Mercurial > dropbear
view libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.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. */ #include "tomcrypt.h" /** @file pkcs_1_i2osp.c Integer to Octet I2OSP, Tom St Denis */ #ifdef LTC_PKCS_1 /* always stores the same # of bytes, pads with leading zero bytes as required */ /** PKCS #1 Integer to binary @param n The integer to store @param modulus_len The length of the RSA modulus @param out [out] The destination for the integer @return CRYPT_OK if successful */ int pkcs_1_i2osp(void *n, unsigned long modulus_len, unsigned char *out) { unsigned long size; size = mp_unsigned_bin_size(n); if (size > modulus_len) { return CRYPT_BUFFER_OVERFLOW; } /* store it */ zeromem(out, modulus_len); return mp_to_unsigned_bin(n, out+(modulus_len-size)); } #endif /* LTC_PKCS_1 */ /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */