Mercurial > dropbear
view libtomcrypt/tests/modes_test.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. */ /* test CFB/OFB/CBC modes */ #include <tomcrypt_test.h> int modes_test(void) { int ret = CRYPT_NOP; #ifdef LTC_CBC_MODE symmetric_CBC cbc; #endif #ifdef LTC_CFB_MODE symmetric_CFB cfb; #endif #ifdef LTC_OFB_MODE symmetric_OFB ofb; #endif #if defined(LTC_CBC_MODE) || defined(LTC_CFB_MODE) || defined(LTC_OFB_MODE) unsigned char pt[64], ct[64], tmp[64], key[16], iv[16], iv2[16]; int cipher_idx; unsigned long l; /* make a random pt, key and iv */ yarrow_read(pt, 64, &yarrow_prng); yarrow_read(key, 16, &yarrow_prng); yarrow_read(iv, 16, &yarrow_prng); /* get idx of AES handy */ cipher_idx = find_cipher("aes"); if (cipher_idx == -1) { fprintf(stderr, "test requires AES"); return 1; } #endif #ifdef LTC_F8_MODE DO(ret = f8_test_mode()); #endif #ifdef LTC_LRW_MODE DO(ret = lrw_test()); #endif #ifdef LTC_CBC_MODE /* test CBC mode */ /* encode the block */ DO(ret = cbc_start(cipher_idx, iv, key, 16, 0, &cbc)); l = sizeof(iv2); DO(ret = cbc_getiv(iv2, &l, &cbc)); if (l != 16 || memcmp(iv2, iv, 16)) { fprintf(stderr, "cbc_getiv failed"); return 1; } DO(ret = cbc_encrypt(pt, ct, 64, &cbc)); /* decode the block */ DO(ret = cbc_setiv(iv2, l, &cbc)); zeromem(tmp, sizeof(tmp)); DO(ret = cbc_decrypt(ct, tmp, 64, &cbc)); if (memcmp(tmp, pt, 64) != 0) { fprintf(stderr, "CBC failed"); return 1; } #endif #ifdef LTC_CFB_MODE /* test CFB mode */ /* encode the block */ DO(ret = cfb_start(cipher_idx, iv, key, 16, 0, &cfb)); l = sizeof(iv2); DO(ret = cfb_getiv(iv2, &l, &cfb)); /* note we don't memcmp iv2/iv since cfb_start processes the IV for the first block */ if (l != 16) { fprintf(stderr, "cfb_getiv failed"); return 1; } DO(ret = cfb_encrypt(pt, ct, 64, &cfb)); /* decode the block */ DO(ret = cfb_setiv(iv, l, &cfb)); zeromem(tmp, sizeof(tmp)); DO(ret = cfb_decrypt(ct, tmp, 64, &cfb)); if (memcmp(tmp, pt, 64) != 0) { fprintf(stderr, "CFB failed"); return 1; } #endif #ifdef LTC_OFB_MODE /* test OFB mode */ /* encode the block */ DO(ret = ofb_start(cipher_idx, iv, key, 16, 0, &ofb)); l = sizeof(iv2); DO(ret = ofb_getiv(iv2, &l, &ofb)); if (l != 16 || memcmp(iv2, iv, 16)) { fprintf(stderr, "ofb_getiv failed"); return 1; } DO(ret = ofb_encrypt(pt, ct, 64, &ofb)); /* decode the block */ DO(ret = ofb_setiv(iv2, l, &ofb)); zeromem(tmp, sizeof(tmp)); DO(ret = ofb_decrypt(ct, tmp, 64, &ofb)); if (memcmp(tmp, pt, 64) != 0) { fprintf(stderr, "OFB failed"); return 1; } #endif #if defined(LTC_CTR_MODE) && defined(LTC_RIJNDAEL) DO(ret = ctr_test()); #endif #ifdef LTC_XTS_MODE DO(ret = xts_test()); #endif return 0; } /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */