Mercurial > dropbear
view libtomcrypt/src/encauth/ocb3/ocb3_encrypt_authenticate_memory.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. */ /** @file ocb3_encrypt_authenticate_memory.c OCB implementation, encrypt block of memory, by Tom St Denis */ #include "tomcrypt.h" #ifdef LTC_OCB3_MODE /** Encrypt and generate an authentication code for a buffer of memory @param cipher The index of the cipher desired @param key The secret key @param keylen The length of the secret key (octets) @param nonce The session nonce (length of the block ciphers block size) @param noncelen The length of the nonce (octets) @param adata The AAD - additional associated data @param adatalen The length of AAD (octets) @param pt The plaintext @param ptlen The length of the plaintext (octets) @param ct [out] The ciphertext @param tag [out] The authentication tag @param taglen [in/out] The max size and resulting size of the authentication tag @return CRYPT_OK if successful */ int ocb3_encrypt_authenticate_memory(int cipher, const unsigned char *key, unsigned long keylen, const unsigned char *nonce, unsigned long noncelen, const unsigned char *adata, unsigned long adatalen, const unsigned char *pt, unsigned long ptlen, unsigned char *ct, unsigned char *tag, unsigned long *taglen) { int err; ocb3_state *ocb; LTC_ARGCHK(taglen != NULL); /* allocate memory */ ocb = XMALLOC(sizeof(ocb3_state)); if (ocb == NULL) { return CRYPT_MEM; } if ((err = ocb3_init(ocb, cipher, key, keylen, nonce, noncelen, *taglen)) != CRYPT_OK) { goto LBL_ERR; } if (adata != NULL || adatalen != 0) { if ((err = ocb3_add_aad(ocb, adata, adatalen)) != CRYPT_OK) { goto LBL_ERR; } } if ((err = ocb3_encrypt_last(ocb, pt, ptlen, ct)) != CRYPT_OK) { goto LBL_ERR; } err = ocb3_done(ocb, tag, taglen); LBL_ERR: #ifdef LTC_CLEAN_STACK zeromem(ocb, sizeof(ocb3_state)); #endif XFREE(ocb); return err; } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */