fs/cifs/asn1.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 #include <linux/module.h>
   4 #include <linux/kernel.h>
   5 #include <linux/oid_registry.h>
   6 #include "cifsglob.h"
   7 #include "cifs_debug.h"
   8 #include "cifsproto.h"
   9 #include "cifs_spnego_negtokeninit.asn1.h"
  10
  11 int
  12 decode_negTokenInit(unsigned char *security_blob, int length,
  13                     struct TCP_Server_Info *server)
  14 {
  15         if (asn1_ber_decoder(&cifs_spnego_negtokeninit_decoder, server,
  16                              security_blob, length) == 0)
  17                 return 1;
  18         else
  19                 return 0;
  20 }
  21
  22 int cifs_gssapi_this_mech(void *context, size_t hdrlen,
  23                           unsigned char tag, const void *value, size_t vlen)
  24 {
  25         enum OID oid;
  26
  27         oid = look_up_OID(value, vlen);
  28         if (oid != OID_spnego) {
  29                 char buf[50];
  30
  31                 sprint_oid(value, vlen, buf, sizeof(buf));
  32                 cifs_dbg(FYI, "Error decoding negTokenInit header: unexpected OID %s\n",
  33                          buf);
  34                 return -EBADMSG;
  35         }
  36         return 0;
  37 }
  38
  39 int cifs_neg_token_init_mech_type(void *context, size_t hdrlen,
  40                                   unsigned char tag,
  41                                   const void *value, size_t vlen)
  42 {
  43         struct TCP_Server_Info *server = context;
  44         enum OID oid;
  45
  46         oid = look_up_OID(value, vlen);
  47         if (oid == OID_mskrb5)
  48                 server->sec_mskerberos = true;
  49         else if (oid == OID_krb5u2u)
  50                 server->sec_kerberosu2u = true;
  51         else if (oid == OID_krb5)
  52                 server->sec_kerberos = true;
  53         else if (oid == OID_ntlmssp)
  54                 server->sec_ntlmssp = true;
  55         else {
  56                 char buf[50];
  57
  58                 sprint_oid(value, vlen, buf, sizeof(buf));
  59                 cifs_dbg(FYI, "Decoding negTokenInit: unsupported OID %s\n",
  60                          buf);
  61         }
  62         return 0;
  63 }