Mercurial > dropbear

annotate libtomcrypt/src/pk/katja/katja_encrypt_key.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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11 /**
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12 @file katja_encrypt_key.c
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13 Katja PKCS-style OAEP encryption, Tom St Denis
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14 */
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15
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16 #ifdef LTC_MKAT
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18 /**
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19 (PKCS #1 v2.0) OAEP pad then encrypt
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20 @param in The plaintext
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21 @param inlen The length of the plaintext (octets)
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22 @param out [out] The ciphertext
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23 @param outlen [in/out] The max size and resulting size of the ciphertext
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24 @param lparam The system "lparam" for the encryption
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25 @param lparamlen The length of lparam (octets)
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26 @param prng An active PRNG
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27 @param prng_idx The index of the desired prng
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28 @param hash_idx The index of the desired hash
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29 @param key The Katja key to encrypt to
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30 @return CRYPT_OK if successful
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31 */
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32 int katja_encrypt_key(const unsigned char *in, unsigned long inlen,
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33 unsigned char *out, unsigned long *outlen,
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34 const unsigned char *lparam, unsigned long lparamlen,
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35 prng_state *prng, int prng_idx, int hash_idx, katja_key *key)
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36 {
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37 unsigned long modulus_bitlen, modulus_bytelen, x;
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38 int err;
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39
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40 LTC_ARGCHK(in != NULL);
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41 LTC_ARGCHK(out != NULL);
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42 LTC_ARGCHK(outlen != NULL);
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43 LTC_ARGCHK(key != NULL);
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44
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45 /* valid prng and hash ? */
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46 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
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47 return err;
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48 }
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49 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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50 return err;
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51 }
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52
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53 /* get modulus len in bits */
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54 modulus_bitlen = mp_count_bits((key->N));
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55
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56 /* payload is upto pq, so we know q is 1/3rd the size of N and therefore pq is 2/3th the size */
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57 modulus_bitlen = ((modulus_bitlen << 1) / 3);
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58
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59 /* round down to next byte */
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60 modulus_bitlen -= (modulus_bitlen & 7) + 8;
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61
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62 /* outlen must be at least the size of the modulus */
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63 modulus_bytelen = mp_unsigned_bin_size((key->N));
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64 if (modulus_bytelen > *outlen) {
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65 *outlen = modulus_bytelen;
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66 return CRYPT_BUFFER_OVERFLOW;
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67 }
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68
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69 /* OAEP pad the key */
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70 x = *outlen;
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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71 if ((err = pkcs_1_oaep_encode(in, inlen, lparam,
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72 lparamlen, modulus_bitlen, prng, prng_idx, hash_idx,
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73 out, &x)) != CRYPT_OK) {
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74 return err;
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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75 }
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76
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77 /* Katja exptmod the OAEP pad */
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78 return katja_exptmod(out, x, out, outlen, PK_PUBLIC, key);
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79 }
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80
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81 #endif /* LTC_MRSA */
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82
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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83 /* ref: $Format:%D$ */
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84 /* git commit: $Format:%H$ */
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85 /* commit time: $Format:%ai$ */