-/*
+/*
* 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
* 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>
#define SPNEGO_OID_LEN 7
#define NTLMSSP_OID_LEN 10
+#define KRB5_OID_LEN 7
+#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 MSKRB5_OID[7] = { 1, 2, 840, 48018, 1, 2, 2 };
-/*
+/*
* ASN.1 context.
*/
struct asn1_ctx {
}
}
}
+
+ /* don't trust len bigger than ctx buffer */
+ if (*len > ctx->end - ctx->pointer)
+ return 0;
+
return 1;
}
unsigned char **eoc,
unsigned int *cls, unsigned int *con, unsigned int *tag)
{
- unsigned int def = 0;
+ unsigned int def = 0;
unsigned int len = 0;
if (!asn1_id_decode(ctx, cls, con, tag))
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
*integer |= ch;
}
return 1;
-}
+}
static unsigned char
asn1_octets_decode(struct asn1_ctx *ctx,
return 1;
}
-static int
+static int
asn1_oid_decode(struct asn1_ctx *ctx,
unsigned char *eoc, unsigned long **oid, unsigned int *len)
{
unsigned long *optr;
size = eoc - ctx->pointer + 1;
- *oid = kmalloc(size * sizeof (unsigned long), GFP_ATOMIC);
- if (*oid == NULL) {
+
+ /* first subid actually encodes first two subids */
+ if (size < 2 || size > UINT_MAX/sizeof(unsigned long))
+ return 0;
+
+ *oid = kmalloc(size * sizeof(unsigned long), GFP_ATOMIC);
+ if (*oid == NULL)
return 0;
- }
optr = *oid;
unsigned char *sequence_end;
unsigned long *oid = NULL;
unsigned int cls, con, tag, oidlen, rc;
- int use_ntlmssp = FALSE;
+ bool use_ntlmssp = false;
+ bool use_kerberos = false;
+ bool use_mskerberos = false;
- *secType = NTLM; /* BB eventually make Kerberos or NLTMSSP the default */
+ *secType = NTLM; /* BB eventually make Kerberos or NLTMSSP the default*/
/* 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) {
- cFYI(1, ("Error decoding negTokenInit header "));
+ 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;
- }
+ /* 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;
+ }
- 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;
- }
+ /* SPNEGO OID not present or garbled -- bail out */
+ 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_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 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 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, &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, &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;
- }
+ 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;
+ }
- 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);
- kfree(oid);
- if (rc)
- use_ntlmssp = TRUE;
- }
- } else {
- cFYI(1,("This should be an oid what is going on? "));
- }
- }
+ 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;
+ }
- 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 */
+ while (!asn1_eoc_decode(&ctx, sequence_end)) {
+ rc = asn1_header_decode(&ctx, &end, &cls, &con, &tag);
+ if (!rc) {
cFYI(1,
- ("Exit 4 cls = %d con = %d tag = %d end = %p (%d)",
- cls, con, tag, end, *end));
+ ("Error decoding negTokenInit hdr exit2"));
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 ((tag == ASN1_OJI) && (con == ASN1_PRI)) {
+ if (asn1_oid_decode(&ctx, end, &oid, &oidlen)) {
+
+ cFYI(1, ("OID len = %d oid = 0x%lx 0x%lx "
+ "0x%lx 0x%lx", oidlen, *oid,
+ *(oid + 1), *(oid + 2), *(oid + 3)));
+
+ if (compare_oid(oid, oidlen, MSKRB5_OID,
+ MSKRB5_OID_LEN) &&
+ !use_kerberos)
+ use_mskerberos = true;
+ else if (compare_oid(oid, oidlen, KRB5_OID,
+ KRB5_OID_LEN) &&
+ !use_mskerberos)
+ use_kerberos = true;
+ else if (compare_oid(oid, oidlen, NTLMSSP_OID,
+ NTLMSSP_OID_LEN))
+ use_ntlmssp = true;
+
+ kfree(oid);
+ }
+ } else {
+ cFYI(1, ("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 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 (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
+ cFYI(1, ("Error decoding last part negTokenInit exit3"));
+ 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 negTokenInit exit5"));
+ return 0;
+ } else if ((cls != ASN1_UNI) || (con != ASN1_CON)
+ || (tag != ASN1_SEQ)) {
+ cFYI(1, ("cls = %d con = %d tag = %d end = %p (%d)",
+ cls, con, tag, end, *end));
}
- /* if (use_kerberos)
- *secType = Kerberos
- else */
- if (use_ntlmssp) {
- *secType = NTLMSSP;
+ if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
+ cFYI(1, ("Error decoding last part 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 negTokenInit exit9"));
+ return 0;
+ } else if ((cls != ASN1_UNI) || (con != ASN1_PRI)
+ || (tag != ASN1_GENSTR)) {
+ cFYI(1, ("Exit10 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 %s",
+ ctx.pointer)); /* is this UTF-8 or ASCII? */
+
+ if (use_kerberos)
+ *secType = Kerberos;
+ else if (use_mskerberos)
+ *secType = MSKerberos;
+ else if (use_ntlmssp)
+ *secType = NTLMSSP;
return 1;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff