--- /dev/null
+/*
+ * X.509v3 certificate parsing and processing (RFC 3280 profile)
+ * Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "crypto/crypto.h"
+#include "asn1.h"
+#include "x509v3.h"
+
+
+static void x509_free_name(struct x509_name *name)
+{
+ size_t i;
+
+ for (i = 0; i < name->num_attr; i++) {
+ os_free(name->attr[i].value);
+ name->attr[i].value = NULL;
+ name->attr[i].type = X509_NAME_ATTR_NOT_USED;
+ }
+ name->num_attr = 0;
+ os_free(name->email);
+ name->email = NULL;
+
+ os_free(name->alt_email);
+ os_free(name->dns);
+ os_free(name->uri);
+ os_free(name->ip);
+ name->alt_email = name->dns = name->uri = NULL;
+ name->ip = NULL;
+ name->ip_len = 0;
+ os_memset(&name->rid, 0, sizeof(name->rid));
+}
+
+
+/**
+ * x509_certificate_free - Free an X.509 certificate
+ * @cert: Certificate to be freed
+ */
+void x509_certificate_free(struct x509_certificate *cert)
+{
+ if (cert == NULL)
+ return;
+ if (cert->next) {
+ wpa_printf(MSG_DEBUG, "X509: x509_certificate_free: cer=%p "
+ "was still on a list (next=%p)\n",
+ cert, cert->next);
+ }
+ x509_free_name(&cert->issuer);
+ x509_free_name(&cert->subject);
+ os_free(cert->public_key);
+ os_free(cert->sign_value);
+ os_free(cert);
+}
+
+
+/**
+ * x509_certificate_free - Free an X.509 certificate chain
+ * @cert: Pointer to the first certificate in the chain
+ */
+void x509_certificate_chain_free(struct x509_certificate *cert)
+{
+ struct x509_certificate *next;
+
+ while (cert) {
+ next = cert->next;
+ cert->next = NULL;
+ x509_certificate_free(cert);
+ cert = next;
+ }
+}
+
+
+static int x509_whitespace(char c)
+{
+ return c == ' ' || c == '\t';
+}
+
+
+static void x509_str_strip_whitespace(char *a)
+{
+ char *ipos, *opos;
+ int remove_whitespace = 1;
+
+ ipos = opos = a;
+
+ while (*ipos) {
+ if (remove_whitespace && x509_whitespace(*ipos))
+ ipos++;
+ else {
+ remove_whitespace = x509_whitespace(*ipos);
+ *opos++ = *ipos++;
+ }
+ }
+
+ *opos-- = '\0';
+ if (opos > a && x509_whitespace(*opos))
+ *opos = '\0';
+}
+
+
+static int x509_str_compare(const char *a, const char *b)
+{
+ char *aa, *bb;
+ int ret;
+
+ if (!a && b)
+ return -1;
+ if (a && !b)
+ return 1;
+ if (!a && !b)
+ return 0;
+
+ aa = os_strdup(a);
+ bb = os_strdup(b);
+
+ if (aa == NULL || bb == NULL) {
+ os_free(aa);
+ os_free(bb);
+ return os_strcasecmp(a, b);
+ }
+
+ x509_str_strip_whitespace(aa);
+ x509_str_strip_whitespace(bb);
+
+ ret = os_strcasecmp(aa, bb);
+
+ os_free(aa);
+ os_free(bb);
+
+ return ret;
+}
+
+
+/**
+ * x509_name_compare - Compare X.509 certificate names
+ * @a: Certificate name
+ * @b: Certificate name
+ * Returns: <0, 0, or >0 based on whether a is less than, equal to, or
+ * greater than b
+ */
+int x509_name_compare(struct x509_name *a, struct x509_name *b)
+{
+ int res;
+ size_t i;
+
+ if (!a && b)
+ return -1;
+ if (a && !b)
+ return 1;
+ if (!a && !b)
+ return 0;
+ if (a->num_attr < b->num_attr)
+ return -1;
+ if (a->num_attr > b->num_attr)
+ return 1;
+
+ for (i = 0; i < a->num_attr; i++) {
+ if (a->attr[i].type < b->attr[i].type)
+ return -1;
+ if (a->attr[i].type > b->attr[i].type)
+ return -1;
+ res = x509_str_compare(a->attr[i].value, b->attr[i].value);
+ if (res)
+ return res;
+ }
+ res = x509_str_compare(a->email, b->email);
+ if (res)
+ return res;
+
+ return 0;
+}
+
+
+static int x509_parse_algorithm_identifier(
+ const u8 *buf, size_t len,
+ struct x509_algorithm_identifier *id, const u8 **next)
+{
+ struct asn1_hdr hdr;
+ const u8 *pos, *end;
+
+ /*
+ * AlgorithmIdentifier ::= SEQUENCE {
+ * algorithm OBJECT IDENTIFIER,
+ * parameters ANY DEFINED BY algorithm OPTIONAL
+ * }
+ */
+
+ if (asn1_get_next(buf, len, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE "
+ "(AlgorithmIdentifier) - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+ pos = hdr.payload;
+ end = pos + hdr.length;
+
+ if (end > buf + len)
+ return -1;
+
+ *next = end;
+
+ if (asn1_get_oid(pos, end - pos, &id->oid, &pos))
+ return -1;
+
+ /* TODO: optional parameters */
+
+ return 0;
+}
+
+
+static int x509_parse_public_key(const u8 *buf, size_t len,
+ struct x509_certificate *cert,
+ const u8 **next)
+{
+ struct asn1_hdr hdr;
+ const u8 *pos, *end;
+
+ /*
+ * SubjectPublicKeyInfo ::= SEQUENCE {
+ * algorithm AlgorithmIdentifier,
+ * subjectPublicKey BIT STRING
+ * }
+ */
+
+ pos = buf;
+ end = buf + len;
+
+ if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE "
+ "(SubjectPublicKeyInfo) - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+ pos = hdr.payload;
+
+ if (pos + hdr.length > end)
+ return -1;
+ end = pos + hdr.length;
+ *next = end;
+
+ if (x509_parse_algorithm_identifier(pos, end - pos,
+ &cert->public_key_alg, &pos))
+ return -1;
+
+ if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_BITSTRING) {
+ wpa_printf(MSG_DEBUG, "X509: Expected BITSTRING "
+ "(subjectPublicKey) - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+ if (hdr.length < 1)
+ return -1;
+ pos = hdr.payload;
+ if (*pos) {
+ wpa_printf(MSG_DEBUG, "X509: BITSTRING - %d unused bits",
+ *pos);
+ /*
+ * TODO: should this be rejected? X.509 certificates are
+ * unlikely to use such a construction. Now we would end up
+ * including the extra bits in the buffer which may also be
+ * ok.
+ */
+ }
+ os_free(cert->public_key);
+ cert->public_key = os_malloc(hdr.length - 1);
+ if (cert->public_key == NULL) {
+ wpa_printf(MSG_DEBUG, "X509: Failed to allocate memory for "
+ "public key");
+ return -1;
+ }
+ os_memcpy(cert->public_key, pos + 1, hdr.length - 1);
+ cert->public_key_len = hdr.length - 1;
+ wpa_hexdump(MSG_MSGDUMP, "X509: subjectPublicKey",
+ cert->public_key, cert->public_key_len);
+
+ return 0;
+}
+
+
+static int x509_parse_name(const u8 *buf, size_t len, struct x509_name *name,
+ const u8 **next)
+{
+ struct asn1_hdr hdr;
+ const u8 *pos, *end, *set_pos, *set_end, *seq_pos, *seq_end;
+ struct asn1_oid oid;
+ char *val;
+
+ /*
+ * Name ::= CHOICE { RDNSequence }
+ * RDNSequence ::= SEQUENCE OF RelativeDistinguishedName
+ * RelativeDistinguishedName ::= SET OF AttributeTypeAndValue
+ * AttributeTypeAndValue ::= SEQUENCE {
+ * type AttributeType,
+ * value AttributeValue
+ * }
+ * AttributeType ::= OBJECT IDENTIFIER
+ * AttributeValue ::= ANY DEFINED BY AttributeType
+ */
+
+ if (asn1_get_next(buf, len, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE "
+ "(Name / RDNSequencer) - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+ pos = hdr.payload;
+
+ if (pos + hdr.length > buf + len)
+ return -1;
+
+ end = *next = pos + hdr.length;
+
+ while (pos < end) {
+ enum x509_name_attr_type type;
+
+ if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SET) {
+ wpa_printf(MSG_DEBUG, "X509: Expected SET "
+ "(RelativeDistinguishedName) - found class "
+ "%d tag 0x%x", hdr.class, hdr.tag);
+ x509_free_name(name);
+ return -1;
+ }
+
+ set_pos = hdr.payload;
+ pos = set_end = hdr.payload + hdr.length;
+
+ if (asn1_get_next(set_pos, set_end - set_pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE "
+ "(AttributeTypeAndValue) - found class %d "
+ "tag 0x%x", hdr.class, hdr.tag);
+ x509_free_name(name);
+ return -1;
+ }
+
+ seq_pos = hdr.payload;
+ seq_end = hdr.payload + hdr.length;
+
+ if (asn1_get_oid(seq_pos, seq_end - seq_pos, &oid, &seq_pos)) {
+ x509_free_name(name);
+ return -1;
+ }
+
+ if (asn1_get_next(seq_pos, seq_end - seq_pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL) {
+ wpa_printf(MSG_DEBUG, "X509: Failed to parse "
+ "AttributeValue");
+ x509_free_name(name);
+ return -1;
+ }
+
+ /* RFC 3280:
+ * MUST: country, organization, organizational-unit,
+ * distinguished name qualifier, state or province name,
+ * common name, serial number.
+ * SHOULD: locality, title, surname, given name, initials,
+ * pseudonym, generation qualifier.
+ * MUST: domainComponent (RFC 2247).
+ */
+ type = X509_NAME_ATTR_NOT_USED;
+ if (oid.len == 4 &&
+ oid.oid[0] == 2 && oid.oid[1] == 5 && oid.oid[2] == 4) {
+ /* id-at ::= 2.5.4 */
+ switch (oid.oid[3]) {
+ case 3:
+ /* commonName */
+ type = X509_NAME_ATTR_CN;
+ break;
+ case 6:
+ /* countryName */
+ type = X509_NAME_ATTR_C;
+ break;
+ case 7:
+ /* localityName */
+ type = X509_NAME_ATTR_L;
+ break;
+ case 8:
+ /* stateOrProvinceName */
+ type = X509_NAME_ATTR_ST;
+ break;
+ case 10:
+ /* organizationName */
+ type = X509_NAME_ATTR_O;
+ break;
+ case 11:
+ /* organizationalUnitName */
+ type = X509_NAME_ATTR_OU;
+ break;
+ }
+ } else if (oid.len == 7 &&
+ oid.oid[0] == 1 && oid.oid[1] == 2 &&
+ oid.oid[2] == 840 && oid.oid[3] == 113549 &&
+ oid.oid[4] == 1 && oid.oid[5] == 9 &&
+ oid.oid[6] == 1) {
+ /* 1.2.840.113549.1.9.1 - e-mailAddress */
+ os_free(name->email);
+ name->email = os_malloc(hdr.length + 1);
+ if (name->email == NULL) {
+ x509_free_name(name);
+ return -1;
+ }
+ os_memcpy(name->email, hdr.payload, hdr.length);
+ name->email[hdr.length] = '\0';
+ continue;
+ } else if (oid.len == 7 &&
+ oid.oid[0] == 0 && oid.oid[1] == 9 &&
+ oid.oid[2] == 2342 && oid.oid[3] == 19200300 &&
+ oid.oid[4] == 100 && oid.oid[5] == 1 &&
+ oid.oid[6] == 25) {
+ /* 0.9.2342.19200300.100.1.25 - domainComponent */
+ type = X509_NAME_ATTR_DC;
+ }
+
+ if (type == X509_NAME_ATTR_NOT_USED) {
+ wpa_hexdump(MSG_DEBUG, "X509: Unrecognized OID",
+ (u8 *) oid.oid,
+ oid.len * sizeof(oid.oid[0]));
+ wpa_hexdump_ascii(MSG_MSGDUMP, "X509: Attribute Data",
+ hdr.payload, hdr.length);
+ continue;
+ }
+
+ if (name->num_attr == X509_MAX_NAME_ATTRIBUTES) {
+ wpa_printf(MSG_INFO, "X509: Too many Name attributes");
+ x509_free_name(name);
+ return -1;
+ }
+
+ val = os_malloc(hdr.length + 1);
+ if (val == NULL) {
+ x509_free_name(name);
+ return -1;
+ }
+ os_memcpy(val, hdr.payload, hdr.length);
+ val[hdr.length] = '\0';
+ if (os_strlen(val) != hdr.length) {
+ wpa_printf(MSG_INFO, "X509: Reject certificate with "
+ "embedded NUL byte in a string (%s[NUL])",
+ val);
+ x509_free_name(name);
+ return -1;
+ }
+
+ name->attr[name->num_attr].type = type;
+ name->attr[name->num_attr].value = val;
+ name->num_attr++;
+ }
+
+ return 0;
+}
+
+
+static char * x509_name_attr_str(enum x509_name_attr_type type)
+{
+ switch (type) {
+ case X509_NAME_ATTR_NOT_USED:
+ return "[N/A]";
+ case X509_NAME_ATTR_DC:
+ return "DC";
+ case X509_NAME_ATTR_CN:
+ return "CN";
+ case X509_NAME_ATTR_C:
+ return "C";
+ case X509_NAME_ATTR_L:
+ return "L";
+ case X509_NAME_ATTR_ST:
+ return "ST";
+ case X509_NAME_ATTR_O:
+ return "O";
+ case X509_NAME_ATTR_OU:
+ return "OU";
+ }
+ return "?";
+}
+
+
+/**
+ * x509_name_string - Convert an X.509 certificate name into a string
+ * @name: Name to convert
+ * @buf: Buffer for the string
+ * @len: Maximum buffer length
+ */
+void x509_name_string(struct x509_name *name, char *buf, size_t len)
+{
+ char *pos, *end;
+ int ret;
+ size_t i;
+
+ if (len == 0)
+ return;
+
+ pos = buf;
+ end = buf + len;
+
+ for (i = 0; i < name->num_attr; i++) {
+ ret = os_snprintf(pos, end - pos, "%s=%s, ",
+ x509_name_attr_str(name->attr[i].type),
+ name->attr[i].value);
+ if (ret < 0 || ret >= end - pos)
+ goto done;
+ pos += ret;
+ }
+
+ if (pos > buf + 1 && pos[-1] == ' ' && pos[-2] == ',') {
+ pos--;
+ *pos = '\0';
+ pos--;
+ *pos = '\0';
+ }
+
+ if (name->email) {
+ ret = os_snprintf(pos, end - pos, "/emailAddress=%s",
+ name->email);
+ if (ret < 0 || ret >= end - pos)
+ goto done;
+ pos += ret;
+ }
+
+done:
+ end[-1] = '\0';
+}
+
+
+static int x509_parse_time(const u8 *buf, size_t len, u8 asn1_tag,
+ os_time_t *val)
+{
+ const char *pos;
+ int year, month, day, hour, min, sec;
+
+ /*
+ * Time ::= CHOICE {
+ * utcTime UTCTime,
+ * generalTime GeneralizedTime
+ * }
+ *
+ * UTCTime: YYMMDDHHMMSSZ
+ * GeneralizedTime: YYYYMMDDHHMMSSZ
+ */
+
+ pos = (const char *) buf;
+
+ switch (asn1_tag) {
+ case ASN1_TAG_UTCTIME:
+ if (len != 13 || buf[12] != 'Z') {
+ wpa_hexdump_ascii(MSG_DEBUG, "X509: Unrecognized "
+ "UTCTime format", buf, len);
+ return -1;
+ }
+ if (sscanf(pos, "%02d", &year) != 1) {
+ wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse "
+ "UTCTime year", buf, len);
+ return -1;
+ }
+ if (year < 50)
+ year += 2000;
+ else
+ year += 1900;
+ pos += 2;
+ break;
+ case ASN1_TAG_GENERALIZEDTIME:
+ if (len != 15 || buf[14] != 'Z') {
+ wpa_hexdump_ascii(MSG_DEBUG, "X509: Unrecognized "
+ "GeneralizedTime format", buf, len);
+ return -1;
+ }
+ if (sscanf(pos, "%04d", &year) != 1) {
+ wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse "
+ "GeneralizedTime year", buf, len);
+ return -1;
+ }
+ pos += 4;
+ break;
+ default:
+ wpa_printf(MSG_DEBUG, "X509: Expected UTCTime or "
+ "GeneralizedTime - found tag 0x%x", asn1_tag);
+ return -1;
+ }
+
+ if (sscanf(pos, "%02d", &month) != 1) {
+ wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse Time "
+ "(month)", buf, len);
+ return -1;
+ }
+ pos += 2;
+
+ if (sscanf(pos, "%02d", &day) != 1) {
+ wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse Time "
+ "(day)", buf, len);
+ return -1;
+ }
+ pos += 2;
+
+ if (sscanf(pos, "%02d", &hour) != 1) {
+ wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse Time "
+ "(hour)", buf, len);
+ return -1;
+ }
+ pos += 2;
+
+ if (sscanf(pos, "%02d", &min) != 1) {
+ wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse Time "
+ "(min)", buf, len);
+ return -1;
+ }
+ pos += 2;
+
+ if (sscanf(pos, "%02d", &sec) != 1) {
+ wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse Time "
+ "(sec)", buf, len);
+ return -1;
+ }
+
+ if (os_mktime(year, month, day, hour, min, sec, val) < 0) {
+ wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to convert Time",
+ buf, len);
+ if (year < 1970) {
+ /*
+ * At least some test certificates have been configured
+ * to use dates prior to 1970. Set the date to
+ * beginning of 1970 to handle these case.
+ */
+ wpa_printf(MSG_DEBUG, "X509: Year=%d before epoch - "
+ "assume epoch as the time", year);
+ *val = 0;
+ return 0;
+ }
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static int x509_parse_validity(const u8 *buf, size_t len,
+ struct x509_certificate *cert, const u8 **next)
+{
+ struct asn1_hdr hdr;
+ const u8 *pos;
+ size_t plen;
+
+ /*
+ * Validity ::= SEQUENCE {
+ * notBefore Time,
+ * notAfter Time
+ * }
+ *
+ * RFC 3280, 4.1.2.5:
+ * CAs conforming to this profile MUST always encode certificate
+ * validity dates through the year 2049 as UTCTime; certificate
+ * validity dates in 2050 or later MUST be encoded as GeneralizedTime.
+ */
+
+ if (asn1_get_next(buf, len, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE "
+ "(Validity) - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+ pos = hdr.payload;
+ plen = hdr.length;
+
+ if (pos + plen > buf + len)
+ return -1;
+
+ *next = pos + plen;
+
+ if (asn1_get_next(pos, plen, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ x509_parse_time(hdr.payload, hdr.length, hdr.tag,
+ &cert->not_before) < 0) {
+ wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse notBefore "
+ "Time", hdr.payload, hdr.length);
+ return -1;
+ }
+
+ pos = hdr.payload + hdr.length;
+ plen = *next - pos;
+
+ if (asn1_get_next(pos, plen, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ x509_parse_time(hdr.payload, hdr.length, hdr.tag,
+ &cert->not_after) < 0) {
+ wpa_hexdump_ascii(MSG_DEBUG, "X509: Failed to parse notAfter "
+ "Time", hdr.payload, hdr.length);
+ return -1;
+ }
+
+ wpa_printf(MSG_MSGDUMP, "X509: Validity: notBefore: %lu notAfter: %lu",
+ (unsigned long) cert->not_before,
+ (unsigned long) cert->not_after);
+
+ return 0;
+}
+
+
+static int x509_id_ce_oid(struct asn1_oid *oid)
+{
+ /* id-ce arc from X.509 for standard X.509v3 extensions */
+ return oid->len >= 4 &&
+ oid->oid[0] == 2 /* joint-iso-ccitt */ &&
+ oid->oid[1] == 5 /* ds */ &&
+ oid->oid[2] == 29 /* id-ce */;
+}
+
+
+static int x509_parse_ext_key_usage(struct x509_certificate *cert,
+ const u8 *pos, size_t len)
+{
+ struct asn1_hdr hdr;
+
+ /*
+ * KeyUsage ::= BIT STRING {
+ * digitalSignature (0),
+ * nonRepudiation (1),
+ * keyEncipherment (2),
+ * dataEncipherment (3),
+ * keyAgreement (4),
+ * keyCertSign (5),
+ * cRLSign (6),
+ * encipherOnly (7),
+ * decipherOnly (8) }
+ */
+
+ if (asn1_get_next(pos, len, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_BITSTRING ||
+ hdr.length < 1) {
+ wpa_printf(MSG_DEBUG, "X509: Expected BIT STRING in "
+ "KeyUsage; found %d tag 0x%x len %d",
+ hdr.class, hdr.tag, hdr.length);
+ return -1;
+ }
+
+ cert->extensions_present |= X509_EXT_KEY_USAGE;
+ cert->key_usage = asn1_bit_string_to_long(hdr.payload, hdr.length);
+
+ wpa_printf(MSG_DEBUG, "X509: KeyUsage 0x%lx", cert->key_usage);
+
+ return 0;
+}
+
+
+static int x509_parse_ext_basic_constraints(struct x509_certificate *cert,
+ const u8 *pos, size_t len)
+{
+ struct asn1_hdr hdr;
+ unsigned long value;
+ size_t left;
+
+ /*
+ * BasicConstraints ::= SEQUENCE {
+ * cA BOOLEAN DEFAULT FALSE,
+ * pathLenConstraint INTEGER (0..MAX) OPTIONAL }
+ */
+
+ if (asn1_get_next(pos, len, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE in "
+ "BasicConstraints; found %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+
+ cert->extensions_present |= X509_EXT_BASIC_CONSTRAINTS;
+
+ if (hdr.length == 0)
+ return 0;
+
+ if (asn1_get_next(hdr.payload, hdr.length, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL) {
+ wpa_printf(MSG_DEBUG, "X509: Failed to parse "
+ "BasicConstraints");
+ return -1;
+ }
+
+ if (hdr.tag == ASN1_TAG_BOOLEAN) {
+ if (hdr.length != 1) {
+ wpa_printf(MSG_DEBUG, "X509: Unexpected "
+ "Boolean length (%u) in BasicConstraints",
+ hdr.length);
+ return -1;
+ }
+ cert->ca = hdr.payload[0];
+
+ if (hdr.payload + hdr.length == pos + len) {
+ wpa_printf(MSG_DEBUG, "X509: BasicConstraints - cA=%d",
+ cert->ca);
+ return 0;
+ }
+
+ if (asn1_get_next(hdr.payload + hdr.length, len - hdr.length,
+ &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL) {
+ wpa_printf(MSG_DEBUG, "X509: Failed to parse "
+ "BasicConstraints");
+ return -1;
+ }
+ }
+
+ if (hdr.tag != ASN1_TAG_INTEGER) {
+ wpa_printf(MSG_DEBUG, "X509: Expected INTEGER in "
+ "BasicConstraints; found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+
+ pos = hdr.payload;
+ left = hdr.length;
+ value = 0;
+ while (left) {
+ value <<= 8;
+ value |= *pos++;
+ left--;
+ }
+
+ cert->path_len_constraint = value;
+ cert->extensions_present |= X509_EXT_PATH_LEN_CONSTRAINT;
+
+ wpa_printf(MSG_DEBUG, "X509: BasicConstraints - cA=%d "
+ "pathLenConstraint=%lu",
+ cert->ca, cert->path_len_constraint);
+
+ return 0;
+}
+
+
+static int x509_parse_alt_name_rfc8222(struct x509_name *name,
+ const u8 *pos, size_t len)
+{
+ /* rfc822Name IA5String */
+ wpa_hexdump_ascii(MSG_MSGDUMP, "X509: altName - rfc822Name", pos, len);
+ os_free(name->alt_email);
+ name->alt_email = os_zalloc(len + 1);
+ if (name->alt_email == NULL)
+ return -1;
+ os_memcpy(name->alt_email, pos, len);
+ if (os_strlen(name->alt_email) != len) {
+ wpa_printf(MSG_INFO, "X509: Reject certificate with "
+ "embedded NUL byte in rfc822Name (%s[NUL])",
+ name->alt_email);
+ os_free(name->alt_email);
+ name->alt_email = NULL;
+ return -1;
+ }
+ return 0;
+}
+
+
+static int x509_parse_alt_name_dns(struct x509_name *name,
+ const u8 *pos, size_t len)
+{
+ /* dNSName IA5String */
+ wpa_hexdump_ascii(MSG_MSGDUMP, "X509: altName - dNSName", pos, len);
+ os_free(name->dns);
+ name->dns = os_zalloc(len + 1);
+ if (name->dns == NULL)
+ return -1;
+ os_memcpy(name->dns, pos, len);
+ if (os_strlen(name->dns) != len) {
+ wpa_printf(MSG_INFO, "X509: Reject certificate with "
+ "embedded NUL byte in dNSName (%s[NUL])",
+ name->dns);
+ os_free(name->dns);
+ name->dns = NULL;
+ return -1;
+ }
+ return 0;
+}
+
+
+static int x509_parse_alt_name_uri(struct x509_name *name,
+ const u8 *pos, size_t len)
+{
+ /* uniformResourceIdentifier IA5String */
+ wpa_hexdump_ascii(MSG_MSGDUMP,
+ "X509: altName - uniformResourceIdentifier",
+ pos, len);
+ os_free(name->uri);
+ name->uri = os_zalloc(len + 1);
+ if (name->uri == NULL)
+ return -1;
+ os_memcpy(name->uri, pos, len);
+ if (os_strlen(name->uri) != len) {
+ wpa_printf(MSG_INFO, "X509: Reject certificate with "
+ "embedded NUL byte in uniformResourceIdentifier "
+ "(%s[NUL])", name->uri);
+ os_free(name->uri);
+ name->uri = NULL;
+ return -1;
+ }
+ return 0;
+}
+
+
+static int x509_parse_alt_name_ip(struct x509_name *name,
+ const u8 *pos, size_t len)
+{
+ /* iPAddress OCTET STRING */
+ wpa_hexdump(MSG_MSGDUMP, "X509: altName - iPAddress", pos, len);
+ os_free(name->ip);
+ name->ip = os_malloc(len);
+ if (name->ip == NULL)
+ return -1;
+ os_memcpy(name->ip, pos, len);
+ name->ip_len = len;
+ return 0;
+}
+
+
+static int x509_parse_alt_name_rid(struct x509_name *name,
+ const u8 *pos, size_t len)
+{
+ char buf[80];
+
+ /* registeredID OBJECT IDENTIFIER */
+ if (asn1_parse_oid(pos, len, &name->rid) < 0)
+ return -1;
+
+ asn1_oid_to_str(&name->rid, buf, sizeof(buf));
+ wpa_printf(MSG_MSGDUMP, "X509: altName - registeredID: %s", buf);
+
+ return 0;
+}
+
+
+static int x509_parse_ext_alt_name(struct x509_name *name,
+ const u8 *pos, size_t len)
+{
+ struct asn1_hdr hdr;
+ const u8 *p, *end;
+
+ /*
+ * GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
+ *
+ * GeneralName ::= CHOICE {
+ * otherName [0] OtherName,
+ * rfc822Name [1] IA5String,
+ * dNSName [2] IA5String,
+ * x400Address [3] ORAddress,
+ * directoryName [4] Name,
+ * ediPartyName [5] EDIPartyName,
+ * uniformResourceIdentifier [6] IA5String,
+ * iPAddress [7] OCTET STRING,
+ * registeredID [8] OBJECT IDENTIFIER }
+ *
+ * OtherName ::= SEQUENCE {
+ * type-id OBJECT IDENTIFIER,
+ * value [0] EXPLICIT ANY DEFINED BY type-id }
+ *
+ * EDIPartyName ::= SEQUENCE {
+ * nameAssigner [0] DirectoryString OPTIONAL,
+ * partyName [1] DirectoryString }
+ */
+
+ for (p = pos, end = pos + len; p < end; p = hdr.payload + hdr.length) {
+ int res;
+
+ if (asn1_get_next(p, end - p, &hdr) < 0) {
+ wpa_printf(MSG_DEBUG, "X509: Failed to parse "
+ "SubjectAltName item");
+ return -1;
+ }
+
+ if (hdr.class != ASN1_CLASS_CONTEXT_SPECIFIC)
+ continue;
+
+ switch (hdr.tag) {
+ case 1:
+ res = x509_parse_alt_name_rfc8222(name, hdr.payload,
+ hdr.length);
+ break;
+ case 2:
+ res = x509_parse_alt_name_dns(name, hdr.payload,
+ hdr.length);
+ break;
+ case 6:
+ res = x509_parse_alt_name_uri(name, hdr.payload,
+ hdr.length);
+ break;
+ case 7:
+ res = x509_parse_alt_name_ip(name, hdr.payload,
+ hdr.length);
+ break;
+ case 8:
+ res = x509_parse_alt_name_rid(name, hdr.payload,
+ hdr.length);
+ break;
+ case 0: /* TODO: otherName */
+ case 3: /* TODO: x500Address */
+ case 4: /* TODO: directoryName */
+ case 5: /* TODO: ediPartyName */
+ default:
+ res = 0;
+ break;
+ }
+ if (res < 0)
+ return res;
+ }
+
+ return 0;
+}
+
+
+static int x509_parse_ext_subject_alt_name(struct x509_certificate *cert,
+ const u8 *pos, size_t len)
+{
+ struct asn1_hdr hdr;
+
+ /* SubjectAltName ::= GeneralNames */
+
+ if (asn1_get_next(pos, len, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE in "
+ "SubjectAltName; found %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+
+ wpa_printf(MSG_DEBUG, "X509: SubjectAltName");
+ cert->extensions_present |= X509_EXT_SUBJECT_ALT_NAME;
+
+ if (hdr.length == 0)
+ return 0;
+
+ return x509_parse_ext_alt_name(&cert->subject, hdr.payload,
+ hdr.length);
+}
+
+
+static int x509_parse_ext_issuer_alt_name(struct x509_certificate *cert,
+ const u8 *pos, size_t len)
+{
+ struct asn1_hdr hdr;
+
+ /* IssuerAltName ::= GeneralNames */
+
+ if (asn1_get_next(pos, len, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE in "
+ "IssuerAltName; found %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+
+ wpa_printf(MSG_DEBUG, "X509: IssuerAltName");
+ cert->extensions_present |= X509_EXT_ISSUER_ALT_NAME;
+
+ if (hdr.length == 0)
+ return 0;
+
+ return x509_parse_ext_alt_name(&cert->issuer, hdr.payload,
+ hdr.length);
+}
+
+
+static int x509_parse_extension_data(struct x509_certificate *cert,
+ struct asn1_oid *oid,
+ const u8 *pos, size_t len)
+{
+ if (!x509_id_ce_oid(oid))
+ return 1;
+
+ /* TODO: add other extensions required by RFC 3280, Ch 4.2:
+ * certificate policies (section 4.2.1.5)
+ * name constraints (section 4.2.1.11)
+ * policy constraints (section 4.2.1.12)
+ * extended key usage (section 4.2.1.13)
+ * inhibit any-policy (section 4.2.1.15)
+ */
+ switch (oid->oid[3]) {
+ case 15: /* id-ce-keyUsage */
+ return x509_parse_ext_key_usage(cert, pos, len);
+ case 17: /* id-ce-subjectAltName */
+ return x509_parse_ext_subject_alt_name(cert, pos, len);
+ case 18: /* id-ce-issuerAltName */
+ return x509_parse_ext_issuer_alt_name(cert, pos, len);
+ case 19: /* id-ce-basicConstraints */
+ return x509_parse_ext_basic_constraints(cert, pos, len);
+ default:
+ return 1;
+ }
+}
+
+
+static int x509_parse_extension(struct x509_certificate *cert,
+ const u8 *pos, size_t len, const u8 **next)
+{
+ const u8 *end;
+ struct asn1_hdr hdr;
+ struct asn1_oid oid;
+ int critical_ext = 0, res;
+ char buf[80];
+
+ /*
+ * Extension ::= SEQUENCE {
+ * extnID OBJECT IDENTIFIER,
+ * critical BOOLEAN DEFAULT FALSE,
+ * extnValue OCTET STRING
+ * }
+ */
+
+ if (asn1_get_next(pos, len, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG, "X509: Unexpected ASN.1 header in "
+ "Extensions: class %d tag 0x%x; expected SEQUENCE",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+ pos = hdr.payload;
+ *next = end = pos + hdr.length;
+
+ if (asn1_get_oid(pos, end - pos, &oid, &pos) < 0) {
+ wpa_printf(MSG_DEBUG, "X509: Unexpected ASN.1 data for "
+ "Extension (expected OID)");
+ return -1;
+ }
+
+ if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ (hdr.tag != ASN1_TAG_BOOLEAN &&
+ hdr.tag != ASN1_TAG_OCTETSTRING)) {
+ wpa_printf(MSG_DEBUG, "X509: Unexpected ASN.1 header in "
+ "Extensions: class %d tag 0x%x; expected BOOLEAN "
+ "or OCTET STRING", hdr.class, hdr.tag);
+ return -1;
+ }
+
+ if (hdr.tag == ASN1_TAG_BOOLEAN) {
+ if (hdr.length != 1) {
+ wpa_printf(MSG_DEBUG, "X509: Unexpected "
+ "Boolean length (%u)", hdr.length);
+ return -1;
+ }
+ critical_ext = hdr.payload[0];
+ pos = hdr.payload;
+ if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
+ (hdr.class != ASN1_CLASS_UNIVERSAL &&
+ hdr.class != ASN1_CLASS_PRIVATE) ||
+ hdr.tag != ASN1_TAG_OCTETSTRING) {
+ wpa_printf(MSG_DEBUG, "X509: Unexpected ASN.1 header "
+ "in Extensions: class %d tag 0x%x; "
+ "expected OCTET STRING",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+ }
+
+ asn1_oid_to_str(&oid, buf, sizeof(buf));
+ wpa_printf(MSG_DEBUG, "X509: Extension: extnID=%s critical=%d",
+ buf, critical_ext);
+ wpa_hexdump(MSG_MSGDUMP, "X509: extnValue", hdr.payload, hdr.length);
+
+ res = x509_parse_extension_data(cert, &oid, hdr.payload, hdr.length);
+ if (res < 0)
+ return res;
+ if (res == 1 && critical_ext) {
+ wpa_printf(MSG_INFO, "X509: Unknown critical extension %s",
+ buf);
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static int x509_parse_extensions(struct x509_certificate *cert,
+ const u8 *pos, size_t len)
+{
+ const u8 *end;
+ struct asn1_hdr hdr;
+
+ /* Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension */
+
+ if (asn1_get_next(pos, len, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG, "X509: Unexpected ASN.1 data "
+ "for Extensions: class %d tag 0x%x; "
+ "expected SEQUENCE", hdr.class, hdr.tag);
+ return -1;
+ }
+
+ pos = hdr.payload;
+ end = pos + hdr.length;
+
+ while (pos < end) {
+ if (x509_parse_extension(cert, pos, end - pos, &pos)
+ < 0)
+ return -1;
+ }
+
+ return 0;
+}
+
+
+static int x509_parse_tbs_certificate(const u8 *buf, size_t len,
+ struct x509_certificate *cert,
+ const u8 **next)
+{
+ struct asn1_hdr hdr;
+ const u8 *pos, *end;
+ size_t left;
+ char sbuf[128];
+ unsigned long value;
+
+ /* tbsCertificate TBSCertificate ::= SEQUENCE */
+ if (asn1_get_next(buf, len, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG, "X509: tbsCertificate did not start "
+ "with a valid SEQUENCE - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+ pos = hdr.payload;
+ end = *next = pos + hdr.length;
+
+ /*
+ * version [0] EXPLICIT Version DEFAULT v1
+ * Version ::= INTEGER { v1(0), v2(1), v3(2) }
+ */
+ if (asn1_get_next(pos, end - pos, &hdr) < 0)
+ return -1;
+ pos = hdr.payload;
+
+ if (hdr.class == ASN1_CLASS_CONTEXT_SPECIFIC) {
+ if (asn1_get_next(pos, end - pos, &hdr) < 0)
+ return -1;
+
+ if (hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_INTEGER) {
+ wpa_printf(MSG_DEBUG, "X509: No INTEGER tag found for "
+ "version field - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+ if (hdr.length != 1) {
+ wpa_printf(MSG_DEBUG, "X509: Unexpected version field "
+ "length %u (expected 1)", hdr.length);
+ return -1;
+ }
+ pos = hdr.payload;
+ left = hdr.length;
+ value = 0;
+ while (left) {
+ value <<= 8;
+ value |= *pos++;
+ left--;
+ }
+
+ cert->version = value;
+ if (cert->version != X509_CERT_V1 &&
+ cert->version != X509_CERT_V2 &&
+ cert->version != X509_CERT_V3) {
+ wpa_printf(MSG_DEBUG, "X509: Unsupported version %d",
+ cert->version + 1);
+ return -1;
+ }
+
+ if (asn1_get_next(pos, end - pos, &hdr) < 0)
+ return -1;
+ } else
+ cert->version = X509_CERT_V1;
+ wpa_printf(MSG_MSGDUMP, "X509: Version X.509v%d", cert->version + 1);
+
+ /* serialNumber CertificateSerialNumber ::= INTEGER */
+ if (hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_INTEGER) {
+ wpa_printf(MSG_DEBUG, "X509: No INTEGER tag found for "
+ "serialNumber; class=%d tag=0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+
+ pos = hdr.payload;
+ left = hdr.length;
+ while (left) {
+ cert->serial_number <<= 8;
+ cert->serial_number |= *pos++;
+ left--;
+ }
+ wpa_printf(MSG_MSGDUMP, "X509: serialNumber %lu", cert->serial_number);
+
+ /* signature AlgorithmIdentifier */
+ if (x509_parse_algorithm_identifier(pos, end - pos, &cert->signature,
+ &pos))
+ return -1;
+
+ /* issuer Name */
+ if (x509_parse_name(pos, end - pos, &cert->issuer, &pos))
+ return -1;
+ x509_name_string(&cert->issuer, sbuf, sizeof(sbuf));
+ wpa_printf(MSG_MSGDUMP, "X509: issuer %s", sbuf);
+
+ /* validity Validity */
+ if (x509_parse_validity(pos, end - pos, cert, &pos))
+ return -1;
+
+ /* subject Name */
+ if (x509_parse_name(pos, end - pos, &cert->subject, &pos))
+ return -1;
+ x509_name_string(&cert->subject, sbuf, sizeof(sbuf));
+ wpa_printf(MSG_MSGDUMP, "X509: subject %s", sbuf);
+
+ /* subjectPublicKeyInfo SubjectPublicKeyInfo */
+ if (x509_parse_public_key(pos, end - pos, cert, &pos))
+ return -1;
+
+ if (pos == end)
+ return 0;
+
+ if (cert->version == X509_CERT_V1)
+ return 0;
+
+ if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_CONTEXT_SPECIFIC) {
+ wpa_printf(MSG_DEBUG, "X509: Expected Context-Specific"
+ " tag to parse optional tbsCertificate "
+ "field(s); parsed class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+
+ if (hdr.tag == 1) {
+ /* issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL */
+ wpa_printf(MSG_DEBUG, "X509: issuerUniqueID");
+ /* TODO: parse UniqueIdentifier ::= BIT STRING */
+
+ if (hdr.payload + hdr.length == end)
+ return 0;
+
+ if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_CONTEXT_SPECIFIC) {
+ wpa_printf(MSG_DEBUG, "X509: Expected Context-Specific"
+ " tag to parse optional tbsCertificate "
+ "field(s); parsed class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+ }
+
+ if (hdr.tag == 2) {
+ /* subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL */
+ wpa_printf(MSG_DEBUG, "X509: subjectUniqueID");
+ /* TODO: parse UniqueIdentifier ::= BIT STRING */
+
+ if (hdr.payload + hdr.length == end)
+ return 0;
+
+ if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_CONTEXT_SPECIFIC) {
+ wpa_printf(MSG_DEBUG, "X509: Expected Context-Specific"
+ " tag to parse optional tbsCertificate "
+ "field(s); parsed class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+ }
+
+ if (hdr.tag != 3) {
+ wpa_printf(MSG_DEBUG, "X509: Ignored unexpected "
+ "Context-Specific tag %d in optional "
+ "tbsCertificate fields", hdr.tag);
+ return 0;
+ }
+
+ /* extensions [3] EXPLICIT Extensions OPTIONAL */
+
+ if (cert->version != X509_CERT_V3) {
+ wpa_printf(MSG_DEBUG, "X509: X.509%d certificate and "
+ "Extensions data which are only allowed for "
+ "version 3", cert->version + 1);
+ return -1;
+ }
+
+ if (x509_parse_extensions(cert, hdr.payload, hdr.length) < 0)
+ return -1;
+
+ pos = hdr.payload + hdr.length;
+ if (pos < end) {
+ wpa_hexdump(MSG_DEBUG,
+ "X509: Ignored extra tbsCertificate data",
+ pos, end - pos);
+ }
+
+ return 0;
+}
+
+
+static int x509_rsadsi_oid(struct asn1_oid *oid)
+{
+ return oid->len >= 4 &&
+ oid->oid[0] == 1 /* iso */ &&
+ oid->oid[1] == 2 /* member-body */ &&
+ oid->oid[2] == 840 /* us */ &&
+ oid->oid[3] == 113549 /* rsadsi */;
+}
+
+
+static int x509_pkcs_oid(struct asn1_oid *oid)
+{
+ return oid->len >= 5 &&
+ x509_rsadsi_oid(oid) &&
+ oid->oid[4] == 1 /* pkcs */;
+}
+
+
+static int x509_digest_oid(struct asn1_oid *oid)
+{
+ return oid->len >= 5 &&
+ x509_rsadsi_oid(oid) &&
+ oid->oid[4] == 2 /* digestAlgorithm */;
+}
+
+
+static int x509_sha1_oid(struct asn1_oid *oid)
+{
+ return oid->len == 6 &&
+ oid->oid[0] == 1 /* iso */ &&
+ oid->oid[1] == 3 /* identified-organization */ &&
+ oid->oid[2] == 14 /* oiw */ &&
+ oid->oid[3] == 3 /* secsig */ &&
+ oid->oid[4] == 2 /* algorithms */ &&
+ oid->oid[5] == 26 /* id-sha1 */;
+}
+
+
+static int x509_sha256_oid(struct asn1_oid *oid)
+{
+ return oid->len == 9 &&
+ oid->oid[0] == 2 /* joint-iso-itu-t */ &&
+ oid->oid[1] == 16 /* country */ &&
+ oid->oid[2] == 840 /* us */ &&
+ oid->oid[3] == 1 /* organization */ &&
+ oid->oid[4] == 101 /* gov */ &&
+ oid->oid[5] == 3 /* csor */ &&
+ oid->oid[6] == 4 /* nistAlgorithm */ &&
+ oid->oid[7] == 2 /* hashAlgs */ &&
+ oid->oid[8] == 1 /* sha256 */;
+}
+
+
+/**
+ * x509_certificate_parse - Parse a X.509 certificate in DER format
+ * @buf: Pointer to the X.509 certificate in DER format
+ * @len: Buffer length
+ * Returns: Pointer to the parsed certificate or %NULL on failure
+ *
+ * Caller is responsible for freeing the returned certificate by calling
+ * x509_certificate_free().
+ */
+struct x509_certificate * x509_certificate_parse(const u8 *buf, size_t len)
+{
+ struct asn1_hdr hdr;
+ const u8 *pos, *end, *hash_start;
+ struct x509_certificate *cert;
+
+ cert = os_zalloc(sizeof(*cert) + len);
+ if (cert == NULL)
+ return NULL;
+ os_memcpy(cert + 1, buf, len);
+ cert->cert_start = (u8 *) (cert + 1);
+ cert->cert_len = len;
+
+ pos = buf;
+ end = buf + len;
+
+ /* RFC 3280 - X.509 v3 certificate / ASN.1 DER */
+
+ /* Certificate ::= SEQUENCE */
+ if (asn1_get_next(pos, len, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG, "X509: Certificate did not start with "
+ "a valid SEQUENCE - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ x509_certificate_free(cert);
+ return NULL;
+ }
+ pos = hdr.payload;
+
+ if (pos + hdr.length > end) {
+ x509_certificate_free(cert);
+ return NULL;
+ }
+
+ if (pos + hdr.length < end) {
+ wpa_hexdump(MSG_MSGDUMP, "X509: Ignoring extra data after DER "
+ "encoded certificate",
+ pos + hdr.length, end - pos + hdr.length);
+ end = pos + hdr.length;
+ }
+
+ hash_start = pos;
+ cert->tbs_cert_start = cert->cert_start + (hash_start - buf);
+ if (x509_parse_tbs_certificate(pos, end - pos, cert, &pos)) {
+ x509_certificate_free(cert);
+ return NULL;
+ }
+ cert->tbs_cert_len = pos - hash_start;
+
+ /* signatureAlgorithm AlgorithmIdentifier */
+ if (x509_parse_algorithm_identifier(pos, end - pos,
+ &cert->signature_alg, &pos)) {
+ x509_certificate_free(cert);
+ return NULL;
+ }
+
+ /* signatureValue BIT STRING */
+ if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_BITSTRING) {
+ wpa_printf(MSG_DEBUG, "X509: Expected BITSTRING "
+ "(signatureValue) - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ x509_certificate_free(cert);
+ return NULL;
+ }
+ if (hdr.length < 1) {
+ x509_certificate_free(cert);
+ return NULL;
+ }
+ pos = hdr.payload;
+ if (*pos) {
+ wpa_printf(MSG_DEBUG, "X509: BITSTRING - %d unused bits",
+ *pos);
+ /* PKCS #1 v1.5 10.2.1:
+ * It is an error if the length in bits of the signature S is
+ * not a multiple of eight.
+ */
+ x509_certificate_free(cert);
+ return NULL;
+ }
+ os_free(cert->sign_value);
+ cert->sign_value = os_malloc(hdr.length - 1);
+ if (cert->sign_value == NULL) {
+ wpa_printf(MSG_DEBUG, "X509: Failed to allocate memory for "
+ "signatureValue");
+ x509_certificate_free(cert);
+ return NULL;
+ }
+ os_memcpy(cert->sign_value, pos + 1, hdr.length - 1);
+ cert->sign_value_len = hdr.length - 1;
+ wpa_hexdump(MSG_MSGDUMP, "X509: signature",
+ cert->sign_value, cert->sign_value_len);
+
+ return cert;
+}
+
+
+/**
+ * x509_certificate_check_signature - Verify certificate signature
+ * @issuer: Issuer certificate
+ * @cert: Certificate to be verified
+ * Returns: 0 if cert has a valid signature that was signed by the issuer,
+ * -1 if not
+ */
+int x509_certificate_check_signature(struct x509_certificate *issuer,
+ struct x509_certificate *cert)
+{
+ struct crypto_public_key *pk;
+ u8 *data;
+ const u8 *pos, *end, *next, *da_end;
+ size_t data_len;
+ struct asn1_hdr hdr;
+ struct asn1_oid oid;
+ u8 hash[32];
+ size_t hash_len;
+
+ if (!x509_pkcs_oid(&cert->signature.oid) ||
+ cert->signature.oid.len != 7 ||
+ cert->signature.oid.oid[5] != 1 /* pkcs-1 */) {
+ wpa_printf(MSG_DEBUG, "X509: Unrecognized signature "
+ "algorithm");
+ return -1;
+ }
+
+ pk = crypto_public_key_import(issuer->public_key,
+ issuer->public_key_len);
+ if (pk == NULL)
+ return -1;
+
+ data_len = cert->sign_value_len;
+ data = os_malloc(data_len);
+ if (data == NULL) {
+ crypto_public_key_free(pk);
+ return -1;
+ }
+
+ if (crypto_public_key_decrypt_pkcs1(pk, cert->sign_value,
+ cert->sign_value_len, data,
+ &data_len) < 0) {
+ wpa_printf(MSG_DEBUG, "X509: Failed to decrypt signature");
+ crypto_public_key_free(pk);
+ os_free(data);
+ return -1;
+ }
+ crypto_public_key_free(pk);
+
+ wpa_hexdump(MSG_MSGDUMP, "X509: Signature data D", data, data_len);
+
+ /*
+ * PKCS #1 v1.5, 10.1.2:
+ *
+ * DigestInfo ::= SEQUENCE {
+ * digestAlgorithm DigestAlgorithmIdentifier,
+ * digest Digest
+ * }
+ *
+ * DigestAlgorithmIdentifier ::= AlgorithmIdentifier
+ *
+ * Digest ::= OCTET STRING
+ *
+ */
+ if (asn1_get_next(data, data_len, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE "
+ "(DigestInfo) - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ os_free(data);
+ return -1;
+ }
+
+ pos = hdr.payload;
+ end = pos + hdr.length;
+
+ /*
+ * X.509:
+ * AlgorithmIdentifier ::= SEQUENCE {
+ * algorithm OBJECT IDENTIFIER,
+ * parameters ANY DEFINED BY algorithm OPTIONAL
+ * }
+ */
+
+ if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG, "X509: Expected SEQUENCE "
+ "(AlgorithmIdentifier) - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ os_free(data);
+ return -1;
+ }
+ da_end = hdr.payload + hdr.length;
+
+ if (asn1_get_oid(hdr.payload, hdr.length, &oid, &next)) {
+ wpa_printf(MSG_DEBUG, "X509: Failed to parse digestAlgorithm");
+ os_free(data);
+ return -1;
+ }
+
+ if (x509_sha1_oid(&oid)) {
+ if (cert->signature.oid.oid[6] !=
+ 5 /* sha-1WithRSAEncryption */) {
+ wpa_printf(MSG_DEBUG, "X509: digestAlgorithm SHA1 "
+ "does not match with certificate "
+ "signatureAlgorithm (%lu)",
+ cert->signature.oid.oid[6]);
+ os_free(data);
+ return -1;
+ }
+ goto skip_digest_oid;
+ }
+
+ if (x509_sha256_oid(&oid)) {
+ if (cert->signature.oid.oid[6] !=
+ 11 /* sha2561WithRSAEncryption */) {
+ wpa_printf(MSG_DEBUG, "X509: digestAlgorithm SHA256 "
+ "does not match with certificate "
+ "signatureAlgorithm (%lu)",
+ cert->signature.oid.oid[6]);
+ os_free(data);
+ return -1;
+ }
+ goto skip_digest_oid;
+ }
+
+ if (!x509_digest_oid(&oid)) {
+ wpa_printf(MSG_DEBUG, "X509: Unrecognized digestAlgorithm");
+ os_free(data);
+ return -1;
+ }
+ switch (oid.oid[5]) {
+ case 5: /* md5 */
+ if (cert->signature.oid.oid[6] != 4 /* md5WithRSAEncryption */)
+ {
+ wpa_printf(MSG_DEBUG, "X509: digestAlgorithm MD5 does "
+ "not match with certificate "
+ "signatureAlgorithm (%lu)",
+ cert->signature.oid.oid[6]);
+ os_free(data);
+ return -1;
+ }
+ break;
+ case 2: /* md2 */
+ case 4: /* md4 */
+ default:
+ wpa_printf(MSG_DEBUG, "X509: Unsupported digestAlgorithm "
+ "(%lu)", oid.oid[5]);
+ os_free(data);
+ return -1;
+ }
+
+skip_digest_oid:
+ /* Digest ::= OCTET STRING */
+ pos = da_end;
+ end = data + data_len;
+
+ if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_OCTETSTRING) {
+ wpa_printf(MSG_DEBUG, "X509: Expected OCTETSTRING "
+ "(Digest) - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ os_free(data);
+ return -1;
+ }
+ wpa_hexdump(MSG_MSGDUMP, "X509: Decrypted Digest",
+ hdr.payload, hdr.length);
+
+ switch (cert->signature.oid.oid[6]) {
+ case 4: /* md5WithRSAEncryption */
+ md5_vector(1, &cert->tbs_cert_start, &cert->tbs_cert_len,
+ hash);
+ hash_len = 16;
+ wpa_hexdump(MSG_MSGDUMP, "X509: Certificate hash (MD5)",
+ hash, hash_len);
+ break;
+ case 5: /* sha-1WithRSAEncryption */
+ sha1_vector(1, &cert->tbs_cert_start, &cert->tbs_cert_len,
+ hash);
+ hash_len = 20;
+ wpa_hexdump(MSG_MSGDUMP, "X509: Certificate hash (SHA1)",
+ hash, hash_len);
+ break;
+ case 11: /* sha256WithRSAEncryption */
+ sha256_vector(1, &cert->tbs_cert_start, &cert->tbs_cert_len,
+ hash);
+ hash_len = 32;
+ wpa_hexdump(MSG_MSGDUMP, "X509: Certificate hash (SHA256)",
+ hash, hash_len);
+ break;
+ case 2: /* md2WithRSAEncryption */
+ case 12: /* sha384WithRSAEncryption */
+ case 13: /* sha512WithRSAEncryption */
+ default:
+ wpa_printf(MSG_INFO, "X509: Unsupported certificate signature "
+ "algorithm (%lu)", cert->signature.oid.oid[6]);
+ os_free(data);
+ return -1;
+ }
+
+ if (hdr.length != hash_len ||
+ os_memcmp(hdr.payload, hash, hdr.length) != 0) {
+ wpa_printf(MSG_INFO, "X509: Certificate Digest does not match "
+ "with calculated tbsCertificate hash");
+ os_free(data);
+ return -1;
+ }
+
+ os_free(data);
+
+ wpa_printf(MSG_DEBUG, "X509: Certificate Digest matches with "
+ "calculated tbsCertificate hash");
+
+ return 0;
+}
+
+
+static int x509_valid_issuer(const struct x509_certificate *cert)
+{
+ if ((cert->extensions_present & X509_EXT_BASIC_CONSTRAINTS) &&
+ !cert->ca) {
+ wpa_printf(MSG_DEBUG, "X509: Non-CA certificate used as an "
+ "issuer");
+ return -1;
+ }
+
+ if (cert->version == X509_CERT_V3 &&
+ !(cert->extensions_present & X509_EXT_BASIC_CONSTRAINTS)) {
+ wpa_printf(MSG_DEBUG, "X509: v3 CA certificate did not "
+ "include BasicConstraints extension");
+ return -1;
+ }
+
+ if ((cert->extensions_present & X509_EXT_KEY_USAGE) &&
+ !(cert->key_usage & X509_KEY_USAGE_KEY_CERT_SIGN)) {
+ wpa_printf(MSG_DEBUG, "X509: Issuer certificate did not have "
+ "keyCertSign bit in Key Usage");
+ return -1;
+ }
+
+ return 0;
+}
+
+
+/**
+ * x509_certificate_chain_validate - Validate X.509 certificate chain
+ * @trusted: List of trusted certificates
+ * @chain: Certificate chain to be validated (first chain must be issued by
+ * signed by the second certificate in the chain and so on)
+ * @reason: Buffer for returning failure reason (X509_VALIDATE_*)
+ * Returns: 0 if chain is valid, -1 if not
+ */
+int x509_certificate_chain_validate(struct x509_certificate *trusted,
+ struct x509_certificate *chain,
+ int *reason)
+{
+ long unsigned idx;
+ int chain_trusted = 0;
+ struct x509_certificate *cert, *trust;
+ char buf[128];
+ struct os_time now;
+
+ *reason = X509_VALIDATE_OK;
+
+ wpa_printf(MSG_DEBUG, "X509: Validate certificate chain");
+ os_get_time(&now);
+
+ for (cert = chain, idx = 0; cert; cert = cert->next, idx++) {
+ x509_name_string(&cert->subject, buf, sizeof(buf));
+ wpa_printf(MSG_DEBUG, "X509: %lu: %s", idx, buf);
+
+ if (chain_trusted)
+ continue;
+
+ if ((unsigned long) now.sec <
+ (unsigned long) cert->not_before ||
+ (unsigned long) now.sec >
+ (unsigned long) cert->not_after) {
+ wpa_printf(MSG_INFO, "X509: Certificate not valid "
+ "(now=%lu not_before=%lu not_after=%lu)",
+ now.sec, cert->not_before, cert->not_after);
+ *reason = X509_VALIDATE_CERTIFICATE_EXPIRED;
+ return -1;
+ }
+
+ if (cert->next) {
+ if (x509_name_compare(&cert->issuer,
+ &cert->next->subject) != 0) {
+ wpa_printf(MSG_DEBUG, "X509: Certificate "
+ "chain issuer name mismatch");
+ x509_name_string(&cert->issuer, buf,
+ sizeof(buf));
+ wpa_printf(MSG_DEBUG, "X509: cert issuer: %s",
+ buf);
+ x509_name_string(&cert->next->subject, buf,
+ sizeof(buf));
+ wpa_printf(MSG_DEBUG, "X509: next cert "
+ "subject: %s", buf);
+ *reason = X509_VALIDATE_CERTIFICATE_UNKNOWN;
+ return -1;
+ }
+
+ if (x509_valid_issuer(cert->next) < 0) {
+ *reason = X509_VALIDATE_BAD_CERTIFICATE;
+ return -1;
+ }
+
+ if ((cert->next->extensions_present &
+ X509_EXT_PATH_LEN_CONSTRAINT) &&
+ idx > cert->next->path_len_constraint) {
+ wpa_printf(MSG_DEBUG, "X509: pathLenConstraint"
+ " not met (idx=%lu issuer "
+ "pathLenConstraint=%lu)", idx,
+ cert->next->path_len_constraint);
+ *reason = X509_VALIDATE_BAD_CERTIFICATE;
+ return -1;
+ }
+
+ if (x509_certificate_check_signature(cert->next, cert)
+ < 0) {
+ wpa_printf(MSG_DEBUG, "X509: Invalid "
+ "certificate signature within "
+ "chain");
+ *reason = X509_VALIDATE_BAD_CERTIFICATE;
+ return -1;
+ }
+ }
+
+ for (trust = trusted; trust; trust = trust->next) {
+ if (x509_name_compare(&cert->issuer, &trust->subject)
+ == 0)
+ break;
+ }
+
+ if (trust) {
+ wpa_printf(MSG_DEBUG, "X509: Found issuer from the "
+ "list of trusted certificates");
+ if (x509_valid_issuer(trust) < 0) {
+ *reason = X509_VALIDATE_BAD_CERTIFICATE;
+ return -1;
+ }
+
+ if (x509_certificate_check_signature(trust, cert) < 0)
+ {
+ wpa_printf(MSG_DEBUG, "X509: Invalid "
+ "certificate signature");
+ *reason = X509_VALIDATE_BAD_CERTIFICATE;
+ return -1;
+ }
+
+ wpa_printf(MSG_DEBUG, "X509: Trusted certificate "
+ "found to complete the chain");
+ chain_trusted = 1;
+ }
+ }
+
+ if (!chain_trusted) {
+ wpa_printf(MSG_DEBUG, "X509: Did not find any of the issuers "
+ "from the list of trusted certificates");
+ if (trusted) {
+ *reason = X509_VALIDATE_UNKNOWN_CA;
+ return -1;
+ }
+ wpa_printf(MSG_DEBUG, "X509: Certificate chain validation "
+ "disabled - ignore unknown CA issue");
+ }
+
+ wpa_printf(MSG_DEBUG, "X509: Certificate chain valid");
+
+ return 0;
+}
+
+
+/**
+ * x509_certificate_get_subject - Get a certificate based on Subject name
+ * @chain: Certificate chain to search through
+ * @name: Subject name to search for
+ * Returns: Pointer to the certificate with the given Subject name or
+ * %NULL on failure
+ */
+struct x509_certificate *
+x509_certificate_get_subject(struct x509_certificate *chain,
+ struct x509_name *name)
+{
+ struct x509_certificate *cert;
+
+ for (cert = chain; cert; cert = cert->next) {
+ if (x509_name_compare(&cert->subject, name) == 0)
+ return cert;
+ }
+ return NULL;
+}
+
+
+/**
+ * x509_certificate_self_signed - Is the certificate self-signed?
+ * @cert: Certificate
+ * Returns: 1 if certificate is self-signed, 0 if not
+ */
+int x509_certificate_self_signed(struct x509_certificate *cert)
+{
+ return x509_name_compare(&cert->issuer, &cert->subject) == 0;
+}
projects / mech_eap.orig / blobdiff