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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Kees Cook](/assets/img/avatar_default.png)
The kmalloc() function has a 2-factor argument form, kmalloc_array(). This patch replaces cases of: kmalloc(a * b, gfp) with: kmalloc_array(a * b, gfp) as well as handling cases of: kmalloc(a * b * c, gfp) with: kmalloc(array3_size(a, b, c), gfp) as it's slightly less ugly than: kmalloc_array(array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: kmalloc(4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. The tools/ directory was manually excluded, since it has its own implementation of kmalloc(). The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ type TYPE; expression THING, E; @@ ( kmalloc( - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | kmalloc( - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression COUNT; typedef u8; typedef __u8; @@ ( kmalloc( - sizeof(u8) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(__u8) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(char) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(unsigned char) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(u8) * COUNT + COUNT , ...) | kmalloc( - sizeof(__u8) * COUNT + COUNT , ...) | kmalloc( - sizeof(char) * COUNT + COUNT , ...) | kmalloc( - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - kmalloc + kmalloc_array ( - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ identifier SIZE, COUNT; @@ - kmalloc + kmalloc_array ( - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( kmalloc( - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kmalloc( - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kmalloc( - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kmalloc( - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( kmalloc( - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kmalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kmalloc( - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kmalloc( - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kmalloc( - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | kmalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ identifier STRIDE, SIZE, COUNT; @@ ( kmalloc( - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression E1, E2, E3; constant C1, C2, C3; @@ ( kmalloc(C1 * C2 * C3, ...) | kmalloc( - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | kmalloc( - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | kmalloc( - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | kmalloc( - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( kmalloc(sizeof(THING) * C2, ...) | kmalloc(sizeof(TYPE) * C2, ...) | kmalloc(C1 * C2 * C3, ...) | kmalloc(C1 * C2, ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - (E1) * E2 + E1, E2 , ...) | - kmalloc + kmalloc_array ( - (E1) * (E2) + E1, E2 , ...) | - kmalloc + kmalloc_array ( - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
623 lines
14 KiB
C
623 lines
14 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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 "cifspdu.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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/*****************************************************************************
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*
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* Basic ASN.1 decoding routines (gxsnmp author Dirk Wisse)
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*
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*****************************************************************************/
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/* Class */
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#define ASN1_UNI 0 /* Universal */
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#define ASN1_APL 1 /* Application */
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#define ASN1_CTX 2 /* Context */
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#define ASN1_PRV 3 /* Private */
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/* Tag */
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#define ASN1_EOC 0 /* End Of Contents or N/A */
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#define ASN1_BOL 1 /* Boolean */
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#define ASN1_INT 2 /* Integer */
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#define ASN1_BTS 3 /* Bit String */
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#define ASN1_OTS 4 /* Octet String */
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#define ASN1_NUL 5 /* Null */
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#define ASN1_OJI 6 /* Object Identifier */
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#define ASN1_OJD 7 /* Object Description */
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#define ASN1_EXT 8 /* External */
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#define ASN1_ENUM 10 /* Enumerated */
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#define ASN1_SEQ 16 /* Sequence */
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#define ASN1_SET 17 /* Set */
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#define ASN1_NUMSTR 18 /* Numerical String */
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#define ASN1_PRNSTR 19 /* Printable String */
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#define ASN1_TEXSTR 20 /* Teletext String */
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#define ASN1_VIDSTR 21 /* Video String */
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#define ASN1_IA5STR 22 /* IA5 String */
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#define ASN1_UNITIM 23 /* Universal Time */
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#define ASN1_GENTIM 24 /* General Time */
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#define ASN1_GRASTR 25 /* Graphical String */
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#define ASN1_VISSTR 26 /* Visible String */
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#define ASN1_GENSTR 27 /* General String */
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/* Primitive / Constructed methods*/
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#define ASN1_PRI 0 /* Primitive */
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#define ASN1_CON 1 /* Constructed */
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/*
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* Error codes.
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*/
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#define ASN1_ERR_NOERROR 0
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#define ASN1_ERR_DEC_EMPTY 2
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#define ASN1_ERR_DEC_EOC_MISMATCH 3
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#define ASN1_ERR_DEC_LENGTH_MISMATCH 4
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#define ASN1_ERR_DEC_BADVALUE 5
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#define SPNEGO_OID_LEN 7
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#define NTLMSSP_OID_LEN 10
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#define KRB5_OID_LEN 7
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#define KRB5U2U_OID_LEN 8
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#define MSKRB5_OID_LEN 7
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static unsigned long SPNEGO_OID[7] = { 1, 3, 6, 1, 5, 5, 2 };
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static unsigned long NTLMSSP_OID[10] = { 1, 3, 6, 1, 4, 1, 311, 2, 2, 10 };
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static unsigned long KRB5_OID[7] = { 1, 2, 840, 113554, 1, 2, 2 };
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static unsigned long KRB5U2U_OID[8] = { 1, 2, 840, 113554, 1, 2, 2, 3 };
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static unsigned long MSKRB5_OID[7] = { 1, 2, 840, 48018, 1, 2, 2 };
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/*
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* ASN.1 context.
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*/
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struct asn1_ctx {
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int error; /* Error condition */
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unsigned char *pointer; /* Octet just to be decoded */
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unsigned char *begin; /* First octet */
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unsigned char *end; /* Octet after last octet */
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};
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/*
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* Octet string (not null terminated)
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*/
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struct asn1_octstr {
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unsigned char *data;
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unsigned int len;
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};
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static void
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asn1_open(struct asn1_ctx *ctx, unsigned char *buf, unsigned int len)
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{
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ctx->begin = buf;
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ctx->end = buf + len;
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ctx->pointer = buf;
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ctx->error = ASN1_ERR_NOERROR;
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}
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static unsigned char
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asn1_octet_decode(struct asn1_ctx *ctx, unsigned char *ch)
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{
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if (ctx->pointer >= ctx->end) {
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ctx->error = ASN1_ERR_DEC_EMPTY;
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return 0;
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}
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*ch = *(ctx->pointer)++;
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return 1;
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}
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#if 0 /* will be needed later by spnego decoding/encoding of ntlmssp */
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static unsigned char
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asn1_enum_decode(struct asn1_ctx *ctx, __le32 *val)
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{
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unsigned char ch;
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if (ctx->pointer >= ctx->end) {
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ctx->error = ASN1_ERR_DEC_EMPTY;
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return 0;
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}
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ch = *(ctx->pointer)++; /* ch has 0xa, ptr points to length octet */
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if ((ch) == ASN1_ENUM) /* if ch value is ENUM, 0xa */
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*val = *(++(ctx->pointer)); /* value has enum value */
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else
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return 0;
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ctx->pointer++;
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return 1;
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}
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#endif
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static unsigned char
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asn1_tag_decode(struct asn1_ctx *ctx, unsigned int *tag)
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{
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unsigned char ch;
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*tag = 0;
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do {
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if (!asn1_octet_decode(ctx, &ch))
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return 0;
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*tag <<= 7;
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*tag |= ch & 0x7F;
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} while ((ch & 0x80) == 0x80);
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return 1;
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}
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static unsigned char
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asn1_id_decode(struct asn1_ctx *ctx,
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unsigned int *cls, unsigned int *con, unsigned int *tag)
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{
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unsigned char ch;
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if (!asn1_octet_decode(ctx, &ch))
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return 0;
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*cls = (ch & 0xC0) >> 6;
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*con = (ch & 0x20) >> 5;
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*tag = (ch & 0x1F);
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if (*tag == 0x1F) {
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if (!asn1_tag_decode(ctx, tag))
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return 0;
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}
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return 1;
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}
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static unsigned char
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asn1_length_decode(struct asn1_ctx *ctx, unsigned int *def, unsigned int *len)
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{
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unsigned char ch, cnt;
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if (!asn1_octet_decode(ctx, &ch))
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return 0;
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if (ch == 0x80)
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*def = 0;
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else {
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*def = 1;
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if (ch < 0x80)
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*len = ch;
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else {
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cnt = (unsigned char) (ch & 0x7F);
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*len = 0;
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while (cnt > 0) {
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if (!asn1_octet_decode(ctx, &ch))
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return 0;
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*len <<= 8;
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*len |= ch;
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cnt--;
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}
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}
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}
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/* don't trust len bigger than ctx buffer */
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if (*len > ctx->end - ctx->pointer)
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return 0;
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return 1;
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}
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static unsigned char
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asn1_header_decode(struct asn1_ctx *ctx,
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unsigned char **eoc,
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unsigned int *cls, unsigned int *con, unsigned int *tag)
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{
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unsigned int def = 0;
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unsigned int len = 0;
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if (!asn1_id_decode(ctx, cls, con, tag))
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return 0;
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if (!asn1_length_decode(ctx, &def, &len))
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return 0;
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/* primitive shall be definite, indefinite shall be constructed */
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if (*con == ASN1_PRI && !def)
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return 0;
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if (def)
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*eoc = ctx->pointer + len;
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else
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*eoc = NULL;
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return 1;
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}
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static unsigned char
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asn1_eoc_decode(struct asn1_ctx *ctx, unsigned char *eoc)
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{
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unsigned char ch;
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if (eoc == NULL) {
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if (!asn1_octet_decode(ctx, &ch))
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return 0;
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if (ch != 0x00) {
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ctx->error = ASN1_ERR_DEC_EOC_MISMATCH;
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return 0;
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}
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if (!asn1_octet_decode(ctx, &ch))
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return 0;
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if (ch != 0x00) {
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ctx->error = ASN1_ERR_DEC_EOC_MISMATCH;
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return 0;
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}
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return 1;
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} else {
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if (ctx->pointer != eoc) {
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ctx->error = ASN1_ERR_DEC_LENGTH_MISMATCH;
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return 0;
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}
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return 1;
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}
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}
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/* static unsigned char asn1_null_decode(struct asn1_ctx *ctx,
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unsigned char *eoc)
