| Message ID | 20210606010608.105516-1-hyc.lee@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v4] cifs: decoding negTokenInit with generic ASN1 decoder | expand |
"make M=fs/cifs" from the top of the kernel tree worked, but my usual
script failed
"cd fs/cifs"
then
"make C=1 -C /usr/src/linux-headers-`uname -r` M=`pwd` modules
CF=-D__CHECK_ENDIAN__"
failed with (even after generating the files with the "make M=fs/cifs" earlier):
ASN.1 /home/smfrench/cifs-2.6/fs/cifs/spnego_negtokeninit.asn1.[ch]
CC [M] /home/smfrench/cifs-2.6/fs/cifs/asn1.o
/home/smfrench/cifs-2.6/fs/cifs/asn1.c: In function ‘gssapi_this_mech’:
/home/smfrench/cifs-2.6/fs/cifs/asn1.c:28:13: error: ‘OID_spnego’
undeclared (first use in this function)
28 | if (oid != OID_spnego) {
| ^~~~~~~~~~
/home/smfrench/cifs-2.6/fs/cifs/asn1.c:28:13: note: each undeclared
identifier is reported only once for each function it appears in
/home/smfrench/cifs-2.6/fs/cifs/asn1.c: In function ‘neg_token_init_mech_type’:
/home/smfrench/cifs-2.6/fs/cifs/asn1.c:47:13: error: ‘OID_mskrb5’
undeclared (first use in this function); did you mean ‘OID_md5’?
47 | if (oid == OID_mskrb5)
| ^~~~~~~~~~
| OID_md5
/home/smfrench/cifs-2.6/fs/cifs/asn1.c:49:18: error: ‘OID_krb5u2u’
undeclared (first use in this function)
49 | else if (oid == OID_krb5u2u)
| ^~~~~~~~~~~
/home/smfrench/cifs-2.6/fs/cifs/asn1.c:51:18: error: ‘OID_krb5’
undeclared (first use in this function)
51 | else if (oid == OID_krb5)
| ^~~~~~~~
/home/smfrench/cifs-2.6/fs/cifs/asn1.c:53:18: error: ‘OID_ntlmssp’
undeclared (first use in this function)
53 | else if (oid == OID_ntlmssp)
| ^~~~~~~~~~~
make[1]: *** [scripts/Makefile.build:272:
/home/smfrench/cifs-2.6/fs/cifs/asn1.o] Error 1
make: *** [Makefile:1845: /home/smfrench/cifs-2.6/fs/cifs] Error 2
make: Leaving directory
'/usr/src/linux-headers-5.13.0-051300rc3daily20210526-generic
On Sat, Jun 5, 2021 at 8:07 PM Hyunchul Lee <hyc.lee@gmail.com> wrote:
>
> 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>
> ---
> changes from v3:
> - Change Makefile to fix a compile error, "spnego_negtokeninit.asn1.h: No such file or directory".
> changes from v2:
> - Change Makefile to fix a compile error(kernel test bot).
> - Add cifsproto.h into asn1.c to fix a compile warning(kernel test bot).
> chnages from v1:
> - Select CONFIG_OID_REGISTRY
>
> fs/cifs/Kconfig | 2 +
> fs/cifs/Makefile | 8 +-
> fs/cifs/asn1.c | 623 ++-----------------------------
> fs/cifs/spnego_negtokeninit.asn1 | 40 ++
> include/linux/oid_registry.h | 8 +
> 5 files changed, 93 insertions(+), 588 deletions(-)
> create mode 100644 fs/cifs/spnego_negtokeninit.asn1
>
> diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig
> index bf52e9326ebe..7de5c893c181 100644
> --- a/fs/cifs/Kconfig
> +++ b/fs/cifs/Kconfig
> @@ -19,6 +19,8 @@ config CIFS
> select CRYPTO_LIB_DES
> select KEYS
> select DNS_RESOLVER
> + select ASN1
> + select OID_REGISTRY
> help
> This is the client VFS module for the SMB3 family of NAS protocols,
> (including support for the most recent, most secure dialect SMB3.1.1)
> diff --git a/fs/cifs/Makefile b/fs/cifs/Makefile
> index 3ee3b7de4ded..9d877eafd350 100644
> --- a/fs/cifs/Makefile
> +++ b/fs/cifs/Makefile
> @@ -6,12 +6,16 @@ ccflags-y += -I$(src) # needed for trace events
> obj-$(CONFIG_CIFS) += cifs.o
>
> cifs-y := trace.o cifsfs.o cifssmb.o cifs_debug.o connect.o dir.o file.o \
> - inode.o link.o misc.o netmisc.o smbencrypt.o transport.o asn1.o \
> + inode.o link.o misc.o netmisc.o smbencrypt.o transport.o \
> cifs_unicode.o nterr.o cifsencrypt.o \
> readdir.o ioctl.o sess.o export.o smb1ops.o unc.o winucase.o \
> smb2ops.o smb2maperror.o smb2transport.o \
> smb2misc.o smb2pdu.o smb2inode.o smb2file.o cifsacl.o fs_context.o \
> - dns_resolve.o
> + dns_resolve.o spnego_negtokeninit.asn1.o asn1.o
> +
> +$(obj)/asn1.o: $(obj)/spnego_negtokeninit.asn1.h
> +
> +$(obj)/spnego_negtokeninit.asn1.o: $(obj)/spnego_negtokeninit.asn1.c $(obj)/spnego_negtokeninit.asn1.h
>
> cifs-$(CONFIG_CIFS_XATTR) += xattr.o
>
> diff --git a/fs/cifs/asn1.c b/fs/cifs/asn1.c
> index 3150c19cdc2f..2db95fe3abfb 100644
> --- a/fs/cifs/asn1.c
> +++ b/fs/cifs/asn1.c
> @@ -1,612 +1,63 @@
> // SPDX-License-Identifier: GPL-2.0-or-later
> -/*
> - * The ASB.1/BER parsing code is derived from ip_nat_snmp_basic.c which was in
> - * turn derived from the gxsnmp package by Gregory McLean & Jochen Friedrich
> - *
> - * Copyright (c) 2000 RP Internet (www.rpi.net.au).
> - */
>
> #include <linux/module.h>
> -#include <linux/types.h>
> #include <linux/kernel.h>
> -#include <linux/mm.h>
> -#include <linux/slab.h>
> -#include "cifspdu.h"
> +#include <linux/oid_registry.h>
> #include "cifsglob.h"
> #include "cifs_debug.h"
> #include "cifsproto.h"
> +#include "spnego_negtokeninit.asn1.h"
>
> -/*****************************************************************************
> - *
> - * Basic ASN.1 decoding routines (gxsnmp author Dirk Wisse)
> - *
> - *****************************************************************************/
> -
> -/* Class */
> -#define ASN1_UNI 0 /* Universal */
> -#define ASN1_APL 1 /* Application */
> -#define ASN1_CTX 2 /* Context */
> -#define ASN1_PRV 3 /* Private */
> -
> -/* Tag */
> -#define ASN1_EOC 0 /* End Of Contents or N/A */
> -#define ASN1_BOL 1 /* Boolean */
> -#define ASN1_INT 2 /* Integer */
> -#define ASN1_BTS 3 /* Bit String */
> -#define ASN1_OTS 4 /* Octet String */
> -#define ASN1_NUL 5 /* Null */
> -#define ASN1_OJI 6 /* Object Identifier */
> -#define ASN1_OJD 7 /* Object Description */
> -#define ASN1_EXT 8 /* External */
> -#define ASN1_ENUM 10 /* Enumerated */
> -#define ASN1_SEQ 16 /* Sequence */
> -#define ASN1_SET 17 /* Set */
> -#define ASN1_NUMSTR 18 /* Numerical String */
> -#define ASN1_PRNSTR 19 /* Printable String */
> -#define ASN1_TEXSTR 20 /* Teletext String */
> -#define ASN1_VIDSTR 21 /* Video String */
> -#define ASN1_IA5STR 22 /* IA5 String */
> -#define ASN1_UNITIM 23 /* Universal Time */
> -#define ASN1_GENTIM 24 /* General Time */
> -#define ASN1_GRASTR 25 /* Graphical String */
> -#define ASN1_VISSTR 26 /* Visible String */
> -#define ASN1_GENSTR 27 /* General String */
> -
> -/* Primitive / Constructed methods*/
> -#define ASN1_PRI 0 /* Primitive */
> -#define ASN1_CON 1 /* Constructed */
> -
> -/*
> - * Error codes.
> - */
> -#define ASN1_ERR_NOERROR 0
> -#define ASN1_ERR_DEC_EMPTY 2
> -#define ASN1_ERR_DEC_EOC_MISMATCH 3
> -#define ASN1_ERR_DEC_LENGTH_MISMATCH 4
> -#define ASN1_ERR_DEC_BADVALUE 5
> -
> -#define SPNEGO_OID_LEN 7
> -#define NTLMSSP_OID_LEN 10
> -#define KRB5_OID_LEN 7
> -#define KRB5U2U_OID_LEN 8
> -#define MSKRB5_OID_LEN 7
> -static unsigned long SPNEGO_OID[7] = { 1, 3, 6, 1, 5, 5, 2 };
> -static unsigned long NTLMSSP_OID[10] = { 1, 3, 6, 1, 4, 1, 311, 2, 2, 10 };
> -static unsigned long KRB5_OID[7] = { 1, 2, 840, 113554, 1, 2, 2 };
> -static unsigned long KRB5U2U_OID[8] = { 1, 2, 840, 113554, 1, 2, 2, 3 };
> -static unsigned long MSKRB5_OID[7] = { 1, 2, 840, 48018, 1, 2, 2 };
> -
> -/*
> - * ASN.1 context.
> - */
> -struct asn1_ctx {
> - int error; /* Error condition */
> - unsigned char *pointer; /* Octet just to be decoded */
> - unsigned char *begin; /* First octet */
> - unsigned char *end; /* Octet after last octet */
> -};
> -
> -/*
> - * Octet string (not null terminated)
> - */
> -struct asn1_octstr {
> - unsigned char *data;
> - unsigned int len;
> -};
> -
> -static void
> -asn1_open(struct asn1_ctx *ctx, unsigned char *buf, unsigned int len)
> -{
> - ctx->begin = buf;
> - ctx->end = buf + len;
> - ctx->pointer = buf;
> - ctx->error = ASN1_ERR_NOERROR;
> -}
> -
> -static unsigned char
> -asn1_octet_decode(struct asn1_ctx *ctx, unsigned char *ch)
> -{
> - if (ctx->pointer >= ctx->end) {
> - ctx->error = ASN1_ERR_DEC_EMPTY;
> - return 0;
> - }
> - *ch = *(ctx->pointer)++;
> - return 1;
> -}
> -
> -#if 0 /* will be needed later by spnego decoding/encoding of ntlmssp */
> -static unsigned char
> -asn1_enum_decode(struct asn1_ctx *ctx, __le32 *val)
> -{
> - unsigned char ch;
> -
> - if (ctx->pointer >= ctx->end) {
> - ctx->error = ASN1_ERR_DEC_EMPTY;
> - return 0;
> - }
> -
> - ch = *(ctx->pointer)++; /* ch has 0xa, ptr points to length octet */
> - if ((ch) == ASN1_ENUM) /* if ch value is ENUM, 0xa */
> - *val = *(++(ctx->pointer)); /* value has enum value */
> - else
> - return 0;
> -
> - ctx->pointer++;
> - return 1;
> -}
> -#endif
> -
> -static unsigned char
> -asn1_tag_decode(struct asn1_ctx *ctx, unsigned int *tag)
> -{
> - unsigned char ch;
> -
> - *tag = 0;
> -
> - do {
> - if (!asn1_octet_decode(ctx, &ch))
> - return 0;
> - *tag <<= 7;
> - *tag |= ch & 0x7F;
> - } while ((ch & 0x80) == 0x80);
> - return 1;
> -}
> -
> -static unsigned char
> -asn1_id_decode(struct asn1_ctx *ctx,
> - unsigned int *cls, unsigned int *con, unsigned int *tag)
> -{
> - unsigned char ch;
> -
> - if (!asn1_octet_decode(ctx, &ch))
> - return 0;
> -
> - *cls = (ch & 0xC0) >> 6;
> - *con = (ch & 0x20) >> 5;
> - *tag = (ch & 0x1F);
> -
> - if (*tag == 0x1F) {
> - if (!asn1_tag_decode(ctx, tag))
> - return 0;
> - }
> - return 1;
> -}
> -
> -static unsigned char
> -asn1_length_decode(struct asn1_ctx *ctx, unsigned int *def, unsigned int *len)
> -{
> - unsigned char ch, cnt;
> -
> - if (!asn1_octet_decode(ctx, &ch))
> - return 0;
> -
> - if (ch == 0x80)
> - *def = 0;
> - else {
> - *def = 1;
> -
> - if (ch < 0x80)
> - *len = ch;
> - else {
> - cnt = (unsigned char) (ch & 0x7F);
> - *len = 0;
> -
> - while (cnt > 0) {
> - if (!asn1_octet_decode(ctx, &ch))
> - return 0;
> - *len <<= 8;
> - *len |= ch;
> - cnt--;
> - }
> - }
> - }
> -
> - /* don't trust len bigger than ctx buffer */
> - if (*len > ctx->end - ctx->pointer)
> - return 0;
> -
> - return 1;
> -}
> -
> -static unsigned char
> -asn1_header_decode(struct asn1_ctx *ctx,
> - unsigned char **eoc,
> - unsigned int *cls, unsigned int *con, unsigned int *tag)
> -{
> - unsigned int def = 0;
> - unsigned int len = 0;
> -
> - if (!asn1_id_decode(ctx, cls, con, tag))
> - return 0;
> -
> - if (!asn1_length_decode(ctx, &def, &len))
> - return 0;
> -
> - /* primitive shall be definite, indefinite shall be constructed */
> - if (*con == ASN1_PRI && !def)
> - return 0;
> -
> - if (def)
> - *eoc = ctx->pointer + len;
> - else
> - *eoc = NULL;
> - return 1;
> -}
> -
> -static unsigned char
> -asn1_eoc_decode(struct asn1_ctx *ctx, unsigned char *eoc)
> +int
> +decode_negTokenInit(unsigned char *security_blob, int length,
> + struct TCP_Server_Info *server)
> {
> - unsigned char ch;
> -
> - if (eoc == NULL) {
> - if (!asn1_octet_decode(ctx, &ch))
> - return 0;
> -
> - if (ch != 0x00) {
> - ctx->error = ASN1_ERR_DEC_EOC_MISMATCH;
> - return 0;
> - }
> -
> - if (!asn1_octet_decode(ctx, &ch))
> - return 0;
> -
> - if (ch != 0x00) {
> - ctx->error = ASN1_ERR_DEC_EOC_MISMATCH;
> - return 0;
> - }
> - return 1;
> - } else {
> - if (ctx->pointer != eoc) {
> - ctx->error = ASN1_ERR_DEC_LENGTH_MISMATCH;
> - return 0;
> - }
> + if (asn1_ber_decoder(&spnego_negtokeninit_decoder, server,
> + security_blob, length) == 0)
> return 1;
> - }
> -}
> -
> -/* static unsigned char asn1_null_decode(struct asn1_ctx *ctx,
> - unsigned char *eoc)
> -{
> - ctx->pointer = eoc;
> - return 1;
> -}
> -
> -static unsigned char asn1_long_decode(struct asn1_ctx *ctx,
> - unsigned char *eoc, long *integer)
> -{
> - unsigned char ch;
> - unsigned int len;
> -
> - if (!asn1_octet_decode(ctx, &ch))
> - return 0;
> -
> - *integer = (signed char) ch;
> - len = 1;
> -
> - while (ctx->pointer < eoc) {
> - if (++len > sizeof(long)) {
> - ctx->error = ASN1_ERR_DEC_BADVALUE;
> - return 0;
> - }
> -
> - if (!asn1_octet_decode(ctx, &ch))
> - return 0;
> -
> - *integer <<= 8;
> - *integer |= ch;
> - }
> - return 1;
> -}
> -
> -static unsigned char asn1_uint_decode(struct asn1_ctx *ctx,
> - unsigned char *eoc,
> - unsigned int *integer)
> -{
> - unsigned char ch;
> - unsigned int len;
> -
> - if (!asn1_octet_decode(ctx, &ch))
> - return 0;
> -
> - *integer = ch;
> - if (ch == 0)
> - len = 0;
> else
> - len = 1;
> -
> - while (ctx->pointer < eoc) {
> - if (++len > sizeof(unsigned int)) {
> - ctx->error = ASN1_ERR_DEC_BADVALUE;
> - return 0;
> - }
> -
> - if (!asn1_octet_decode(ctx, &ch))
> - return 0;
> -
> - *integer <<= 8;
> - *integer |= ch;
> - }
> - return 1;
> -}
> -
> -static unsigned char asn1_ulong_decode(struct asn1_ctx *ctx,
> - unsigned char *eoc,
> - unsigned long *integer)
> -{
> - unsigned char ch;
> - unsigned int len;
> -
> - if (!asn1_octet_decode(ctx, &ch))
> return 0;
> -
> - *integer = ch;
> - if (ch == 0)
> - len = 0;
> - else
> - len = 1;
> -
> - while (ctx->pointer < eoc) {
> - if (++len > sizeof(unsigned long)) {
> - ctx->error = ASN1_ERR_DEC_BADVALUE;
> - return 0;
> - }
> -
> - if (!asn1_octet_decode(ctx, &ch))
> - return 0;
> -
> - *integer <<= 8;
> - *integer |= ch;
> - }
> - return 1;
> }
>
> -static unsigned char
> -asn1_octets_decode(struct asn1_ctx *ctx,
> - unsigned char *eoc,
> - unsigned char **octets, unsigned int *len)
> +int gssapi_this_mech(void *context, size_t hdrlen,
> + unsigned char tag, const void *value, size_t vlen)
> {
> - unsigned char *ptr;
> -
> - *len = 0;
> -
> - *octets = kmalloc(eoc - ctx->pointer, GFP_ATOMIC);
> - if (*octets == NULL) {
> - return 0;
> - }
> -
> - ptr = *octets;
> - while (ctx->pointer < eoc) {
> - if (!asn1_octet_decode(ctx, (unsigned char *) ptr++)) {
> - kfree(*octets);
> - *octets = NULL;
> - return 0;
> - }
> - (*len)++;
> - }
> - return 1;
> -} */
> -
> -static unsigned char
> -asn1_subid_decode(struct asn1_ctx *ctx, unsigned long *subid)
> -{
> - unsigned char ch;
> -
> - *subid = 0;
> -
> - do {
> - if (!asn1_octet_decode(ctx, &ch))
> - return 0;
> -
> - *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;
> + enum OID oid;
>
> - while (ctx->pointer < eoc) {
> - if (++(*len) > size) {
> - ctx->error = ASN1_ERR_DEC_BADVALUE;
> - kfree(*oid);
> - *oid = NULL;
> - return 0;
> - }
> + oid = look_up_OID(value, vlen);
> + if (oid != OID_spnego) {
> + char buf[50];
>
> - if (!asn1_subid_decode(ctx, optr++)) {
> - kfree(*oid);
> - *oid = NULL;
> - return 0;
> - }
> + sprint_oid(value, vlen, buf, sizeof(buf));
> + cifs_dbg(FYI, "Error decoding negTokenInit header: unexpected OID %s\n",
> + buf);
> + return -EBADMSG;
> }
> - return 1;
> + return 0;
> }
>
> -static int
> -compare_oid(unsigned long *oid1, unsigned int oid1len,
> - unsigned long *oid2, unsigned int oid2len)
> +int neg_token_init_mech_type(void *context, size_t hdrlen,
> + unsigned char tag,
> + const void *value, size_t vlen)
> {
> - unsigned int i;
> + struct TCP_Server_Info *server = context;
> + enum OID oid;
>
> - if (oid1len != oid2len)
> - return 0;
> + oid = look_up_OID(value, vlen);
> + if (oid == OID_mskrb5)
> + server->sec_mskerberos = true;
> + else if (oid == OID_krb5u2u)
> + server->sec_kerberosu2u = true;
> + else if (oid == OID_krb5)
> + server->sec_kerberos = true;
> + else if (oid == OID_ntlmssp)
> + server->sec_ntlmssp = true;
> 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);
> + char buf[50];
>
> - /* 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;
> + sprint_oid(value, vlen, buf, sizeof(buf));
> + cifs_dbg(FYI, "Decoding negTokenInit: unsupported OID %s\n",
> + buf);
> }
> -
> - /* 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 exit 0\n",
> - cls, con, tag, 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 exit 1\n",
> - cls, con, tag, 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 exit 0\n",
> - cls, con, tag, 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 sequence_end = %p exit 1\n",
> - cls, con, tag, sequence_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;
> + return 0;
> }
> diff --git a/fs/cifs/spnego_negtokeninit.asn1 b/fs/cifs/spnego_negtokeninit.asn1
> new file mode 100644
> index 000000000000..aa5b4a61b3f5
> --- /dev/null
> +++ b/fs/cifs/spnego_negtokeninit.asn1
> @@ -0,0 +1,40 @@
> +GSSAPI ::=
> + [APPLICATION 0] IMPLICIT SEQUENCE {
> + thisMech
> + OBJECT IDENTIFIER ({gssapi_this_mech}),
> + negotiationToken
> + NegotiationToken
> + }
> +
> +MechType ::= OBJECT IDENTIFIER ({neg_token_init_mech_type})
> +
> +MechTypeList ::= SEQUENCE OF MechType
> +
> +NegHints ::= SEQUENCE {
> + hintName
> + [0] GeneralString OPTIONAL,
> + hintAddress
> + [1] OCTET STRING OPTIONAL
> + }
> +
> +NegTokenInit2 ::=
> + SEQUENCE {
> + mechTypes
> + [0] MechTypeList OPTIONAL,
> + reqFlags
> + [1] BIT STRING OPTIONAL,
> + mechToken
> + [2] OCTET STRING OPTIONAL,
> + negHints
> + [3] NegHints OPTIONAL,
> + mechListMIC
> + [3] OCTET STRING OPTIONAL
> + }
> +
> +NegotiationToken ::=
> + CHOICE {
> + negTokenInit
> + [0] NegTokenInit2,
> + negTokenTarg
> + [1] ANY
> + }
> diff --git a/include/linux/oid_registry.h b/include/linux/oid_registry.h
> index 461b7aa587ba..3d8db1f6a5db 100644
> --- a/include/linux/oid_registry.h
> +++ b/include/linux/oid_registry.h
> @@ -54,6 +54,10 @@ enum OID {
> OID_md4, /* 1.2.840.113549.2.4 */
> OID_md5, /* 1.2.840.113549.2.5 */
>
> + OID_mskrb5, /* 1.2.840.48018.1.2.2 */
> + OID_krb5, /* 1.2.840.113554.1.2.2 */
> + OID_krb5u2u, /* 1.2.840.113554.1.2.2.3 */
> +
> /* Microsoft Authenticode & Software Publishing */
> OID_msIndirectData, /* 1.3.6.1.4.1.311.2.1.4 */
> OID_msStatementType, /* 1.3.6.1.4.1.311.2.1.11 */
> @@ -62,6 +66,10 @@ enum OID {
> OID_msIndividualSPKeyPurpose, /* 1.3.6.1.4.1.311.2.1.21 */
> OID_msOutlookExpress, /* 1.3.6.1.4.1.311.16.4 */
>
> + OID_ntlmssp, /* 1.3.6.1.4.1.311.2.2.10 */
> +
> + OID_spnego, /* 1.3.6.1.5.5.2 */
> +
> OID_certAuthInfoAccess, /* 1.3.6.1.5.5.7.1.1 */
> OID_sha1, /* 1.3.14.3.2.26 */
> OID_id_ansip384r1, /* 1.3.132.0.34 */
> --
> 2.25.1
>
2021년 6월 6일 (일) 오후 4:11, Steve French <smfrench@gmail.com>님이 작성: > > "make M=fs/cifs" from the top of the kernel tree worked, but my usual > script failed > > "cd fs/cifs" > then > "make C=1 -C /usr/src/linux-headers-`uname -r` M=`pwd` modules > CF=-D__CHECK_ENDIAN__" > > failed with (even after generating the files with the "make M=fs/cifs" earlier): > > ASN.1 /home/smfrench/cifs-2.6/fs/cifs/spnego_negtokeninit.asn1.[ch] > CC [M] /home/smfrench/cifs-2.6/fs/cifs/asn1.o > /home/smfrench/cifs-2.6/fs/cifs/asn1.c: In function ‘gssapi_this_mech’: > /home/smfrench/cifs-2.6/fs/cifs/asn1.c:28:13: error: ‘OID_spnego’ > undeclared (first use in this function) > 28 | if (oid != OID_spnego) { > | ^~~~~~~~~~ Because this patch have added some enum constants such as OID_spnego into include/linux/oid_registry.h, compiling cifs with new linux headers is needed. Thanks, Hyunchul > /home/smfrench/cifs-2.6/fs/cifs/asn1.c:28:13: note: each undeclared > identifier is reported only once for each function it appears in > /home/smfrench/cifs-2.6/fs/cifs/asn1.c: In function ‘neg_token_init_mech_type’: > /home/smfrench/cifs-2.6/fs/cifs/asn1.c:47:13: error: ‘OID_mskrb5’ > undeclared (first use in this function); did you mean ‘OID_md5’? > 47 | if (oid == OID_mskrb5) > | ^~~~~~~~~~ > | OID_md5 > /home/smfrench/cifs-2.6/fs/cifs/asn1.c:49:18: error: ‘OID_krb5u2u’ > undeclared (first use in this function) > 49 | else if (oid == OID_krb5u2u) > | ^~~~~~~~~~~ > /home/smfrench/cifs-2.6/fs/cifs/asn1.c:51:18: error: ‘OID_krb5’ > undeclared (first use in this function) > 51 | else if (oid == OID_krb5) > | ^~~~~~~~ > /home/smfrench/cifs-2.6/fs/cifs/asn1.c:53:18: error: ‘OID_ntlmssp’ > undeclared (first use in this function) > 53 | else if (oid == OID_ntlmssp) > | ^~~~~~~~~~~ > make[1]: *** [scripts/Makefile.build:272: > /home/smfrench/cifs-2.6/fs/cifs/asn1.o] Error 1 > make: *** [Makefile:1845: /home/smfrench/cifs-2.6/fs/cifs] Error 2 > make: Leaving directory > '/usr/src/linux-headers-5.13.0-051300rc3daily20210526-generic > > On Sat, Jun 5, 2021 at 8:07 PM Hyunchul Lee <hyc.lee@gmail.com> wrote: > > > > 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> > > --- > > changes from v3: > > - Change Makefile to fix a compile error, "spnego_negtokeninit.asn1.h: No such file or directory". > > changes from v2: > > - Change Makefile to fix a compile error(kernel test bot). > > - Add cifsproto.h into asn1.c to fix a compile warning(kernel test bot). > > chnages from v1: > > - Select CONFIG_OID_REGISTRY > > > > fs/cifs/Kconfig | 2 + > > fs/cifs/Makefile | 8 +- > > fs/cifs/asn1.c | 623 ++----------------------------- > > fs/cifs/spnego_negtokeninit.asn1 | 40 ++ > > include/linux/oid_registry.h | 8 + > > 5 files changed, 93 insertions(+), 588 deletions(-) > > create mode 100644 fs/cifs/spnego_negtokeninit.asn1 > > > > diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig > > index bf52e9326ebe..7de5c893c181 100644 > > --- a/fs/cifs/Kconfig > > +++ b/fs/cifs/Kconfig > > @@ -19,6 +19,8 @@ config CIFS > > select CRYPTO_LIB_DES > > select KEYS > > select DNS_RESOLVER > > + select ASN1 > > + select OID_REGISTRY > > help > > This is the client VFS module for the SMB3 family of NAS protocols, > > (including support for the most recent, most secure dialect SMB3.1.1) > > diff --git a/fs/cifs/Makefile b/fs/cifs/Makefile > > index 3ee3b7de4ded..9d877eafd350 100644 > > --- a/fs/cifs/Makefile > > +++ b/fs/cifs/Makefile > > @@ -6,12 +6,16 @@ ccflags-y += -I$(src) # needed for trace events > > obj-$(CONFIG_CIFS) += cifs.o > > > > cifs-y := trace.o cifsfs.o cifssmb.o cifs_debug.o connect.o dir.o file.o \ > > - inode.o link.o misc.o netmisc.o smbencrypt.o transport.o asn1.o \ > > + inode.o link.o misc.o netmisc.o smbencrypt.o transport.o \ > > cifs_unicode.o nterr.o cifsencrypt.o \ > > readdir.o ioctl.o sess.o export.o smb1ops.o unc.o winucase.o \ > > smb2ops.o smb2maperror.o smb2transport.o \ > > smb2misc.o smb2pdu.o smb2inode.o smb2file.o cifsacl.o fs_context.o \ > > - dns_resolve.o > > + dns_resolve.o spnego_negtokeninit.asn1.o asn1.o > > + > > +$(obj)/asn1.o: $(obj)/spnego_negtokeninit.asn1.h > > + > > +$(obj)/spnego_negtokeninit.asn1.o: $(obj)/spnego_negtokeninit.asn1.c $(obj)/spnego_negtokeninit.asn1.h > > > > cifs-$(CONFIG_CIFS_XATTR) += xattr.o > > > > diff --git a/fs/cifs/asn1.c b/fs/cifs/asn1.c > > index 3150c19cdc2f..2db95fe3abfb 100644 > > --- a/fs/cifs/asn1.c > > +++ b/fs/cifs/asn1.c > > @@ -1,612 +1,63 @@ > > // SPDX-License-Identifier: GPL-2.0-or-later > > -/* > > - * The ASB.1/BER parsing code is derived from ip_nat_snmp_basic.c which was in > > - * turn derived from the gxsnmp package by Gregory McLean & Jochen Friedrich > > - * > > - * Copyright (c) 2000 RP Internet (www.rpi.net.au). > > - */ > > > > #include <linux/module.h> > > -#include <linux/types.h> > > #include <linux/kernel.h> > > -#include <linux/mm.h> > > -#include <linux/slab.h> > > -#include "cifspdu.h" > > +#include <linux/oid_registry.h> > > #include "cifsglob.h" > > #include "cifs_debug.h" > > #include "cifsproto.h" > > +#include "spnego_negtokeninit.asn1.h" > > > > -/***************************************************************************** > > - * > > - * Basic ASN.1 decoding routines (gxsnmp author Dirk Wisse) > > - * > > - *****************************************************************************/ > > - > > -/* Class */ > > -#define ASN1_UNI 0 /* Universal */ > > -#define ASN1_APL 1 /* Application */ > > -#define ASN1_CTX 2 /* Context */ > > -#define ASN1_PRV 3 /* Private */ > > - > > -/* Tag */ > > -#define ASN1_EOC 0 /* End Of Contents or N/A */ > > -#define ASN1_BOL 1 /* Boolean */ > > -#define ASN1_INT 2 /* Integer */ > > -#define ASN1_BTS 3 /* Bit String */ > > -#define ASN1_OTS 4 /* Octet String */ > > -#define ASN1_NUL 5 /* Null */ > > -#define ASN1_OJI 6 /* Object Identifier */ > > -#define ASN1_OJD 7 /* Object Description */ > > -#define ASN1_EXT 8 /* External */ > > -#define ASN1_ENUM 10 /* Enumerated */ > > -#define ASN1_SEQ 16 /* Sequence */ > > -#define ASN1_SET 17 /* Set */ > > -#define ASN1_NUMSTR 18 /* Numerical String */ > > -#define ASN1_PRNSTR 19 /* Printable String */ > > -#define ASN1_TEXSTR 20 /* Teletext String */ > > -#define ASN1_VIDSTR 21 /* Video String */ > > -#define ASN1_IA5STR 22 /* IA5 String */ > > -#define ASN1_UNITIM 23 /* Universal Time */ > > -#define ASN1_GENTIM 24 /* General Time */ > > -#define ASN1_GRASTR 25 /* Graphical String */ > > -#define ASN1_VISSTR 26 /* Visible String */ > > -#define ASN1_GENSTR 27 /* General String */ > > - > > -/* Primitive / Constructed methods*/ > > -#define ASN1_PRI 0 /* Primitive */ > > -#define ASN1_CON 1 /* Constructed */ > > - > > -/* > > - * Error codes. > > - */ > > -#define ASN1_ERR_NOERROR 0 > > -#define ASN1_ERR_DEC_EMPTY 2 > > -#define ASN1_ERR_DEC_EOC_MISMATCH 3 > > -#define ASN1_ERR_DEC_LENGTH_MISMATCH 4 > > -#define ASN1_ERR_DEC_BADVALUE 5 > > - > > -#define SPNEGO_OID_LEN 7 > > -#define NTLMSSP_OID_LEN 10 > > -#define KRB5_OID_LEN 7 > > -#define KRB5U2U_OID_LEN 8 > > -#define MSKRB5_OID_LEN 7 > > -static unsigned long SPNEGO_OID[7] = { 1, 3, 6, 1, 5, 5, 2 }; > > -static unsigned long NTLMSSP_OID[10] = { 1, 3, 6, 1, 4, 1, 311, 2, 2, 10 }; > > -static unsigned long KRB5_OID[7] = { 1, 2, 840, 113554, 1, 2, 2 }; > > -static unsigned long KRB5U2U_OID[8] = { 1, 2, 840, 113554, 1, 2, 2, 3 }; > > -static unsigned long MSKRB5_OID[7] = { 1, 2, 840, 48018, 1, 2, 2 }; > > - > > -/* > > - * ASN.1 context. > > - */ > > -struct asn1_ctx { > > - int error; /* Error condition */ > > - unsigned char *pointer; /* Octet just to be decoded */ > > - unsigned char *begin; /* First octet */ > > - unsigned char *end; /* Octet after last octet */ > > -}; > > - > > -/* > > - * Octet string (not null terminated) > > - */ > > -struct asn1_octstr { > > - unsigned char *data; > > - unsigned int len; > > -}; > > - > > -static void > > -asn1_open(struct asn1_ctx *ctx, unsigned char *buf, unsigned int len) > > -{ > > - ctx->begin = buf; > > - ctx->end = buf + len; > > - ctx->pointer = buf; > > - ctx->error = ASN1_ERR_NOERROR; > > -} > > - > > -static unsigned char > > -asn1_octet_decode(struct asn1_ctx *ctx, unsigned char *ch) > > -{ > > - if (ctx->pointer >= ctx->end) { > > - ctx->error = ASN1_ERR_DEC_EMPTY; > > - return 0; > > - } > > - *ch = *(ctx->pointer)++; > > - return 1; > > -} > > - > > -#if 0 /* will be needed later by spnego decoding/encoding of ntlmssp */ > > -static unsigned char > > -asn1_enum_decode(struct asn1_ctx *ctx, __le32 *val) > > -{ > > - unsigned char ch; > > - > > - if (ctx->pointer >= ctx->end) { > > - ctx->error = ASN1_ERR_DEC_EMPTY; > > - return 0; > > - } > > - > > - ch = *(ctx->pointer)++; /* ch has 0xa, ptr points to length octet */ > > - if ((ch) == ASN1_ENUM) /* if ch value is ENUM, 0xa */ > > - *val = *(++(ctx->pointer)); /* value has enum value */ > > - else > > - return 0; > > - > > - ctx->pointer++; > > - return 1; > > -} > > -#endif > > - > > -static unsigned char > > -asn1_tag_decode(struct asn1_ctx *ctx, unsigned int *tag) > > -{ > > - unsigned char ch; > > - > > - *tag = 0; > > - > > - do { > > - if (!asn1_octet_decode(ctx, &ch)) > > - return 0; > > - *tag <<= 7; > > - *tag |= ch & 0x7F; > > - } while ((ch & 0x80) == 0x80); > > - return 1; > > -} > > - > > -static unsigned char > > -asn1_id_decode(struct asn1_ctx *ctx, > > - unsigned int *cls, unsigned int *con, unsigned int *tag) > > -{ > > - unsigned char ch; > > - > > - if (!asn1_octet_decode(ctx, &ch)) > > - return 0; > > - > > - *cls = (ch & 0xC0) >> 6; > > - *con = (ch & 0x20) >> 5; > > - *tag = (ch & 0x1F); > > - > > - if (*tag == 0x1F) { > > - if (!asn1_tag_decode(ctx, tag)) > > - return 0; > > - } > > - return 1; > > -} > > - > > -static unsigned char > > -asn1_length_decode(struct asn1_ctx *ctx, unsigned int *def, unsigned int *len) > > -{ > > - unsigned char ch, cnt; > > - > > - if (!asn1_octet_decode(ctx, &ch)) > > - return 0; > > - > > - if (ch == 0x80) > > - *def = 0; > > - else { > > - *def = 1; > > - > > - if (ch < 0x80) > > - *len = ch; > > - else { > > - cnt = (unsigned char) (ch & 0x7F); > > - *len = 0; > > - > > - while (cnt > 0) { > > - if (!asn1_octet_decode(ctx, &ch)) > > - return 0; > > - *len <<= 8; > > - *len |= ch; > > - cnt--; > > - } > > - } > > - } > > - > > - /* don't trust len bigger than ctx buffer */ > > - if (*len > ctx->end - ctx->pointer) > > - return 0; > > - > > - return 1; > > -} > > - > > -static unsigned char > > -asn1_header_decode(struct asn1_ctx *ctx, > > - unsigned char **eoc, > > - unsigned int *cls, unsigned int *con, unsigned int *tag) > > -{ > > - unsigned int def = 0; > > - unsigned int len = 0; > > - > > - if (!asn1_id_decode(ctx, cls, con, tag)) > > - return 0; > > - > > - if (!asn1_length_decode(ctx, &def, &len)) > > - return 0; > > - > > - /* primitive shall be definite, indefinite shall be constructed */ > > - if (*con == ASN1_PRI && !def) > > - return 0; > > - > > - if (def) > > - *eoc = ctx->pointer + len; > > - else > > - *eoc = NULL; > > - return 1; > > -} > > - > > -static unsigned char > > -asn1_eoc_decode(struct asn1_ctx *ctx, unsigned char *eoc) > > +int > > +decode_negTokenInit(unsigned char *security_blob, int length, > > + struct TCP_Server_Info *server) > > { > > - unsigned char ch; > > - > > - if (eoc == NULL) { > > - if (!asn1_octet_decode(ctx, &ch)) > > - return 0; > > - > > - if (ch != 0x00) { > > - ctx->error = ASN1_ERR_DEC_EOC_MISMATCH; > > - return 0; > > - } > > - > > - if (!asn1_octet_decode(ctx, &ch)) > > - return 0; > > - > > - if (ch != 0x00) { > > - ctx->error = ASN1_ERR_DEC_EOC_MISMATCH; > > - return 0; > > - } > > - return 1; > > - } else { > > - if (ctx->pointer != eoc) { > > - ctx->error = ASN1_ERR_DEC_LENGTH_MISMATCH; > > - return 0; > > - } > > + if (asn1_ber_decoder(&spnego_negtokeninit_decoder, server, > > + security_blob, length) == 0) > > return 1; > > - } > > -} > > - > > -/* static unsigned char asn1_null_decode(struct asn1_ctx *ctx, > > - unsigned char *eoc) > > -{ > > - ctx->pointer = eoc; > > - return 1; > > -} > > - > > -static unsigned char asn1_long_decode(struct asn1_ctx *ctx, > > - unsigned char *eoc, long *integer) > > -{ > > - unsigned char ch; > > - unsigned int len; > > - > > - if (!asn1_octet_decode(ctx, &ch)) > > - return 0; > > - > > - *integer = (signed char) ch; > > - len = 1; > > - > > - while (ctx->pointer < eoc) { > > - if (++len > sizeof(long)) { > > - ctx->error = ASN1_ERR_DEC_BADVALUE; > > - return 0; > > - } > > - > > - if (!asn1_octet_decode(ctx, &ch)) > > - return 0; > > - > > - *integer <<= 8; > > - *integer |= ch; > > - } > > - return 1; > > -} > > - > > -static unsigned char asn1_uint_decode(struct asn1_ctx *ctx, > > - unsigned char *eoc, > > - unsigned int *integer) > > -{ > > - unsigned char ch; > > - unsigned int len; > > - > > - if (!asn1_octet_decode(ctx, &ch)) > > - return 0; > > - > > - *integer = ch; > > - if (ch == 0) > > - len = 0; > > else > > - len = 1; > > - > > - while (ctx->pointer < eoc) { > > - if (++len > sizeof(unsigned int)) { > > - ctx->error = ASN1_ERR_DEC_BADVALUE; > > - return 0; > > - } > > - > > - if (!asn1_octet_decode(ctx, &ch)) > > - return 0; > > - > > - *integer <<= 8; > > - *integer |= ch; > > - } > > - return 1; > > -} > > - > > -static unsigned char asn1_ulong_decode(struct asn1_ctx *ctx, > > - unsigned char *eoc, > > - unsigned long *integer) > > -{ > > - unsigned char ch; > > - unsigned int len; > > - > > - if (!asn1_octet_decode(ctx, &ch)) > > return 0; > > - > > - *integer = ch; > > - if (ch == 0) > > - len = 0; > > - else > > - len = 1; > > - > > - while (ctx->pointer < eoc) { > > - if (++len > sizeof(unsigned long)) { > > - ctx->error = ASN1_ERR_DEC_BADVALUE; > > - return 0; > > - } > > - > > - if (!asn1_octet_decode(ctx, &ch)) > > - return 0; > > - > > - *integer <<= 8; > > - *integer |= ch; > > - } > > - return 1; > > } > > > > -static unsigned char > > -asn1_octets_decode(struct asn1_ctx *ctx, > > - unsigned char *eoc, > > - unsigned char **octets, unsigned int *len) > > +int gssapi_this_mech(void *context, size_t hdrlen, > > + unsigned char tag, const void *value, size_t vlen) > > { > > - unsigned char *ptr; > > - > > - *len = 0; > > - > > - *octets = kmalloc(eoc - ctx->pointer, GFP_ATOMIC); > > - if (*octets == NULL) { > > - return 0; > > - } > > - > > - ptr = *octets; > > - while (ctx->pointer < eoc) { > > - if (!asn1_octet_decode(ctx, (unsigned char *) ptr++)) { > > - kfree(*octets); > > - *octets = NULL; > > - return 0; > > - } > > - (*len)++; > > - } > > - return 1; > > -} */ > > - > > -static unsigned char > > -asn1_subid_decode(struct asn1_ctx *ctx, unsigned long *subid) > > -{ > > - unsigned char ch; > > - > > - *subid = 0; > > - > > - do { > > - if (!asn1_octet_decode(ctx, &ch)) > > - return 0; > > - > > - *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; > > + enum OID oid; > > > > - while (ctx->pointer < eoc) { > > - if (++(*len) > size) { > > - ctx->error = ASN1_ERR_DEC_BADVALUE; > > - kfree(*oid); > > - *oid = NULL; > > - return 0; > > - } > > + oid = look_up_OID(value, vlen); > > + if (oid != OID_spnego) { > > + char buf[50]; > > > > - if (!asn1_subid_decode(ctx, optr++)) { > > - kfree(*oid); > > - *oid = NULL; > > - return 0; > > - } > > + sprint_oid(value, vlen, buf, sizeof(buf)); > > + cifs_dbg(FYI, "Error decoding negTokenInit header: unexpected OID %s\n", > > + buf); > > + return -EBADMSG; > > } > > - return 1; > > + return 0; > > } > > > > -static int > > -compare_oid(unsigned long *oid1, unsigned int oid1len, > > - unsigned long *oid2, unsigned int oid2len) > > +int neg_token_init_mech_type(void *context, size_t hdrlen, > > + unsigned char tag, > > + const void *value, size_t vlen) > > { > > - unsigned int i; > > + struct TCP_Server_Info *server = context; > > + enum OID oid; > > > > - if (oid1len != oid2len) > > - return 0; > > + oid = look_up_OID(value, vlen); > > + if (oid == OID_mskrb5) > > + server->sec_mskerberos = true; > > + else if (oid == OID_krb5u2u) > > + server->sec_kerberosu2u = true; > > + else if (oid == OID_krb5) > > + server->sec_kerberos = true; > > + else if (oid == OID_ntlmssp) > > + server->sec_ntlmssp = true; > > 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); > > + char buf[50]; > > > > - /* 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; > > + sprint_oid(value, vlen, buf, sizeof(buf)); > > + cifs_dbg(FYI, "Decoding negTokenInit: unsupported OID %s\n", > > + buf); > > } > > - > > - /* 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 exit 0\n", > > - cls, con, tag, 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 exit 1\n", > > - cls, con, tag, 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 exit 0\n", > > - cls, con, tag, 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 sequence_end = %p exit 1\n", > > - cls, con, tag, sequence_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; > > + return 0; > > } > > diff --git a/fs/cifs/spnego_negtokeninit.asn1 b/fs/cifs/spnego_negtokeninit.asn1 > > new file mode 100644 > > index 000000000000..aa5b4a61b3f5 > > --- /dev/null > > +++ b/fs/cifs/spnego_negtokeninit.asn1 > > @@ -0,0 +1,40 @@ > > +GSSAPI ::= > > + [APPLICATION 0] IMPLICIT SEQUENCE { > > + thisMech > > + OBJECT IDENTIFIER ({gssapi_this_mech}), > > + negotiationToken > > + NegotiationToken > > + } > > + > > +MechType ::= OBJECT IDENTIFIER ({neg_token_init_mech_type}) > > + > > +MechTypeList ::= SEQUENCE OF MechType > > + > > +NegHints ::= SEQUENCE { > > + hintName > > + [0] GeneralString OPTIONAL, > > + hintAddress > > + [1] OCTET STRING OPTIONAL > > + } > > + > > +NegTokenInit2 ::= > > + SEQUENCE { > > + mechTypes > > + [0] MechTypeList OPTIONAL, > > + reqFlags > > + [1] BIT STRING OPTIONAL, > > + mechToken > > + [2] OCTET STRING OPTIONAL, > > + negHints > > + [3] NegHints OPTIONAL, > > + mechListMIC > > + [3] OCTET STRING OPTIONAL > > + } > > + > > +NegotiationToken ::= > > + CHOICE { > > + negTokenInit > > + [0] NegTokenInit2, > > + negTokenTarg > > + [1] ANY > > + } > > diff --git a/include/linux/oid_registry.h b/include/linux/oid_registry.h > > index 461b7aa587ba..3d8db1f6a5db 100644 > > --- a/include/linux/oid_registry.h > > +++ b/include/linux/oid_registry.h > > @@ -54,6 +54,10 @@ enum OID { > > OID_md4, /* 1.2.840.113549.2.4 */ > > OID_md5, /* 1.2.840.113549.2.5 */ > > > > + OID_mskrb5, /* 1.2.840.48018.1.2.2 */ > > + OID_krb5, /* 1.2.840.113554.1.2.2 */ > > + OID_krb5u2u, /* 1.2.840.113554.1.2.2.3 */ > > + > > /* Microsoft Authenticode & Software Publishing */ > > OID_msIndirectData, /* 1.3.6.1.4.1.311.2.1.4 */ > > OID_msStatementType, /* 1.3.6.1.4.1.311.2.1.11 */ > > @@ -62,6 +66,10 @@ enum OID { > > OID_msIndividualSPKeyPurpose, /* 1.3.6.1.4.1.311.2.1.21 */ > > OID_msOutlookExpress, /* 1.3.6.1.4.1.311.16.4 */ > > > > + OID_ntlmssp, /* 1.3.6.1.4.1.311.2.2.10 */ > > + > > + OID_spnego, /* 1.3.6.1.5.5.2 */ > > + > > OID_certAuthInfoAccess, /* 1.3.6.1.5.5.7.1.1 */ > > OID_sha1, /* 1.3.14.3.2.26 */ > > OID_id_ansip384r1, /* 1.3.132.0.34 */ > > -- > > 2.25.1 > > > > > -- > Thanks, > > Steve
diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig index bf52e9326ebe..7de5c893c181 100644 --- a/fs/cifs/Kconfig +++ b/fs/cifs/Kconfig @@ -19,6 +19,8 @@ config CIFS select CRYPTO_LIB_DES select KEYS select DNS_RESOLVER + select ASN1 + select OID_REGISTRY help This is the client VFS module for the SMB3 family of NAS protocols, (including support for the most recent, most secure dialect SMB3.1.1) diff --git a/fs/cifs/Makefile b/fs/cifs/Makefile index 3ee3b7de4ded..9d877eafd350 100644 --- a/fs/cifs/Makefile +++ b/fs/cifs/Makefile @@ -6,12 +6,16 @@ ccflags-y += -I$(src) # needed for trace events obj-$(CONFIG_CIFS) += cifs.o cifs-y := trace.o cifsfs.o cifssmb.o cifs_debug.o connect.o dir.o file.o \ - inode.o link.o misc.o netmisc.o smbencrypt.o transport.o asn1.o \ + inode.o link.o misc.o netmisc.o smbencrypt.o transport.o \ cifs_unicode.o nterr.o cifsencrypt.o \ readdir.o ioctl.o sess.o export.o smb1ops.o unc.o winucase.o \ smb2ops.o smb2maperror.o smb2transport.o \ smb2misc.o smb2pdu.o smb2inode.o smb2file.o cifsacl.o fs_context.o \ - dns_resolve.o + dns_resolve.o spnego_negtokeninit.asn1.o asn1.o + +$(obj)/asn1.o: $(obj)/spnego_negtokeninit.asn1.h + +$(obj)/spnego_negtokeninit.asn1.o: $(obj)/spnego_negtokeninit.asn1.c $(obj)/spnego_negtokeninit.asn1.h cifs-$(CONFIG_CIFS_XATTR) += xattr.o diff --git a/fs/cifs/asn1.c b/fs/cifs/asn1.c index 3150c19cdc2f..2db95fe3abfb 100644 --- a/fs/cifs/asn1.c +++ b/fs/cifs/asn1.c @@ -1,612 +1,63 @@ // SPDX-License-Identifier: GPL-2.0-or-later -/* - * The ASB.1/BER parsing code is derived from ip_nat_snmp_basic.c which was in - * turn derived from the gxsnmp package by Gregory McLean & Jochen Friedrich - * - * Copyright (c) 2000 RP Internet (www.rpi.net.au). - */ #include <linux/module.h> -#include <linux/types.h> #include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/slab.h> -#include "cifspdu.h" +#include <linux/oid_registry.h> #include "cifsglob.h" #include "cifs_debug.h" #include "cifsproto.h" +#include "spnego_negtokeninit.asn1.h" -/***************************************************************************** - * - * Basic ASN.1 decoding routines (gxsnmp author Dirk Wisse) - * - *****************************************************************************/ - -/* Class */ -#define ASN1_UNI 0 /* Universal */ -#define ASN1_APL 1 /* Application */ -#define ASN1_CTX 2 /* Context */ -#define ASN1_PRV 3 /* Private */ - -/* Tag */ -#define ASN1_EOC 0 /* End Of Contents or N/A */ -#define ASN1_BOL 1 /* Boolean */ -#define ASN1_INT 2 /* Integer */ -#define ASN1_BTS 3 /* Bit String */ -#define ASN1_OTS 4 /* Octet String */ -#define ASN1_NUL 5 /* Null */ -#define ASN1_OJI 6 /* Object Identifier */ -#define ASN1_OJD 7 /* Object Description */ -#define ASN1_EXT 8 /* External */ -#define ASN1_ENUM 10 /* Enumerated */ -#define ASN1_SEQ 16 /* Sequence */ -#define ASN1_SET 17 /* Set */ -#define ASN1_NUMSTR 18 /* Numerical String */ -#define ASN1_PRNSTR 19 /* Printable String */ -#define ASN1_TEXSTR 20 /* Teletext String */ -#define ASN1_VIDSTR 21 /* Video String */ -#define ASN1_IA5STR 22 /* IA5 String */ -#define ASN1_UNITIM 23 /* Universal Time */ -#define ASN1_GENTIM 24 /* General Time */ -#define ASN1_GRASTR 25 /* Graphical String */ -#define ASN1_VISSTR 26 /* Visible String */ -#define ASN1_GENSTR 27 /* General String */ - -/* Primitive / Constructed methods*/ -#define ASN1_PRI 0 /* Primitive */ -#define ASN1_CON 1 /* Constructed */ - -/* - * Error codes. - */ -#define ASN1_ERR_NOERROR 0 -#define ASN1_ERR_DEC_EMPTY 2 -#define ASN1_ERR_DEC_EOC_MISMATCH 3 -#define ASN1_ERR_DEC_LENGTH_MISMATCH 4 -#define ASN1_ERR_DEC_BADVALUE 5 - -#define SPNEGO_OID_LEN 7 -#define NTLMSSP_OID_LEN 10 -#define KRB5_OID_LEN 7 -#define KRB5U2U_OID_LEN 8 -#define MSKRB5_OID_LEN 7 -static unsigned long SPNEGO_OID[7] = { 1, 3, 6, 1, 5, 5, 2 }; -static unsigned long NTLMSSP_OID[10] = { 1, 3, 6, 1, 4, 1, 311, 2, 2, 10 }; -static unsigned long KRB5_OID[7] = { 1, 2, 840, 113554, 1, 2, 2 }; -static unsigned long KRB5U2U_OID[8] = { 1, 2, 840, 113554, 1, 2, 2, 3 }; -static unsigned long MSKRB5_OID[7] = { 1, 2, 840, 48018, 1, 2, 2 }; - -/* - * ASN.1 context. - */ -struct asn1_ctx { - int error; /* Error condition */ - unsigned char *pointer; /* Octet just to be decoded */ - unsigned char *begin; /* First octet */ - unsigned char *end; /* Octet after last octet */ -}; - -/* - * Octet string (not null terminated) - */ -struct asn1_octstr { - unsigned char *data; - unsigned int len; -}; - -static void -asn1_open(struct asn1_ctx *ctx, unsigned char *buf, unsigned int len) -{ - ctx->begin = buf; - ctx->end = buf + len; - ctx->pointer = buf; - ctx->error = ASN1_ERR_NOERROR; -} - -static unsigned char -asn1_octet_decode(struct asn1_ctx *ctx, unsigned char *ch) -{ - if (ctx->pointer >= ctx->end) { - ctx->error = ASN1_ERR_DEC_EMPTY; - return 0; - } - *ch = *(ctx->pointer)++; - return 1; -} - -#if 0 /* will be needed later by spnego decoding/encoding of ntlmssp */ -static unsigned char -asn1_enum_decode(struct asn1_ctx *ctx, __le32 *val) -{ - unsigned char ch; - - if (ctx->pointer >= ctx->end) { - ctx->error = ASN1_ERR_DEC_EMPTY; - return 0; - } - - ch = *(ctx->pointer)++; /* ch has 0xa, ptr points to length octet */ - if ((ch) == ASN1_ENUM) /* if ch value is ENUM, 0xa */ - *val = *(++(ctx->pointer)); /* value has enum value */ - else - return 0; - - ctx->pointer++; - return 1; -} -#endif - -static unsigned char -asn1_tag_decode(struct asn1_ctx *ctx, unsigned int *tag) -{ - unsigned char ch; - - *tag = 0; - - do { - if (!asn1_octet_decode(ctx, &ch)) - return 0; - *tag <<= 7; - *tag |= ch & 0x7F; - } while ((ch & 0x80) == 0x80); - return 1; -} - -static unsigned char -asn1_id_decode(struct asn1_ctx *ctx, - unsigned int *cls, unsigned int *con, unsigned int *tag) -{ - unsigned char ch; - - if (!asn1_octet_decode(ctx, &ch)) - return 0; - - *cls = (ch & 0xC0) >> 6; - *con = (ch & 0x20) >> 5; - *tag = (ch & 0x1F); - - if (*tag == 0x1F) { - if (!asn1_tag_decode(ctx, tag)) - return 0; - } - return 1; -} - -static unsigned char -asn1_length_decode(struct asn1_ctx *ctx, unsigned int *def, unsigned int *len) -{ - unsigned char ch, cnt; - - if (!asn1_octet_decode(ctx, &ch)) - return 0; - - if (ch == 0x80) - *def = 0; - else { - *def = 1; - - if (ch < 0x80) - *len = ch; - else { - cnt = (unsigned char) (ch & 0x7F); - *len = 0; - - while (cnt > 0) { - if (!asn1_octet_decode(ctx, &ch)) - return 0; - *len <<= 8; - *len |= ch; - cnt--; - } - } - } - - /* don't trust len bigger than ctx buffer */ - if (*len > ctx->end - ctx->pointer) - return 0; - - return 1; -} - -static unsigned char -asn1_header_decode(struct asn1_ctx *ctx, - unsigned char **eoc, - unsigned int *cls, unsigned int *con, unsigned int *tag) -{ - unsigned int def = 0; - unsigned int len = 0; - - if (!asn1_id_decode(ctx, cls, con, tag)) - return 0; - - if (!asn1_length_decode(ctx, &def, &len)) - return 0; - - /* primitive shall be definite, indefinite shall be constructed */ - if (*con == ASN1_PRI && !def) - return 0; - - if (def) - *eoc = ctx->pointer + len; - else - *eoc = NULL; - return 1; -} - -static unsigned char -asn1_eoc_decode(struct asn1_ctx *ctx, unsigned char *eoc) +int +decode_negTokenInit(unsigned char *security_blob, int length, + struct TCP_Server_Info *server) { - unsigned char ch; - - if (eoc == NULL) { - if (!asn1_octet_decode(ctx, &ch)) - return 0; - - if (ch != 0x00) { - ctx->error = ASN1_ERR_DEC_EOC_MISMATCH; - return 0; - } - - if (!asn1_octet_decode(ctx, &ch)) - return 0; - - if (ch != 0x00) { - ctx->error = ASN1_ERR_DEC_EOC_MISMATCH; - return 0; - } - return 1; - } else { - if (ctx->pointer != eoc) { - ctx->error = ASN1_ERR_DEC_LENGTH_MISMATCH; - return 0; - } + if (asn1_ber_decoder(&spnego_negtokeninit_decoder, server, + security_blob, length) == 0) return 1; - } -} - -/* static unsigned char asn1_null_decode(struct asn1_ctx *ctx, - unsigned char *eoc) -{ - ctx->pointer = eoc; - return 1; -} - -static unsigned char asn1_long_decode(struct asn1_ctx *ctx, - unsigned char *eoc, long *integer) -{ - unsigned char