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233ce79db4
An ANY object in an ASN.1 grammar that is marked OPTIONAL should be skipped
if there is no more data to be had.
This can be tested by editing X.509 certificates or PKCS#7 messages to
remove the NULL from subobjects that look like the following:
SEQUENCE {
OBJECT(2a864886f70d01010b);
NULL();
}
This is an algorithm identifier plus an optional parameter.
The modified DER can be passed to one of:
keyctl padd asymmetric "" @s </tmp/modified.x509
keyctl padd pkcs7_test foo @s </tmp/modified.pkcs7
It should work okay with the patch and produce EBADMSG without.
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Marcel Holtmann <marcel@holtmann.org>
Reviewed-by: David Woodhouse <David.Woodhouse@intel.com>
94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/* ASN.1 BER/DER/CER parsing state machine internal definitions
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*
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* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _LINUX_ASN1_BER_BYTECODE_H
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#define _LINUX_ASN1_BER_BYTECODE_H
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#ifdef __KERNEL__
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#include <linux/types.h>
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#endif
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#include <linux/asn1.h>
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typedef int (*asn1_action_t)(void *context,
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size_t hdrlen, /* In case of ANY type */
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unsigned char tag, /* In case of ANY type */
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const void *value, size_t vlen);
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struct asn1_decoder {
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const unsigned char *machine;
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size_t machlen;
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const asn1_action_t *actions;
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};
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enum asn1_opcode {
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/* The tag-matching ops come first and the odd-numbered slots
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* are for OR_SKIP ops.
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*/
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#define ASN1_OP_MATCH__SKIP 0x01
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#define ASN1_OP_MATCH__ACT 0x02
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#define ASN1_OP_MATCH__JUMP 0x04
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#define ASN1_OP_MATCH__ANY 0x08
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#define ASN1_OP_MATCH__COND 0x10
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ASN1_OP_MATCH = 0x00,
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ASN1_OP_MATCH_OR_SKIP = 0x01,
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ASN1_OP_MATCH_ACT = 0x02,
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ASN1_OP_MATCH_ACT_OR_SKIP = 0x03,
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ASN1_OP_MATCH_JUMP = 0x04,
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ASN1_OP_MATCH_JUMP_OR_SKIP = 0x05,
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ASN1_OP_MATCH_ANY = 0x08,
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ASN1_OP_MATCH_ANY_OR_SKIP = 0x09,
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ASN1_OP_MATCH_ANY_ACT = 0x0a,
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ASN1_OP_MATCH_ANY_ACT_OR_SKIP = 0x0b,
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/* Everything before here matches unconditionally */
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ASN1_OP_COND_MATCH_OR_SKIP = 0x11,
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ASN1_OP_COND_MATCH_ACT_OR_SKIP = 0x13,
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ASN1_OP_COND_MATCH_JUMP_OR_SKIP = 0x15,
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ASN1_OP_COND_MATCH_ANY = 0x18,
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ASN1_OP_COND_MATCH_ANY_OR_SKIP = 0x19,
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ASN1_OP_COND_MATCH_ANY_ACT = 0x1a,
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ASN1_OP_COND_MATCH_ANY_ACT_OR_SKIP = 0x1b,
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/* Everything before here will want a tag from the data */
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#define ASN1_OP__MATCHES_TAG ASN1_OP_COND_MATCH_ANY_ACT_OR_SKIP
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/* These are here to help fill up space */
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ASN1_OP_COND_FAIL = 0x1c,
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ASN1_OP_COMPLETE = 0x1d,
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ASN1_OP_ACT = 0x1e,
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ASN1_OP_MAYBE_ACT = 0x1f,
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/* The following eight have bit 0 -> SET, 1 -> OF, 2 -> ACT */
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ASN1_OP_END_SEQ = 0x20,
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ASN1_OP_END_SET = 0x21,
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ASN1_OP_END_SEQ_OF = 0x22,
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ASN1_OP_END_SET_OF = 0x23,
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ASN1_OP_END_SEQ_ACT = 0x24,
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ASN1_OP_END_SET_ACT = 0x25,
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ASN1_OP_END_SEQ_OF_ACT = 0x26,
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ASN1_OP_END_SET_OF_ACT = 0x27,
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#define ASN1_OP_END__SET 0x01
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#define ASN1_OP_END__OF 0x02
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#define ASN1_OP_END__ACT 0x04
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ASN1_OP_RETURN = 0x28,
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ASN1_OP__NR
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};
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#define _tag(CLASS, CP, TAG) ((ASN1_##CLASS << 6) | (ASN1_##CP << 5) | ASN1_##TAG)
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#define _tagn(CLASS, CP, TAG) ((ASN1_##CLASS << 6) | (ASN1_##CP << 5) | TAG)
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#define _jump_target(N) (N)
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#define _action(N) (N)
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#endif /* _LINUX_ASN1_BER_BYTECODE_H */
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