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{
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ctx->pointer = eoc;
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return 1;
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}
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static unsigned char asn1_long_decode(struct asn1_ctx *ctx,
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unsigned char *eoc, long *integer)
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{
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unsigned char ch;
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unsigned int len;
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if (!asn1_octet_decode(ctx, &ch))
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return 0;
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*integer = (signed char) ch;
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len = 1;
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while (ctx->pointer < eoc) {
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if (++len > sizeof(long)) {
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ctx->error = ASN1_ERR_DEC_BADVALUE;
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return 0;
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}
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if (!asn1_octet_decode(ctx, &ch))
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return 0;
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*integer <<= 8;
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*integer |= ch;
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}
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return 1;
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}
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static unsigned char asn1_uint_decode(struct asn1_ctx *ctx,
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unsigned char *eoc,
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unsigned int *integer)
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{
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unsigned char ch;
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unsigned int len;
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if (!asn1_octet_decode(ctx, &ch))
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return 0;
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*integer = ch;
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if (ch == 0)
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len = 0;
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else
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len = 1;
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while (ctx->pointer < eoc) {
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if (++len > sizeof(unsigned int)) {
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ctx->error = ASN1_ERR_DEC_BADVALUE;
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return 0;
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}
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if (!asn1_octet_decode(ctx, &ch))
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return 0;
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*integer <<= 8;
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*integer |= ch;
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}
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return 1;
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}
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static unsigned char asn1_ulong_decode(struct asn1_ctx *ctx,
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unsigned char *eoc,
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unsigned long *integer)
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{
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unsigned char ch;
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unsigned int len;
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if (!asn1_octet_decode(ctx, &ch))
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return 0;
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*integer = ch;
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if (ch == 0)
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len = 0;
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else
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len = 1;
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while (ctx->pointer < eoc) {
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if (++len > sizeof(unsigned long)) {
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ctx->error = ASN1_ERR_DEC_BADVALUE;
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return 0;
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}
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if (!asn1_octet_decode(ctx, &ch))
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return 0;
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*integer <<= 8;
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*integer |= ch;
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}
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return 1;
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}
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static unsigned char
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asn1_octets_decode(struct asn1_ctx *ctx,
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unsigned char *eoc,
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unsigned char **octets, unsigned int *len)
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{
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unsigned char *ptr;
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*len = 0;
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*octets = kmalloc(eoc - ctx->pointer, GFP_ATOMIC);
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if (*octets == NULL) {
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return 0;
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}
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ptr = *octets;
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while (ctx->pointer < eoc) {
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if (!asn1_octet_decode(ctx, (unsigned char *) ptr++)) {
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kfree(*octets);
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*octets = NULL;
