Mercurial > dropbear
view libtomcrypt/src/pk/asn1/der/octet/der_length_octet_string.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 |
line wrap: on
line source
/* 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 der_length_octet_string.c ASN.1 DER, get length of OCTET STRING, Tom St Denis */ #ifdef LTC_DER /** Gets length of DER encoding of OCTET STRING @param noctets The number of octets in the string to encode @param outlen [out] The length of the DER encoding for the given string @return CRYPT_OK if successful */ int der_length_octet_string(unsigned long noctets, unsigned long *outlen) { LTC_ARGCHK(outlen != NULL); if (noctets < 128) { /* 04 LL DD DD DD ... */ *outlen = 2 + noctets; } else if (noctets < 256) { /* 04 81 LL DD DD DD ... */ *outlen = 3 + noctets; } else if (noctets < 65536UL) { /* 04 82 LL LL DD DD DD ... */ *outlen = 4 + noctets; } else if (noctets < 16777216UL) { /* 04 83 LL LL LL DD DD DD ... */ *outlen = 5 + noctets; } else { return CRYPT_INVALID_ARG; } return CRYPT_OK; } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */