239 строки
5.5 KiB
C
239 строки
5.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* The ASB.1/BER parsing code is derived from ip_nat_snmp_basic.c which was in
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* turn derived from the gxsnmp package by Gregory McLean & Jochen Friedrich
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*
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* Copyright (c) 2000 RP Internet (www.rpi.net.au).
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/oid_registry.h>
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#include "glob.h"
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#include "asn1.h"
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#include "connection.h"
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#include "auth.h"
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#include "ksmbd_spnego_negtokeninit.asn1.h"
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#include "ksmbd_spnego_negtokentarg.asn1.h"
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#define NTLMSSP_OID_LEN 10
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static char NTLMSSP_OID_STR[NTLMSSP_OID_LEN] = { 0x2b, 0x06, 0x01, 0x04, 0x01,
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0x82, 0x37, 0x02, 0x02, 0x0a };
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int
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ksmbd_decode_negTokenInit(unsigned char *security_blob, int length,
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struct ksmbd_conn *conn)
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{
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return asn1_ber_decoder(&ksmbd_spnego_negtokeninit_decoder, conn,
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security_blob, length);
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}
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int
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ksmbd_decode_negTokenTarg(unsigned char *security_blob, int length,
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struct ksmbd_conn *conn)
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{
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return asn1_ber_decoder(&ksmbd_spnego_negtokentarg_decoder, conn,
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security_blob, length);
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}
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static int compute_asn_hdr_len_bytes(int len)
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{
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if (len > 0xFFFFFF)
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return 4;
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else if (len > 0xFFFF)
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return 3;
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else if (len > 0xFF)
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return 2;
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else if (len > 0x7F)
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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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static void encode_asn_tag(char *buf, unsigned int *ofs, char tag, char seq,
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int length)
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{
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int i;
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int index = *ofs;
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char hdr_len = compute_asn_hdr_len_bytes(length);
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int len = length + 2 + hdr_len;
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/* insert tag */
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buf[index++] = tag;
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if (!hdr_len) {
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buf[index++] = len;
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} else {
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buf[index++] = 0x80 | hdr_len;
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for (i = hdr_len - 1; i >= 0; i--)
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buf[index++] = (len >> (i * 8)) & 0xFF;
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}
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/* insert seq */
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len = len - (index - *ofs);
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buf[index++] = seq;
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if (!hdr_len) {
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buf[index++] = len;
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} else {
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buf[index++] = 0x80 | hdr_len;
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for (i = hdr_len - 1; i >= 0; i--)
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buf[index++] = (len >> (i * 8)) & 0xFF;
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}
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*ofs += (index - *ofs);
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}
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int build_spnego_ntlmssp_neg_blob(unsigned char **pbuffer, u16 *buflen,
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char *ntlm_blob, int ntlm_blob_len)
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{
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char *buf;
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unsigned int ofs = 0;
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int neg_result_len = 4 + compute_asn_hdr_len_bytes(1) * 2 + 1;
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int oid_len = 4 + compute_asn_hdr_len_bytes(NTLMSSP_OID_LEN) * 2 +
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NTLMSSP_OID_LEN;
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int ntlmssp_len = 4 + compute_asn_hdr_len_bytes(ntlm_blob_len) * 2 +
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ntlm_blob_len;
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int total_len = 4 + compute_asn_hdr_len_bytes(neg_result_len +
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oid_len + ntlmssp_len) * 2 +
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neg_result_len + oid_len + ntlmssp_len;
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buf = kmalloc(total_len, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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/* insert main gss header */
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encode_asn_tag(buf, &ofs, 0xa1, 0x30, neg_result_len + oid_len +
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ntlmssp_len);
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/* insert neg result */
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encode_asn_tag(buf, &ofs, 0xa0, 0x0a, 1);
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buf[ofs++] = 1;
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/* insert oid */
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encode_asn_tag(buf, &ofs, 0xa1, 0x06, NTLMSSP_OID_LEN);
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memcpy(buf + ofs, NTLMSSP_OID_STR, NTLMSSP_OID_LEN);
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ofs += NTLMSSP_OID_LEN;
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/* insert response token - ntlmssp blob */
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encode_asn_tag(buf, &ofs, 0xa2, 0x04, ntlm_blob_len);
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memcpy(buf + ofs, ntlm_blob, ntlm_blob_len);
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ofs += ntlm_blob_len;
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*pbuffer = buf;
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*buflen = total_len;
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return 0;
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}
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int build_spnego_ntlmssp_auth_blob(unsigned char **pbuffer, u16 *buflen,
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int neg_result)
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{
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char *buf;
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unsigned int ofs = 0;
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int neg_result_len = 4 + compute_asn_hdr_len_bytes(1) * 2 + 1;
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int total_len = 4 + compute_asn_hdr_len_bytes(neg_result_len) * 2 +
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neg_result_len;
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buf = kmalloc(total_len, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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/* insert main gss header */
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encode_asn_tag(buf, &ofs, 0xa1, 0x30, neg_result_len);
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/* insert neg result */
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encode_asn_tag(buf, &ofs, 0xa0, 0x0a, 1);
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if (neg_result)
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buf[ofs++] = 2;
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else
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buf[ofs++] = 0;
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*pbuffer = buf;
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*buflen = total_len;
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return 0;
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}
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int ksmbd_gssapi_this_mech(void *context, size_t hdrlen, unsigned char tag,
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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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ksmbd_debug(AUTH, "Unexpected OID: %s\n", 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 ksmbd_neg_token_init_mech_type(void *context, size_t hdrlen,
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unsigned char tag, const void *value,
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size_t vlen)
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{
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struct ksmbd_conn *conn = context;
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enum OID oid;
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int mech_type;
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oid = look_up_OID(value, vlen);
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if (oid == OID_ntlmssp) {
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mech_type = KSMBD_AUTH_NTLMSSP;
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} else if (oid == OID_mskrb5) {
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mech_type = KSMBD_AUTH_MSKRB5;
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} else if (oid == OID_krb5) {
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mech_type = KSMBD_AUTH_KRB5;
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} else if (oid == OID_krb5u2u) {
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mech_type = KSMBD_AUTH_KRB5U2U;
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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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ksmbd_debug(AUTH, "Unexpected OID: %s\n", buf);
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return -EBADMSG;
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}
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conn->auth_mechs |= mech_type;
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if (conn->preferred_auth_mech == 0)
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conn->preferred_auth_mech = mech_type;
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return 0;
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}
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static int ksmbd_neg_token_alloc(void *context, size_t hdrlen,
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unsigned char tag, const void *value,
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size_t vlen)
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{
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struct ksmbd_conn *conn = context;
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conn->mechToken = kmalloc(vlen + 1, GFP_KERNEL);
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if (!conn->mechToken)
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return -ENOMEM;
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memcpy(conn->mechToken, value, vlen);
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conn->mechToken[vlen] = '\0';
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return 0;
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}
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int ksmbd_neg_token_init_mech_token(void *context, size_t hdrlen,
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unsigned char tag, const void *value,
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size_t vlen)
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{
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return ksmbd_neg_token_alloc(context, hdrlen, tag, value, vlen);
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}
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int ksmbd_neg_token_targ_resp_token(void *context, size_t hdrlen,
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unsigned char tag, const void *value,
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size_t vlen)
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{
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return ksmbd_neg_token_alloc(context, hdrlen, tag, value, vlen);
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}
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