Mercurial > dropbear
annotate libtomcrypt/src/pk/ecc/ecc_make_key.c @ 1930:299f4f19ba19
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> |
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date | Mon, 09 Jul 2018 16:27:53 +0200 |
parents | 6dba84798cd5 |
children |
rev | line source |
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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 /* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b |
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11 * |
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12 * All curves taken from NIST recommendation paper of July 1999 |
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13 * Available at http://csrc.nist.gov/cryptval/dss.htm |
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14 */ |
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15 #include "tomcrypt.h" |
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16 |
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17 /** |
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18 @file ecc_make_key.c |
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19 ECC Crypto, Tom St Denis |
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20 */ |
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21 |
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22 #ifdef LTC_MECC |
382
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23 |
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24 /** |
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25 Make a new ECC key |
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26 @param prng An active PRNG state |
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27 @param wprng The index of the PRNG you wish to use |
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28 @param keysize The keysize for the new key (in octets from 20 to 65 bytes) |
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29 @param key [out] Destination of the newly created key |
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30 @return CRYPT_OK if successful, upon error all allocated memory will be freed |
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31 */ |
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32 int ecc_make_key(prng_state *prng, int wprng, int keysize, ecc_key *key) |
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33 { |
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34 int x, err; |
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35 |
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36 /* find key size */ |
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37 for (x = 0; (keysize > ltc_ecc_sets[x].size) && (ltc_ecc_sets[x].size != 0); x++); |
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38 keysize = ltc_ecc_sets[x].size; |
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39 |
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40 if (keysize > ECC_MAXSIZE || ltc_ecc_sets[x].size == 0) { |
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41 return CRYPT_INVALID_KEYSIZE; |
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42 } |
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43 err = ecc_make_key_ex(prng, wprng, key, <c_ecc_sets[x]); |
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44 key->idx = x; |
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45 return err; |
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46 } |
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47 |
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48 int ecc_make_key_ex(prng_state *prng, int wprng, ecc_key *key, const ltc_ecc_set_type *dp) |
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49 { |
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50 int err; |
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51 ecc_point *base; |
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52 void *prime, *order; |
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53 unsigned char *buf; |
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54 int keysize; |
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55 |
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56 LTC_ARGCHK(key != NULL); |
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57 LTC_ARGCHK(ltc_mp.name != NULL); |
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58 LTC_ARGCHK(dp != NULL); |
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59 |
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60 /* good prng? */ |
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61 if ((err = prng_is_valid(wprng)) != CRYPT_OK) { |
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62 return err; |
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63 } |
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64 |
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65 key->idx = -1; |
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66 key->dp = dp; |
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67 keysize = dp->size; |
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68 |
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69 /* allocate ram */ |
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70 base = NULL; |
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71 buf = XMALLOC(ECC_MAXSIZE); |
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72 if (buf == NULL) { |
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73 return CRYPT_MEM; |
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74 } |
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75 |
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76 /* make up random string */ |
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77 if (prng_descriptor[wprng].read(buf, (unsigned long)keysize, prng) != (unsigned long)keysize) { |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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78 err = CRYPT_ERROR_READPRNG; |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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diff
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79 goto ERR_BUF; |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
80 } |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
81 |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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diff
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82 /* setup the key variables */ |
1435
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update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
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382
diff
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83 if ((err = mp_init_multi(&key->pubkey.x, &key->pubkey.y, &key->pubkey.z, &key->k, &prime, &order, NULL)) != CRYPT_OK) { |
382
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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84 goto ERR_BUF; |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
85 } |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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86 base = ltc_ecc_new_point(); |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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87 if (base == NULL) { |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
88 err = CRYPT_MEM; |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
89 goto errkey; |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
90 } |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
91 |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
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|
92 /* read in the specs for this key */ |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
93 if ((err = mp_read_radix(prime, (char *)key->dp->prime, 16)) != CRYPT_OK) { goto errkey; } |
1435
f849a5ca2efc
update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
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382
diff
changeset
|
94 if ((err = mp_read_radix(order, (char *)key->dp->order, 16)) != CRYPT_OK) { goto errkey; } |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
95 if ((err = mp_read_radix(base->x, (char *)key->dp->Gx, 16)) != CRYPT_OK) { goto errkey; } |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
96 if ((err = mp_read_radix(base->y, (char *)key->dp->Gy, 16)) != CRYPT_OK) { goto errkey; } |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
97 if ((err = mp_set(base->z, 1)) != CRYPT_OK) { goto errkey; } |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
98 if ((err = mp_read_unsigned_bin(key->k, (unsigned char *)buf, keysize)) != CRYPT_OK) { goto errkey; } |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
99 |
1435
f849a5ca2efc
update to libtomcrypt 1.17 (with Dropbear changes)
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382
diff
changeset
|
100 /* the key should be smaller than the order of base point */ |
f849a5ca2efc
update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents:
382
diff
changeset
|
101 if (mp_cmp(key->k, order) != LTC_MP_LT) { |
f849a5ca2efc
update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents:
382
diff
changeset
|
102 if((err = mp_mod(key->k, order, key->k)) != CRYPT_OK) { goto errkey; } |
f849a5ca2efc
update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents:
382
diff
changeset
|
103 } |
382
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
104 /* make the public key */ |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
105 if ((err = ltc_mp.ecc_ptmul(key->k, base, &key->pubkey, prime, 1)) != CRYPT_OK) { goto errkey; } |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
106 key->type = PK_PRIVATE; |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
107 |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
108 /* free up ram */ |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
109 err = CRYPT_OK; |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
110 goto cleanup; |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
111 errkey: |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
112 mp_clear_multi(key->pubkey.x, key->pubkey.y, key->pubkey.z, key->k, NULL); |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
113 cleanup: |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
114 ltc_ecc_del_point(base); |
1435
f849a5ca2efc
update to libtomcrypt 1.17 (with Dropbear changes)
Matt Johnston <matt@ucc.asn.au>
parents:
382
diff
changeset
|
115 mp_clear_multi(prime, order, NULL); |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
116 ERR_BUF: |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
117 #ifdef LTC_CLEAN_STACK |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
118 zeromem(buf, ECC_MAXSIZE); |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
119 #endif |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
120 XFREE(buf); |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
121 return err; |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
122 } |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
123 |
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
124 #endif |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
125 /* ref: $Format:%D$ */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
126 /* 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
|
127 /* commit time: $Format:%ai$ */ |
382
0cbe8f6dbf9e
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
128 |