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annotate libtomcrypt/src/pk/dsa/dsa_import.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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 dsa_import.c
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13 DSA implementation, import a DSA key, Tom St Denis
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14 */
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15
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16 #ifdef LTC_MDSA
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17
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18 /**
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19 Import a DSA key
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20 @param in The binary packet to import from
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21 @param inlen The length of the binary packet
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22 @param key [out] Where to store the imported key
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23 @return CRYPT_OK if successful, upon error this function will free all allocated memory
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24 */
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25 int dsa_import(const unsigned char *in, unsigned long inlen, dsa_key *key)
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26 {
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27 int err, stat;
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28 unsigned long zero = 0;
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29 unsigned char* tmpbuf = NULL;
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30 unsigned char flags[1];
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31
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32 LTC_ARGCHK(in != NULL);
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33 LTC_ARGCHK(key != NULL);
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34 LTC_ARGCHK(ltc_mp.name != NULL);
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35
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36 /* init key */
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37 if (mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL) != CRYPT_OK) {
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38 return CRYPT_MEM;
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39 }
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40
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41 /* try to match the old libtomcrypt format */
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42 err = der_decode_sequence_multi(in, inlen, LTC_ASN1_BIT_STRING, 1UL, flags,
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43 LTC_ASN1_EOL, 0UL, NULL);
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44
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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45 if (err == CRYPT_OK || err == CRYPT_INPUT_TOO_LONG) {
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46 /* private key */
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47 if (flags[0] == 1) {
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48 if ((err = der_decode_sequence_multi(in, inlen,
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49 LTC_ASN1_BIT_STRING, 1UL, flags,
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50 LTC_ASN1_INTEGER, 1UL, key->g,
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51 LTC_ASN1_INTEGER, 1UL, key->p,
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52 LTC_ASN1_INTEGER, 1UL, key->q,
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53 LTC_ASN1_INTEGER, 1UL, key->y,
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54 LTC_ASN1_INTEGER, 1UL, key->x,
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55 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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56 goto LBL_ERR;
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57 }
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58 key->type = PK_PRIVATE;
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59 goto LBL_OK;
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60 }
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61 /* public key */
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62 else if (flags[0] == 0) {
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63 if ((err = der_decode_sequence_multi(in, inlen,
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64 LTC_ASN1_BIT_STRING, 1UL, flags,
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65 LTC_ASN1_INTEGER, 1UL, key->g,
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66 LTC_ASN1_INTEGER, 1UL, key->p,
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67 LTC_ASN1_INTEGER, 1UL, key->q,
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68 LTC_ASN1_INTEGER, 1UL, key->y,
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69 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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70 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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71 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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72 key->type = PK_PUBLIC;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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73 goto LBL_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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74 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
75 else {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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76 err = CRYPT_INVALID_PACKET;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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77 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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78 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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79 }
285
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80 /* get key type */
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81 if ((err = der_decode_sequence_multi(in, inlen,
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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82 LTC_ASN1_SHORT_INTEGER, 1UL, &zero,
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83 LTC_ASN1_INTEGER, 1UL, key->p,
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84 LTC_ASN1_INTEGER, 1UL, key->q,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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85 LTC_ASN1_INTEGER, 1UL, key->g,
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diff changeset
86 LTC_ASN1_INTEGER, 1UL, key->y,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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87 LTC_ASN1_INTEGER, 1UL, key->x,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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88 LTC_ASN1_EOL, 0UL, NULL)) == CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
89
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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90 key->type = PK_PRIVATE;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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91 } else { /* public */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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92 ltc_asn1_list params[3];
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93 unsigned long tmpbuf_len = inlen;
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diff changeset
94
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
95 LTC_SET_ASN1(params, 0, LTC_ASN1_INTEGER, key->p, 1UL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
96 LTC_SET_ASN1(params, 1, LTC_ASN1_INTEGER, key->q, 1UL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
97 LTC_SET_ASN1(params, 2, LTC_ASN1_INTEGER, key->g, 1UL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
98
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
99 tmpbuf = XCALLOC(1, tmpbuf_len);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
100 if (tmpbuf == NULL) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
101 err = CRYPT_MEM;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
102 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
103 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
104
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
105 err = der_decode_subject_public_key_info(in, inlen, PKA_DSA,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
106 tmpbuf, &tmpbuf_len,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
107 LTC_ASN1_SEQUENCE, params, 3);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
108 if (err != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
109 XFREE(tmpbuf);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
110 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
111 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
112
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
113 if ((err=der_decode_integer(tmpbuf, tmpbuf_len, key->y)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
114 XFREE(tmpbuf);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
115 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
116 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
117
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
118 XFREE(tmpbuf);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
119 key->type = PK_PUBLIC;
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
120 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
121
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
122 LBL_OK:
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
123 key->qord = mp_unsigned_bin_size(key->q);
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
124
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
125 /* quick p, q, g validation, without primality testing */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
126 if ((err = dsa_int_validate_pqg(key, &stat)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
127 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
128 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
129 if (stat == 0) {
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
130 err = CRYPT_INVALID_PACKET;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
131 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
132 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
133 /* validate x, y */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
134 if ((err = dsa_int_validate_xy(key, &stat)) != CRYPT_OK) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
135 goto LBL_ERR;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
136 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
137 if (stat == 0) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
138 err = CRYPT_INVALID_PACKET;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
139 goto LBL_ERR;
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
140 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
141
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
142 return CRYPT_OK;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
143 LBL_ERR:
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
144 dsa_free(key);
285
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
145 return err;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
146 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
147
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
148 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
149
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
150 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
151 /* 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
152 /* commit time: $Format:%ai$ */