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0475c3655e
Decode negTokenInit with lib/asn1_decoder. For that, add OIDs in linux/oid_registry.h and a negTokenInit ASN1 file, "spnego_negtokeninit.asn1". And define decoder's callback functions, which are the gssapi_this_mech for checking SPENGO oid and the neg_token_init_mech_type for getting authentication mechanisms supported by a server. Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com> Reviewed-by: Aurelien Aptel <aaptel@suse.com> Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz> Signed-off-by: Steve French <stfrench@microsoft.com>
64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/oid_registry.h>
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#include "cifsglob.h"
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#include "cifs_debug.h"
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#include "cifsproto.h"
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#include "cifs_spnego_negtokeninit.asn1.h"
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int
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decode_negTokenInit(unsigned char *security_blob, int length,
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struct TCP_Server_Info *server)
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{
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if (asn1_ber_decoder(&cifs_spnego_negtokeninit_decoder, server,
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security_blob, length) == 0)
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return 1;
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else
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return 0;
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}
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int cifs_gssapi_this_mech(void *context, size_t hdrlen,
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unsigned char tag, const void *value, size_t vlen)
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{
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enum OID oid;
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oid = look_up_OID(value, vlen);
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if (oid != OID_spnego) {
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char buf[50];
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sprint_oid(value, vlen, buf, sizeof(buf));
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cifs_dbg(FYI, "Error decoding negTokenInit header: unexpected OID %s\n",
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buf);
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return -EBADMSG;
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}
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return 0;
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}
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int cifs_neg_token_init_mech_type(void *context, size_t hdrlen,
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unsigned char tag,
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const void *value, size_t vlen)
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{
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struct TCP_Server_Info *server = context;
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enum OID oid;
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oid = look_up_OID(value, vlen);
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if (oid == OID_mskrb5)
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server->sec_mskerberos = true;
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else if (oid == OID_krb5u2u)
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server->sec_kerberosu2u = true;
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else if (oid == OID_krb5)
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server->sec_kerberos = true;
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else if (oid == OID_ntlmssp)
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server->sec_ntlmssp = true;
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else {
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char buf[50];
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sprint_oid(value, vlen, buf, sizeof(buf));
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cifs_dbg(FYI, "Decoding negTokenInit: unsupported OID %s\n",
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buf);
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}
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return 0;
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}
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