Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 618 insertions, 0 deletions

diff --git a/fs/cifs/asn1.c b/fs/cifs/asn1.c
new file mode 100644
index 0000000..e02010d
--- /dev/null
+++ b/fs/cifs/asn1.c
@@ -0,0 +1,618 @@
+/* 
+ * 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).
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include "cifspdu.h"
+#include "cifsglob.h"
+#include "cifs_debug.h"
+#include "cifsproto.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_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
+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 };
+
+/* 
+ * 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;
+}
+
+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--;
+			}
+		}
+	}
+	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, len;
+
+	if (!asn1_id_decode(ctx, cls, con, tag))
+		return 0;
+
+	if (!asn1_length_decode(ctx, &def, &len))
+		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)
+{
+	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;
+		}
+		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)
+{
+	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;
+	*oid = kmalloc(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,
+		    enum securityEnum *secType)
+{
+	struct asn1_ctx ctx;
+	unsigned char *end;
+	unsigned char *sequence_end;
+	unsigned long *oid = NULL;
+	unsigned int cls, con, tag, oidlen, rc;
+	int use_ntlmssp = FALSE;
+
+	*secType = NTLM; /* BB eventually make Kerberos or NLTMSSP the default */
+
+	/* cifs_dump_mem(" Received SecBlob ", security_blob, length); */
+
+	asn1_open(&ctx, security_blob, length);
+
+	if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
+		cFYI(1, ("Error decoding negTokenInit header "));
+		return 0;
+	} else if ((cls != ASN1_APL) || (con != ASN1_CON)
+		   || (tag != ASN1_EOC)) {
+		cFYI(1, ("cls = %d con = %d tag = %d", cls, con, tag));
+		return 0;
+	} else {
+		/*      remember to free obj->oid */
+		rc = asn1_header_decode(&ctx, &end, &cls, &con, &tag);
+		if (rc) {
+			if ((tag == ASN1_OJI) && (cls == ASN1_PRI)) {
+				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;
+		}
+
+		if (!rc) {
+			cFYI(1, ("Error decoding negTokenInit header"));
+			return 0;
+		}
+
+		if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
+			cFYI(1, ("Error decoding negTokenInit "));
+			return 0;
+		} else if ((cls != ASN1_CTX) || (con != ASN1_CON)
+			   || (tag != ASN1_EOC)) {
+			cFYI(1,("cls = %d con = %d tag = %d end = %p (%d) exit 0",
+			      cls, con, tag, end, *end));
+			return 0;
+		}
+
+		if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
+			cFYI(1, ("Error decoding negTokenInit "));
+			return 0;
+		} else if ((cls != ASN1_UNI) || (con != ASN1_CON)
+			   || (tag != ASN1_SEQ)) {
+			cFYI(1,("cls = %d con = %d tag = %d end = %p (%d) exit 1",
+			      cls, con, tag, end, *end));
+			return 0;
+		}
+
+		if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
+			cFYI(1, ("Error decoding 2nd part of negTokenInit "));
+			return 0;
+		} else if ((cls != ASN1_CTX) || (con != ASN1_CON)
+			   || (tag != ASN1_EOC)) {
+			cFYI(1,
+			     ("cls = %d con = %d tag = %d end = %p (%d) exit 0",
+			      cls, con, tag, end, *end));
+			return 0;
+		}
+
+		if (asn1_header_decode
+		    (&ctx, &sequence_end, &cls, &con, &tag) == 0) {
+			cFYI(1, ("Error decoding 2nd part of negTokenInit "));
+			return 0;
+		} else if ((cls != ASN1_UNI) || (con != ASN1_CON)
+			   || (tag != ASN1_SEQ)) {
+			cFYI(1,
+			     ("cls = %d con = %d tag = %d end = %p (%d) exit 1",
+			      cls, con, tag, end, *end));
+			return 0;
+		}
+
+		while (!asn1_eoc_decode(&ctx, sequence_end)) {
+			rc = asn1_header_decode(&ctx, &end, &cls, &con, &tag);
+			if (!rc) {
+				cFYI(1,
+				     ("Error 1 decoding negTokenInit header exit 2"));
+				return 0;
+			}
+			if ((tag == ASN1_OJI) && (con == ASN1_PRI)) {
+				rc = asn1_oid_decode(&ctx, end, &oid, &oidlen);
+				if(rc) {		
+					cFYI(1,
+					  ("OID len = %d oid = 0x%lx 0x%lx 0x%lx 0x%lx",
+					   oidlen, *oid, *(oid + 1), *(oid + 2),
+					   *(oid + 3)));
+					rc = compare_oid(oid, oidlen, NTLMSSP_OID,
+						 NTLMSSP_OID_LEN);
+					if(oid)
+						kfree(oid);
+					if (rc)
+						use_ntlmssp = TRUE;
+				}
+			} else {
+				cFYI(1,("This should be an oid what is going on? "));
+			}
+		}
+
+		if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
+			cFYI(1,
+			     ("Error decoding last part of negTokenInit exit 3"));
+			return 0;
+		} else if ((cls != ASN1_CTX) || (con != ASN1_CON)) {	/* tag = 3 indicating mechListMIC */
+			cFYI(1,
+			     ("Exit 4 cls = %d con = %d tag = %d end = %p (%d)",
+			      cls, con, tag, end, *end));
+			return 0;
+		}
+		if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
+			cFYI(1,
+			     ("Error decoding last part of negTokenInit exit 5"));
+			return 0;
+		} else if ((cls != ASN1_UNI) || (con != ASN1_CON)
+			   || (tag != ASN1_SEQ)) {
+			cFYI(1,
+			     ("Exit 6 cls = %d con = %d tag = %d end = %p (%d)",
+			      cls, con, tag, end, *end));
+		}
+
+		if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
+			cFYI(1,
+			     ("Error decoding last part of negTokenInit exit 7"));
+			return 0;
+		} else if ((cls != ASN1_CTX) || (con != ASN1_CON)) {
+			cFYI(1,
+			     ("Exit 8 cls = %d con = %d tag = %d end = %p (%d)",
+			      cls, con, tag, end, *end));
+			return 0;
+		}
+		if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
+			cFYI(1,
+			     ("Error decoding last part of negTokenInit exit 9"));
+			return 0;
+		} else if ((cls != ASN1_UNI) || (con != ASN1_PRI)
+			   || (tag != ASN1_GENSTR)) {
+			cFYI(1,
+			     ("Exit 10 cls = %d con = %d tag = %d end = %p (%d)",
+			      cls, con, tag, end, *end));
+			return 0;
+		}
+		cFYI(1, ("Need to call asn1_octets_decode() function for this %s", ctx.pointer));	/* is this UTF-8 or ASCII? */
+	}
+
+	/* if (use_kerberos) 
+	   *secType = Kerberos 
+	   else */
+	if (use_ntlmssp) {
+		*secType = NTLMSSP;
+	}
+
+	return 1;
+}