diff options
| author | Marc Dionne <marc.dionne@auristor.com> | 2020-09-04 14:01:24 -0300 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2020-10-05 16:33:28 +0100 |
| commit | 56305118e05b2db8d0395bba640ac9a3aee92624 (patch) | |
| tree | fbba433f6f0b290d1c97ea775abadbe7eec20ad5 | |
| parent | 4296adc3e32f5d544a95061160fe7e127be1b9ff (diff) | |
| download | lwn-56305118e05b2db8d0395bba640ac9a3aee92624.tar.gz lwn-56305118e05b2db8d0395bba640ac9a3aee92624.zip | |
rxrpc: Fix rxkad token xdr encoding
The session key should be encoded with just the 8 data bytes and
no length; ENCODE_DATA precedes it with a 4 byte length, which
confuses some existing tools that try to parse this format.
Add an ENCODE_BYTES macro that does not include a length, and use
it for the key. Also adjust the expected length.
Note that commit 774521f353e1d ("rxrpc: Fix an assertion in
rxrpc_read()") had fixed a BUG by changing the length rather than
fixing the encoding. The original length was correct.
Fixes: 99455153d067 ("RxRPC: Parse security index 5 keys (Kerberos 5)")
Signed-off-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
| -rw-r--r-- | net/rxrpc/key.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/net/rxrpc/key.c b/net/rxrpc/key.c index 94c3df392651..8f7d7a6187db 100644 --- a/net/rxrpc/key.c +++ b/net/rxrpc/key.c @@ -1072,7 +1072,7 @@ static long rxrpc_read(const struct key *key, switch (token->security_index) { case RXRPC_SECURITY_RXKAD: - toksize += 9 * 4; /* viceid, kvno, key*2 + len, begin, + toksize += 8 * 4; /* viceid, kvno, key*2, begin, * end, primary, tktlen */ toksize += RND(token->kad->ticket_len); break; @@ -1138,6 +1138,14 @@ static long rxrpc_read(const struct key *key, memcpy((u8 *)xdr + _l, &zero, 4 - (_l & 3)); \ xdr += (_l + 3) >> 2; \ } while(0) +#define ENCODE_BYTES(l, s) \ + do { \ + u32 _l = (l); \ + memcpy(xdr, (s), _l); \ + if (_l & 3) \ + memcpy((u8 *)xdr + _l, &zero, 4 - (_l & 3)); \ + xdr += (_l + 3) >> 2; \ + } while(0) #define ENCODE64(x) \ do { \ __be64 y = cpu_to_be64(x); \ @@ -1165,7 +1173,7 @@ static long rxrpc_read(const struct key *key, case RXRPC_SECURITY_RXKAD: ENCODE(token->kad->vice_id); ENCODE(token->kad->kvno); - ENCODE_DATA(8, token->kad->session_key); + ENCODE_BYTES(8, token->kad->session_key); ENCODE(token->kad->start); ENCODE(token->kad->expiry); ENCODE(token->kad->primary_flag); |