I am experiencing a rather odd problem with cryptodev that I am not sure
where to follow next.
The distro is RedSleeve (EL6 armv5tel).
OpenSSH 5.3p1 (EL6 extra patches)
OpenSSL 1.0.1e (EL6 extra patches), rebuild with -DHAVE_CRYPTODEV
(without digests)
Cryptodev 0.9 (yes, I know this is ancient but I tried 1.7 and it made
no difference)
Linux 3.4.6 (old, but heavily patched for both the hardware
compatibility and CVEs, binary that ships with my device)
What works:
mod_ssl with ECDHE-RSA-AES128-GCM-SHA256
openssl s_server <-> s_client
What doesn't:
sshd with offloadable ciphers
Non-offloadable ciphers (e.g. blowfish) always work fine.
aes128-cbc works without cryptodev module loaded, but when it is loaded
the connection breaks _after_ sending the last login information.
With cryptodev loaded and Ciphers set to aes128-cbc:
On the client side, everything seems to work fine, right up to the end:
$ ssh localhost
[...]
debug2: PTY allocation request accepted on channel 0
debug2: channel 0: rcvd adjust 2097152
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
Last login: Tue May 26 16:40:17 2015 from localhost
debug1: channel 0: free: client-session, nchannels 1
debug3: channel 0: status: The following connections are open:
#0 client-session (t4 r0 i0/0 o0/0 fd 4/5 cc -1)
Connection to qnap closed by remote host.
Connection to qnap closed.
Transferred: sent 3472, received 4128 bytes, in 0.5 seconds
Bytes per second: sent 7622.1, received 9062.3
debug1: Exit status -1
This tells me that the connection setup actually succeeds, since this
gets received by the client:
Last login: Tue May 26 16:40:17 2015 from localhost
On the server side with LogLevel DEBUG:
Everything looks OK initially:
[...]
May 26 16:59:49 qnap sshd[29520]: debug1: Allocating pty.
May 26 16:59:49 qnap sshd[29474]: debug1: session_new: session 0
May 26 16:59:49 qnap sshd[29520]: debug1: session_pty_req: session 0
alloc /dev/pts/4
May 26 16:59:49 qnap sshd[29520]: debug1: server_input_channel_req:
channel 0 request env reply 0
May 26 16:59:49 qnap sshd[29520]: debug1: session_by_channel: session 0
channel 0
May 26 16:59:49 qnap sshd[29520]: debug1: session_input_channel_req:
session 0 req env
May 26 16:59:49 qnap sshd[29520]: debug1: server_input_channel_req:
channel 0 request env reply 0
May 26 16:59:49 qnap sshd[29520]: debug1: session_by_channel: session 0
channel 0
May 26 16:59:49 qnap sshd[29520]: debug1: session_input_channel_req:
session 0 req env
May 26 16:59:49 qnap sshd[29520]: debug1: server_input_channel_req:
channel 0 request shell reply 1
May 26 16:59:49 qnap sshd[29520]: debug1: session_by_channel: session 0
channel 0
May 26 16:59:49 qnap sshd[29520]: debug1: session_input_channel_req:
session 0 req shell
May 26 16:59:49 qnap sshd[29521]: debug1: Setting controlling tty using
TIOCSCTTY.
Right up to here:
May 26 16:59:49 qnap sshd[29520]: fatal: evp_crypt: EVP_Cipher failed
The rest appears to be just clean-up:
May 26 16:59:49 qnap sshd[29520]: debug1: do_cleanup
May 26 16:59:49 qnap sshd[29474]: debug1: do_cleanup
May 26 16:59:49 qnap sshd[29474]: debug1: PAM: cleanup
May 26 16:59:49 qnap sshd[29474]: debug1: PAM: closing session
May 26 16:59:49 qnap sshd[29474]: pam_unix(sshd:session): session closed
for user gordan
May 26 16:59:49 qnap sshd[29474]: debug1: PAM: deleting credentials
May 26 16:59:49 qnap sshd[29474]: debug1: session_pty_cleanup: session 0
release /dev/pts/4
The error:
sshd[29520]: fatal: evp_crypt: EVP_Cipher failed
appears to be emitted by sshd rather than OpenSSL or
Cryptodev. The relevant bit of code is in OpenSSH's
cipher.c file:
void
cipher_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int
len)
{
if (len % cc->cipher->block_size)
fatal("cipher_encrypt: bad plaintext length %d", len);
if (EVP_Cipher(&cc->evp, dest, (u_char *)src, len) == 0)
fatal("evp_crypt: EVP_Cipher failed");
}
EVP_Cipher function is part of OpenSSL, declared in:
crypto/evp/evp.h:
int EVP_Cipher(EVP_CIPHER_CTX *c,
unsigned char *out,
const unsigned char *in,
unsigned int inl);
and defined in:
crypto/evp/evp_lib.c:
int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned
char *in, unsigned int inl)
{
#ifdef OPENSSL_FIPS
FIPS_selftest_check();
#endif
return ctx->cipher->do_cipher(ctx,out,in,inl);
}
So it would appear that
ctx->cipher->do_cipher(ctx,out,in,inl);
returns 0.
Any advice on the best way to proceed with troubleshooting this would
be greatly appreciated.
Many thanks.
Gordan
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