Mercurial > dropbear
view ecdsa.h @ 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 | 99ca393afc56 |
children |
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#ifndef DROPBEAR_ECDSA_H_ #define DROPBEAR_ECDSA_H_ #include "includes.h" #include "buffer.h" #include "signkey.h" #if DROPBEAR_ECDSA /* prefer 256 or 384 since those are SHOULD for draft-ietf-curdle-ssh-kex-sha2.txt */ #if DROPBEAR_ECC_256 #define ECDSA_DEFAULT_SIZE 256 #elif DROPBEAR_ECC_384 #define ECDSA_DEFAULT_SIZE 384 #elif DROPBEAR_ECC_521 #define ECDSA_DEFAULT_SIZE 521 #else #error ECDSA cannot be enabled without enabling at least one size (256, 384, 521) #endif ecc_key *gen_ecdsa_priv_key(unsigned int bit_size); ecc_key *buf_get_ecdsa_pub_key(buffer* buf); ecc_key *buf_get_ecdsa_priv_key(buffer *buf); void buf_put_ecdsa_pub_key(buffer *buf, ecc_key *key); void buf_put_ecdsa_priv_key(buffer *buf, ecc_key *key); enum signkey_type ecdsa_signkey_type(const ecc_key * key); void buf_put_ecdsa_sign(buffer *buf, const ecc_key *key, const buffer *data_buf); int buf_ecdsa_verify(buffer *buf, const ecc_key *key, const buffer *data_buf); /* Returns 1 on success */ int signkey_is_ecdsa(enum signkey_type type); #endif #endif /* DROPBEAR_ECDSA_H_ */