SUNRPC: Add an XDR decoding helper for struct opaque_auth

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RFC 5531 defines the body of an RPC Call message like this:

	struct call_body {
		unsigned int rpcvers;
		unsigned int prog;
		unsigned int vers;
		unsigned int proc;
		opaque_auth cred;
		opaque_auth verf;
		/* procedure-specific parameters start here */
	};

In the current server code, decoding a struct opaque_auth type is
open-coded in several places, and is thus difficult to harden
everywhere.

Introduce a helper for decoding an opaque_auth within the context
of a xdr_stream. This helper can be shared with all authentication
flavor implemenations, even on the client-side.

Done as part of hardening the server-side RPC header decoding paths.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

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This commit is contained in:

Chuck Lever 2023-01-02 12:05:43 -05:00

parent 1e9e177df3

commit 846b5756d7

2 changed files with 31 additions and 0 deletions

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3

include/linux/sunrpc/xdr.h

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28

net/sunrpc/xdr.c

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