55 if (buf != NULL) {
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56 XFREE(buf);
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57 }
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58 return CRYPT_MEM;
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59 }
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60
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61 /* start counter */
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62 counter = 0;
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63
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64 while (masklen > 0) {
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65 /* handle counter */
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66 STORE32H(counter, buf);
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67 ++counter;
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68
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69 /* get hash of seed || counter */
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70 if ((err = hash_descriptor[hash_idx].init(md)) != CRYPT_OK) {
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71 goto LBL_ERR;
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72 }
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73 if ((err = hash_descriptor[hash_idx].process(md, seed, seedlen)) != CRYPT_OK) {
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74 goto LBL_ERR;
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75 }
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76 if ((err = hash_descriptor[hash_idx].process(md, buf, 4)) != CRYPT_OK) {
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77 goto LBL_ERR;
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78 }
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79 if ((err = hash_descriptor[hash_idx].done(md, buf)) != CRYPT_OK) {
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80 goto LBL_ERR;
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81 }
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82
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83 /* store it */
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84 for (x = 0; x < hLen && masklen > 0; x++, masklen--) {
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85 *mask++ = buf[x];
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86 }
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87 }
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88
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diff changeset
89 err = CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 LBL_ERR:
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 #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
92 zeromem(buf, hLen);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 zeromem(md, sizeof(hash_state));
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 #endif
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 XFREE(buf);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 XFREE(md);
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 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
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents: 382
diff changeset
102 #endif /* LTC_PKCS_1 */
285
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: $Format:%ai$ */