ch; - unsigned int len; - - if (!asn1_octet_decode(ctx, &ch)) - return 0; - - *integer = (signed char) ch; - len = 1; - - while (ctx->pointer < eoc) { - if (++len > sizeof(long)) { - ctx->error = ASN1_ERR_DEC_BADVALUE; - return 0; - } - - if (!asn1_octet_decode(ctx, &ch)) - return 0; - - *integer <<= 8; - *integer |= ch; - } - return 1; -} - -static unsigned char asn1_uint_decode(struct asn1_ctx *ctx, - unsigned char *eoc, - unsigned int *integer) -{ - unsigned char ch; - unsigned int len; - - if (!asn1_octet_decode(ctx, &ch)) - return 0; - - *integer = ch; - if (ch == 0) - len = 0; else - len = 1; - - while (ctx->pointer < eoc) { - if (++len > sizeof(unsigned int)) { - ctx->error = ASN1_ERR_DEC_BADVALUE; - return 0; - } - - if (!asn1_octet_decode(ctx, &ch)) - return 0; - - *integer <<= 8; - *integer |= ch; - } - return 1; -} - -static unsigned char asn1_ulong_decode(struct asn1_ctx *ctx, - unsigned char *eoc, - unsigned long *integer) -{ - unsigned char ch; - unsigned int len; - - if (!asn1_octet_decode(ctx, &ch)) return 0; - - *integer = ch; - if (ch == 0) - len = 0; - else - len = 1; - - while (ctx->pointer < eoc) { - if (++len > sizeof(unsigned long)) { - ctx->error = ASN1_ERR_DEC_BADVALUE; - return 0; - } - - if (!asn1_octet_decode(ctx, &ch)) - return 0; - - *integer <<= 8; - *integer |= ch; - } - return 1; } -static unsigned char -asn1_octets_decode(struct asn1_ctx *ctx, - unsigned char *eoc, - unsigned char **octets, unsigned int *len) +int gssapi_this_mech(void *context, size_t hdrlen, + unsigned char tag, const void *value, size_t vlen) { - unsigned char *ptr; - - *len = 0; - - *octets = kmalloc(eoc - ctx->pointer, GFP_ATOMIC); - if (*octets == NULL) { - return 0; - } - - ptr = *octets; - while (ctx->pointer < eoc) { - if (!asn1_octet_decode(ctx, (unsigned char *) ptr++)) { - kfree(*octets); - *octets = NULL; - return 0; - } - (*len)++; - } - return 1; -} */ - -static unsigned char -asn1_subid_decode(struct asn1_ctx *ctx, unsigned long *subid) -{ - unsigned char ch; - - *subid = 0; - - do { - if (!asn1_octet_decode(ctx, &ch)) - return 0; - - *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; + enum OID oid; - while (ctx->pointer < eoc) { - if (++(*len) > size) { - ctx->error = ASN1_ERR_DEC_BADVALUE; - kfree(*oid); - *oid = NULL; - return 0; - } + oid = look_up_OID(value, vlen); + if (oid != OID_spnego) { + char buf[50]; - if (!asn1_subid_decode(ctx, optr++)) { - kfree(*oid); - *oid = NULL; - return 0; - } + sprint_oid(value, vlen, buf, sizeof(buf)); + cifs_dbg(FYI, "Error decoding negTokenInit header: unexpected OID %s\n", + buf); + return -EBADMSG; } - return 1; + return 0; } -static int -compare_oid(unsigned long *oid1, unsigned int oid1len, - unsigned long *oid2, unsigned int oid2len) +int neg_token_init_mech_type(void *context, size_t hdrlen, + unsigned char tag, + const void *value, size_t vlen) { - unsigned int i; + struct TCP_Server_Info *server = context; + enum OID oid; - if (oid1len != oid2len) - return 0; + oid = look_up_OID(value, vlen); + if (oid == OID_mskrb5) + server->sec_mskerberos = true; + else if (oid == OID_krb5u2u) + server->sec_kerberosu2u = true; + else if (oid == OID_krb5) + server->sec_kerberos = true; + else if (oid == OID_ntlmssp) + server->sec_ntlmssp = true; 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); + char buf[50]; - /* 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; + sprint_oid(value, vlen, buf, sizeof(buf)); + cifs_dbg(FYI, "Decoding negTokenInit: unsupported OID %s\n", + buf); } - - /* 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 exit 0\n", - cls, con, tag, 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 exit 1\n", - cls, con, tag, 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 exit 0\n", - cls, con, tag, 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 sequence_end = %p exit 1\n", - cls, con, tag, sequence_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; + return 0; } diff --git a/fs/cifs/spnego_negtokeninit.asn1 b/fs/cifs/spnego_negtokeninit.asn1 new file mode 100644 index 000000000000..aa5b4a61b3f5 --- /dev/null +++ b/fs/cifs/spnego_negtokeninit.asn1 @@ -0,0 +1,40 @@ +GSSAPI ::= + [APPLICATION 0] IMPLICIT SEQUENCE { + thisMech + OBJECT IDENTIFIER ({gssapi_this_mech}), + negotiationToken + NegotiationToken + } + +MechType ::= OBJECT IDENTIFIER ({neg_token_init_mech_type}) + +MechTypeList ::= SEQUENCE OF MechType + +NegHints ::= SEQUENCE { + hintName + [0] GeneralString OPTIONAL, + hintAddress + [1] OCTET STRING OPTIONAL + } + +NegTokenInit2 ::= + SEQUENCE { + mechTypes + [0] MechTypeList OPTIONAL, + reqFlags + [1] BIT STRING OPTIONAL, + mechToken + [2] OCTET STRING OPTIONAL, + negHints + [3] NegHints OPTIONAL, + mechListMIC + [3] OCTET STRING OPTIONAL + } + +NegotiationToken ::= + CHOICE { + negTokenInit + [0] NegTokenInit2, + negTokenTarg + [1] ANY + } diff --git a/include/linux/oid_registry.h b/include/linux/oid_registry.h index 461b7aa587ba..3d8db1f6a5db 100644 --- a/include/linux/oid_registry.h +++ b/include/linux/oid_registry.h @@ -54,6 +54,10 @@ enum OID { OID_md4, /* 1.2.840.113549.2.4 */ OID_md5, /* 1.2.840.113549.2.5 */ + OID_mskrb5, /* 1.2.840.48018.1.2.2 */ + OID_krb5, /* 1.2.840.113554.1.2.2 */ + OID_krb5u2u, /* 1.2.840.113554.1.2.2.3 */ + /* Microsoft Authenticode & Software Publishing */ OID_msIndirectData, /* 1.3.6.1.4.1.311.2.1.4 */ OID_msStatementType, /* 1.3.6.1.4.1.311.2.1.11 */ @@ -62,6 +66,10 @@ enum OID { OID_msIndividualSPKeyPurpose, /* 1.3.6.1.4.1.311.2.1.21 */ OID_msOutlookExpress, /* 1.3.6.1.4.1.311.16.4 */ + OID_ntlmssp, /* 1.3.6.1.4.1.311.2.2.10 */ + + OID_spnego, /* 1.3.6.1.5.5.2 */ + OID_certAuthInfoAccess, /* 1.3.6.1.5.5.7.1.1 */ OID_sha1, /* 1.3.14.3.2.26 */ OID_id_ansip384r1, /* 1.3.132.0.34 */
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> --- changes from v3: - Change Makefile to fix a compile error, "spnego_negtokeninit.asn1.h: No such file or directory". changes from v2: - Change Makefile to fix a compile error(kernel test bot). - Add cifsproto.h into asn1.c to fix a compile warning(kernel test bot). chnages from v1: - Select CONFIG_OID_REGISTRY fs/cifs/Kconfig | 2 + fs/cifs/Makefile | 8 +- fs/cifs/asn1.c | 623 ++----------------------------- fs/cifs/spnego_negtokeninit.asn1 | 40 ++ include/linux/oid_registry.h | 8 + 5 files changed, 93 insertions(+), 588 deletions(-) create mode 100644 fs/cifs/spnego_negtokeninit.asn1