Mercurial > dropbear
view libtomcrypt/src/pk/ecc/ecc_ansi_x963_import.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> |
---|---|
date | Mon, 09 Jul 2018 16:27:53 +0200 |
parents | 6dba84798cd5 |
children |
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. */ /* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b * * All curves taken from NIST recommendation paper of July 1999 * Available at http://csrc.nist.gov/cryptval/dss.htm */ #include "tomcrypt.h" /** @file ecc_ansi_x963_import.c ECC Crypto, Tom St Denis */ #ifdef LTC_MECC /** Import an ANSI X9.63 format public key @param in The input data to read @param inlen The length of the input data @param key [out] destination to store imported key \ */ int ecc_ansi_x963_import(const unsigned char *in, unsigned long inlen, ecc_key *key) { return ecc_ansi_x963_import_ex(in, inlen, key, NULL); } int ecc_ansi_x963_import_ex(const unsigned char *in, unsigned long inlen, ecc_key *key, ltc_ecc_set_type *dp) { int x, err; LTC_ARGCHK(in != NULL); LTC_ARGCHK(key != NULL); /* must be odd */ if ((inlen & 1) == 0) { return CRYPT_INVALID_ARG; } /* init key */ if (mp_init_multi(&key->pubkey.x, &key->pubkey.y, &key->pubkey.z, &key->k, NULL) != CRYPT_OK) { return CRYPT_MEM; } /* check for 4, 6 or 7 */ if (in[0] != 4 && in[0] != 6 && in[0] != 7) { err = CRYPT_INVALID_PACKET; goto error; } /* read data */ if ((err = mp_read_unsigned_bin(key->pubkey.x, (unsigned char *)in+1, (inlen-1)>>1)) != CRYPT_OK) { goto error; } if ((err = mp_read_unsigned_bin(key->pubkey.y, (unsigned char *)in+1+((inlen-1)>>1), (inlen-1)>>1)) != CRYPT_OK) { goto error; } if ((err = mp_set(key->pubkey.z, 1)) != CRYPT_OK) { goto error; } if (dp == NULL) { /* determine the idx */ for (x = 0; ltc_ecc_sets[x].size != 0; x++) { if ((unsigned)ltc_ecc_sets[x].size >= ((inlen-1)>>1)) { break; } } if (ltc_ecc_sets[x].size == 0) { err = CRYPT_INVALID_PACKET; goto error; } /* set the idx */ key->idx = x; key->dp = <c_ecc_sets[x]; } else { if (((inlen-1)>>1) != (unsigned long) dp->size) { err = CRYPT_INVALID_PACKET; goto error; } key->idx = -1; key->dp = dp; } key->type = PK_PUBLIC; /* we're done */ return CRYPT_OK; error: mp_clear_multi(key->pubkey.x, key->pubkey.y, key->pubkey.z, key->k, NULL); return err; } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */