#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 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.
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 lenght 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)
{
}
}
}
+
+ /* don't trust len bigger than ctx buffer */
+ if (*len > ctx->end - ctx->pointer)
+ return 0;
+
return 1;
}
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
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(size * sizeof(unsigned long), GFP_ATOMIC);
if (*oid == NULL)
return 0;
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*/
+ bool use_ntlmssp = false;
+ bool use_kerberos = false;
+ bool use_kerberosu2u = false;
+ bool use_mskerberos = false;
/* 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"));
return 0;
|| (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;
- }
+ /* SPNEGO */
+ 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;
- }
+ /* negTokenInit */
+ 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;
- }
+ /* sequence */
+ 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 decoding negTokenInit hdr exit2"));
- 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, ("Should be an oid what is going on?"));
- }
- }
+ /* sequence of */
+ 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 negTokenInit exit3"));
- return 0;
- } else if ((cls != ASN1_CTX) || (con != ASN1_CON)) {
- /* tag = 3 indicating mechListMIC */
+ /* list of security mechanisms */
+ 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 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 ((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_mskerberos)
+ use_mskerberos = true;
+ else if (compare_oid(oid, oidlen, KRB5U2U_OID,
+ KRB5U2U_OID_LEN) &&
+ !use_kerberosu2u)
+ use_kerberosu2u = true;
+ else if (compare_oid(oid, oidlen, KRB5_OID,
+ KRB5_OID_LEN) &&
+ !use_kerberos)
+ 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 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? */
+ /* mechlistMIC */
+ if (asn1_header_decode(&ctx, &end, &cls, &con, &tag) == 0) {
+ /* Check if we have reached the end of the blob, but with
+ no mechListMic (e.g. NTLMSSP instead of KRB5) */
+ if (ctx.error == ASN1_ERR_DEC_EMPTY)
+ goto decode_negtoken_exit;
+ 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 (use_kerberos)
- *secType = Kerberos
- else */
- if (use_ntlmssp) {
- *secType = NTLMSSP;
+ /* sequence */
+ 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));
+ }
+
+ /* sequence of */
+ 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;
+ }
+
+ /* general string */
+ 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? */
+decode_negtoken_exit:
+ if (use_kerberos)
+ *secType = Kerberos;
+ else if (use_mskerberos)
+ *secType = MSKerberos;
+ else if (use_ntlmssp)
+ *secType = RawNTLMSSP;
return 1;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff