sunrpc: trim off trailing checksum before returning decrypted or integrity authenticated buffer

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When GSSAPI integrity signatures are in use, or when we're using GSSAPI
privacy with the v2 token format, there is a trailing checksum on the
xdr_buf that is returned.

It's checked during the authentication stage, and afterward nothing
cares about it. Ordinarily, it's not a problem since the XDR code
generally ignores it, but it will be when we try to compute a checksum
over the buffer to help prevent XID collisions in the duplicate reply
cache.

Fix the code to trim off the checksums after verifying them. Note that
in unwrap_integ_data, we must avoid trying to reverify the checksum if
the request was deferred since it will no longer be present when it's
revisited.

Signed-off-by: Jeff Layton <jlayton@redhat.com>

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This commit is contained in:

Jeff Layton 2013-02-06 08:28:55 -05:00 • committed by J. Bruce Fields

parent de0b65ca55

commit 4c190e2f91

4 changed files with 52 additions and 2 deletions

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1

include/linux/sunrpc/xdr.h

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2

net/sunrpc/auth_gss/gss_krb5_wrap.c

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10

net/sunrpc/auth_gss/svcauth_gss.c

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41

net/sunrpc/xdr.c

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