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Sebastian Krahmer from the SuSE security team reported that the buffer
overflow check in openvpn_decrypt() was too strict according to the
cipher update function contract:
"The amount of data written depends on the block alignment of the
encrypted data: as a result the amount of data written may be anything
from zero bytes to (inl + cipher_block_size - 1) so outl should contain
sufficient room."
This stems from the way CBC mode works, which caches input and 'flushes'
it block-wise to the output buffer. We do allocate enough space for this
extra block in the output buffer for CBC mode, but not for CFB/OFB modes.
This patch:
* updates the overflow check to also verify that the extra block required
according to the function contract is available.
* uses buf_inc_len() to double-check for overflows during en/decryption.
* also reserves the extra block for non-CBC cipher modes.
In practice, I could not find a way in which this would fail. The plaintext
is never longer than the ciphertext, and the implementations of CBC/OFB/CBC
for AES and BF in both OpenSSL and PolarSSL/mbed TLS do not use the buffer
beyond the plaintext length when decrypting. However, some funky OpenSSL
engine I did not check *might* use the buffer space required by the
function contract. So we should still make sure we have enough room
anyway.
v2 - always ASSERT() on buf_inc_len(). It is a double-check so should
really not fail, but if it fails there has been a buffer overflow.
At that point the best thing we can do is assert out. (The primary
check *is* handled gracefully, and just drops the packet.)
Signed-off-by: Steffan Karger <steffan.karger@fox-it.com>
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <1438165826-32762-1-git-send-email-steffan.karger@fox-it.com>
URL: http://article.gmane.org/gmane.network.openvpn.devel/9974
Signed-off-by: Gert Doering <gert@greenie.muc.de>
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... by not incorrectly hinting to the compiler the function argument of
cipher_kt_mode_{cbc,ofb_cfb}() is nonnull, since that no longer is the
case.
Verified the fix on Debian Wheezy, one of the platforms the reporter in
trac #473 mentions with a compiler that would optimize out the required
checks.
Also add a testcase for --cipher none to t_lpback, to prevent further
regressions.
Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1417552920-31770-1-git-send-email-steffan@karger.me>
URL: http://article.gmane.org/gmane.network.openvpn.devel/9300
Signed-off-by: Gert Doering <gert@greenie.muc.de>
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Some commits ago, the cipher mode checks were cleaned up to
remove code duplication (and fix the issue in #471), but broke
'--cipher none' (reported in #473). This commit fixes that.
Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <545DED2C.5070002@karger.me>
URL: http://article.gmane.org/gmane.network.openvpn.devel/9217
Signed-off-by: Gert Doering <gert@greenie.muc.de>
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Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1406667866-14226-1-git-send-email-steffan@karger.me>
URL: http://article.gmane.org/gmane.network.openvpn.devel/8953
Signed-off-by: Gert Doering <gert@greenie.muc.de>
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OpenSSL has added AEAD-CBC mode ciphers like AES-128-CBC-HMAC-SHA1, which
have mode EVP_CIPH_CBC_MODE, but require a different API (the AEAD API).
So, add extra checks to filter out those AEAD-mode ciphers.
Adding these made the crypto library agnostic function cfb_ofb_mode()
superfuous, so removed that on the go.
Also update all cipher mode checks to use the new cipher_kt_mode_*()
functions for consistency.
Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <1402244175-31462-3-git-send-email-steffan@karger.me>
URL: http://article.gmane.org/gmane.network.openvpn.devel/8779
Signed-off-by: Gert Doering <gert@greenie.muc.de>
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Added translate_cipher name to crypto_openssl.c and crypto_polarssl.c
to translate between OpenVPN(/OpenSSL) and PolarSSL data channel
cipher algorithm names. OpenSSL does not require any translating,
PolarSSL does for a small number of algorithms. This improves on
config file compatibility between the OpenSSL and PolarSSL builds.
Signed-off-by: Steffan Karger <steffan.karger@fox-it.com>
Acked-by: Adriaan de Jong <dejong@fox-it.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1363942465-3251-5-git-send-email-steffan.karger@fox-it.com>
URL: http://article.gmane.org/gmane.network.openvpn.devel/7435
Signed-off-by: Gert Doering <gert@greenie.muc.de>
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Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>
Acked-by: Samuli Seppänen <samuli@openvpn.net>
Signed-off-by: David Sommerseth <davids@redhat.com>
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Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>
Acked-by: Adriaan de Jong <dejong@fox-it.com>
Signed-off-by: David Sommerseth <davids@redhat.com>
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Suitable for mature project.
root - administrative stuff
doc - documents
src - sources
tests - tests
distro - distro specific files
sample - samples
SIDE EFFECT: many changes to rpm spec.
Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>
Acked-by: Adriaan de Jong <dejong@fox-it.com>
Signed-off-by: David Sommerseth <davids@redhat.com>
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