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return 0;
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}
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(*len)++;
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}
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return 1;
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} */
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static unsigned char
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asn1_subid_decode(struct asn1_ctx *ctx, unsigned long *subid)
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{
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unsigned char ch;
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*subid = 0;
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do {
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if (!asn1_octet_decode(ctx, &ch))
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return 0;
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*subid <<= 7;
|
|
*subid |= ch & 0x7F;
|
|
} while ((ch & 0x80) == 0x80);
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
asn1_oid_decode(struct asn1_ctx *ctx,
|
|
unsigned char *eoc, unsigned long **oid, unsigned int *len)
|
|
{
|
|
unsigned long subid;
|
|
unsigned int size;
|
|
unsigned long *optr;
|
|
|
|
size = eoc - ctx->pointer + 1;
|
|
|
|
/* first subid actually encodes first two subids */
|
|
if (size < 2 || size > UINT_MAX/sizeof(unsigned long))
|
|
return 0;
|
|
|
|
*oid = kmalloc_array(size, sizeof(unsigned long), GFP_ATOMIC);
|
|
if (*oid == NULL)
|
|
return 0;
|
|
|
|
optr = *oid;
|
|
|
|
if (!asn1_subid_decode(ctx, &subid)) {
|
|
kfree(*oid);
|
|
*oid = NULL;
|
|
return 0;
|
|
}
|
|
|
|
if (subid < 40) {
|
|
optr[0] = 0;
|
|
optr[1] = subid;
|
|
} else if (subid < 80) {
|
|
optr[0] = 1;
|
|
optr[1] = subid - 40;
|
|
} else {
|
|
optr[0] = 2;
|
|
optr[1] = subid - 80;
|
|
}
|
|
|
|
*len = 2;
|
|
optr += 2;
|
|
|
|
while (ctx->pointer < eoc) {
|
|
if (++(*len) > size) {
|
|
ctx->error = ASN1_ERR_DEC_BADVALUE;
|
|
kfree(*oid);
|
|
*oid = NULL;
|
|
return 0;
|
|
}
|
|
|
|
if (!asn1_subid_decode(ctx, optr++)) {
|
|
kfree(*oid);
|
|
*oid = NULL;
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
compare_oid(unsigned long *oid1, unsigned int oid1len,
|
|
unsigned long *oid2, unsigned int oid2len)
|
|
{
|
|
unsigned int i;
|
|
|
|
if (oid1len != oid2len)
|
|
return 0;
|
|
else {
|
|
for (i = 0; i < oid1len; i++) {
|
|
if (oid1[i] != oid2[i])
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/* BB check for endian conversion issues here */
|
|
|
|
int
|
|
decode_negTokenInit(unsigned char *security_blob, int length,
|
|
struct TCP_Server_Info *server)
|
|
{
|
|
struct asn1_ctx ctx;
|
|
unsigned char *end;
|
|
unsigned char *sequence_end;
|
|
unsigned long *oid = NULL;
|
|
unsigned int cls, con, tag, oidlen, rc;
|
|
|
|
/* cifs_dump_mem(" Received SecBlob ", security_blob, length); */
|
|
|
|
asn1_open(&ctx, security_blob, length);
|
|
|
|
/* GSSAPI header */
|
|
if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
|
|
cifs_dbg(FYI, "Error decoding negTokenInit header\n");
|
|
return 0;
|
|
} else if ((cls != ASN1_APL) || (con != ASN1_CON)
|
|
|| (tag != ASN1_EOC)) {
|
|
cifs_dbg(FYI, "cls = %d con = %d tag = %d\n", cls, con, tag);
|
|
return 0;
|
|
}
|
|
|
|
/* Check for SPNEGO OID -- remember to free obj->oid */
|
|
rc = asn1_header_decode(&ctx, &end, &cls, &con, &tag);
|
|
if (rc) {
|
|
if ((tag == ASN1_OJI) && (con == ASN1_PRI) &&
|
|
(cls == ASN1_UNI)) {
|
|
rc = asn1_oid_decode(&ctx, end, &oid, &oidlen);
|
|
if (rc) {
|
|
rc = compare_oid(oid, oidlen, SPNEGO_OID,
|
|
SPNEGO_OID_LEN);
|
|
kfree(oid);
|
|
}
|
|
} else
|
|
rc = 0;
|
|
}
|
|
|
|
/* SPNEGO OID not present or garbled -- bail out */
|
|
if (!rc) {
|
|
cifs_dbg(FYI, "Error decoding negTokenInit header\n");
|
|
return 0;
|
|
}
|
|
|
|
/* SPNEGO */
|
|
if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
|
|
cifs_dbg(FYI, "Error decoding negTokenInit\n");
|
|
return 0;
|
|
} else if ((cls != ASN1_CTX) || (con != ASN1_CON)
|
|
|| (tag != ASN1_EOC)) {
|
|
cifs_dbg(FYI, "cls = %d con = %d tag = %d end = %p (%d) exit 0\n",
|
|
cls, con, tag, end, *end);
|
|
return 0;
|
|
}
|
|
|
|
/* negTokenInit */
|
|
if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
|
|
cifs_dbg(FYI, "Error decoding negTokenInit\n");
|
|
return 0;
|
|
} else if ((cls != ASN1_UNI) || (con != ASN1_CON)
|
|
|| (tag != ASN1_SEQ)) {
|
|
cifs_dbg(FYI, "cls = %d con = %d tag = %d end = %p (%d) exit 1\n",
|
|
cls, con, tag, end, *end);
|
|
return 0;
|
|
}
|
|
|
|
/* sequence */
|
|
if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
|
|
cifs_dbg(FYI, "Error decoding 2nd part of negTokenInit\n");
|
|
return 0;
|
|
} else if ((cls != ASN1_CTX) || (con != ASN1_CON)
|
|
|| (tag != ASN1_EOC)) {
|
|
cifs_dbg(FYI, "cls = %d con = %d tag = %d end = %p (%d) exit 0\n",
|
|
cls, con, tag, end, *end);
|
|
return 0;
|
|
}
|
|
|
|
/* sequence of */
|
|
if (asn1_header_decode
|
|
(&ctx, &sequence_end, &cls, &con, &tag) == 0) {
|
|
cifs_dbg(FYI, "Error decoding 2nd part of negTokenInit\n");
|
|
return 0;
|
|
} else if ((cls != ASN1_UNI) || (con != ASN1_CON)
|
|
|| (tag != ASN1_SEQ)) {
|
|
cifs_dbg(FYI, "cls = %d con = %d tag = %d end = %p (%d) exit 1\n",
|
|
cls, con, tag, end, *end);
|
|
return 0;
|
|
}
|
|
|
|
/* list of security mechanisms */
|
|
while (!asn1_eoc_decode(&ctx, sequence_end)) {
|
|
rc = asn1_header_decode(&ctx, &end, &cls, &con, &tag);
|
|
if (!rc) {
|
|
cifs_dbg(FYI, "Error decoding negTokenInit hdr exit2\n");
|
|
return 0;
|
|
}
|
|
if ((tag == ASN1_OJI) && (con == ASN1_PRI)) {
|
|
if (asn1_oid_decode(&ctx, end, &oid, &oidlen)) {
|
|
|
|
cifs_dbg(FYI, "OID len = %d oid = 0x%lx 0x%lx 0x%lx 0x%lx\n",
|
|
oidlen, *oid, *(oid + 1), *(oid + 2),
|
|
*(oid + 3));
|
|
|
|
if (compare_oid(oid, oidlen, MSKRB5_OID,
|
|
MSKRB5_OID_LEN))
|
|
server->sec_mskerberos = true;
|
|
else if (compare_oid(oid, oidlen, KRB5U2U_OID,
|
|
KRB5U2U_OID_LEN))
|
|
server->sec_kerberosu2u = true;
|
|
else if (compare_oid(oid, oidlen, KRB5_OID,
|
|
KRB5_OID_LEN))
|
|
server->sec_kerberos = true;
|
|
else if (compare_oid(oid, oidlen, NTLMSSP_OID,
|
|
NTLMSSP_OID_LEN))
|
|
server->sec_ntlmssp = true;
|
|
|
|
kfree(oid);
|
|
}
|
|
} else {
|
|
cifs_dbg(FYI, "Should be an oid what is going on?\n");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We currently ignore anything at the end of the SPNEGO blob after
|
|
* the mechTypes have been parsed, since none of that info is
|
|
* used at the moment.
|
|
*/
|
|
return 1;
|
|
}
|