| /* |
| * X.509 base functions for creating certificates / CSRs |
| * |
| * Copyright The Mbed TLS Contributors |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may |
| * not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "common.h" |
| |
| #if defined(MBEDTLS_X509_CREATE_C) |
| |
| #include "mbedtls/x509.h" |
| #include "mbedtls/asn1write.h" |
| #include "mbedtls/error.h" |
| #include "mbedtls/oid.h" |
| |
| #include <string.h> |
| |
| /* Structure linking OIDs for X.509 DN AttributeTypes to their |
| * string representations and default string encodings used by Mbed TLS. */ |
| typedef struct { |
| const char *name; /* String representation of AttributeType, e.g. |
| * "CN" or "emailAddress". */ |
| size_t name_len; /* Length of 'name', without trailing 0 byte. */ |
| const char *oid; /* String representation of OID of AttributeType, |
| * as per RFC 5280, Appendix A.1. */ |
| int default_tag; /* The default character encoding used for the |
| * given attribute type, e.g. |
| * MBEDTLS_ASN1_UTF8_STRING for UTF-8. */ |
| } x509_attr_descriptor_t; |
| |
| #define ADD_STRLEN(s) s, sizeof(s) - 1 |
| |
| /* X.509 DN attributes from RFC 5280, Appendix A.1. */ |
| static const x509_attr_descriptor_t x509_attrs[] = |
| { |
| { ADD_STRLEN("CN"), |
| MBEDTLS_OID_AT_CN, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("commonName"), |
| MBEDTLS_OID_AT_CN, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("C"), |
| MBEDTLS_OID_AT_COUNTRY, MBEDTLS_ASN1_PRINTABLE_STRING }, |
| { ADD_STRLEN("countryName"), |
| MBEDTLS_OID_AT_COUNTRY, MBEDTLS_ASN1_PRINTABLE_STRING }, |
| { ADD_STRLEN("O"), |
| MBEDTLS_OID_AT_ORGANIZATION, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("organizationName"), |
| MBEDTLS_OID_AT_ORGANIZATION, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("L"), |
| MBEDTLS_OID_AT_LOCALITY, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("locality"), |
| MBEDTLS_OID_AT_LOCALITY, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("R"), |
| MBEDTLS_OID_PKCS9_EMAIL, MBEDTLS_ASN1_IA5_STRING }, |
| { ADD_STRLEN("OU"), |
| MBEDTLS_OID_AT_ORG_UNIT, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("organizationalUnitName"), |
| MBEDTLS_OID_AT_ORG_UNIT, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("ST"), |
| MBEDTLS_OID_AT_STATE, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("stateOrProvinceName"), |
| MBEDTLS_OID_AT_STATE, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("emailAddress"), |
| MBEDTLS_OID_PKCS9_EMAIL, MBEDTLS_ASN1_IA5_STRING }, |
| { ADD_STRLEN("serialNumber"), |
| MBEDTLS_OID_AT_SERIAL_NUMBER, MBEDTLS_ASN1_PRINTABLE_STRING }, |
| { ADD_STRLEN("postalAddress"), |
| MBEDTLS_OID_AT_POSTAL_ADDRESS, MBEDTLS_ASN1_PRINTABLE_STRING }, |
| { ADD_STRLEN("postalCode"), |
| MBEDTLS_OID_AT_POSTAL_CODE, MBEDTLS_ASN1_PRINTABLE_STRING }, |
| { ADD_STRLEN("dnQualifier"), |
| MBEDTLS_OID_AT_DN_QUALIFIER, MBEDTLS_ASN1_PRINTABLE_STRING }, |
| { ADD_STRLEN("title"), |
| MBEDTLS_OID_AT_TITLE, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("surName"), |
| MBEDTLS_OID_AT_SUR_NAME, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("SN"), |
| MBEDTLS_OID_AT_SUR_NAME, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("givenName"), |
| MBEDTLS_OID_AT_GIVEN_NAME, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("GN"), |
| MBEDTLS_OID_AT_GIVEN_NAME, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("initials"), |
| MBEDTLS_OID_AT_INITIALS, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("pseudonym"), |
| MBEDTLS_OID_AT_PSEUDONYM, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("generationQualifier"), |
| MBEDTLS_OID_AT_GENERATION_QUALIFIER, MBEDTLS_ASN1_UTF8_STRING }, |
| { ADD_STRLEN("domainComponent"), |
| MBEDTLS_OID_DOMAIN_COMPONENT, MBEDTLS_ASN1_IA5_STRING }, |
| { ADD_STRLEN("DC"), |
| MBEDTLS_OID_DOMAIN_COMPONENT, MBEDTLS_ASN1_IA5_STRING }, |
| { NULL, 0, NULL, MBEDTLS_ASN1_NULL } |
| }; |
| |
| static const x509_attr_descriptor_t *x509_attr_descr_from_name(const char *name, size_t name_len) |
| { |
| const x509_attr_descriptor_t *cur; |
| |
| for (cur = x509_attrs; cur->name != NULL; cur++) { |
| if (cur->name_len == name_len && |
| strncmp(cur->name, name, name_len) == 0) { |
| break; |
| } |
| } |
| |
| if (cur->name == NULL) { |
| return NULL; |
| } |
| |
| return cur; |
| } |
| |
| int mbedtls_x509_string_to_names(mbedtls_asn1_named_data **head, const char *name) |
| { |
| int ret = 0; |
| const char *s = name, *c = s; |
| const char *end = s + strlen(s); |
| const char *oid = NULL; |
| const x509_attr_descriptor_t *attr_descr = NULL; |
| int in_tag = 1; |
| char data[MBEDTLS_X509_MAX_DN_NAME_SIZE]; |
| char *d = data; |
| |
| /* Clear existing chain if present */ |
| mbedtls_asn1_free_named_data_list(head); |
| |
| while (c <= end) { |
| if (in_tag && *c == '=') { |
| if ((attr_descr = x509_attr_descr_from_name(s, c - s)) == NULL) { |
| ret = MBEDTLS_ERR_X509_UNKNOWN_OID; |
| goto exit; |
| } |
| |
| oid = attr_descr->oid; |
| s = c + 1; |
| in_tag = 0; |
| d = data; |
| } |
| |
| if (!in_tag && *c == '\\' && c != end) { |
| c++; |
| |
| /* Check for valid escaped characters */ |
| if (c == end || *c != ',') { |
| ret = MBEDTLS_ERR_X509_INVALID_NAME; |
| goto exit; |
| } |
| } else if (!in_tag && (*c == ',' || c == end)) { |
| mbedtls_asn1_named_data *cur = |
| mbedtls_asn1_store_named_data(head, oid, strlen(oid), |
| (unsigned char *) data, |
| d - data); |
| |
| if (cur == NULL) { |
| return MBEDTLS_ERR_X509_ALLOC_FAILED; |
| } |
| |
| // set tagType |
| cur->val.tag = attr_descr->default_tag; |
| |
| while (c < end && *(c + 1) == ' ') { |
| c++; |
| } |
| |
| s = c + 1; |
| in_tag = 1; |
| } |
| |
| if (!in_tag && s != c + 1) { |
| *(d++) = *c; |
| |
| if (d - data == MBEDTLS_X509_MAX_DN_NAME_SIZE) { |
| ret = MBEDTLS_ERR_X509_INVALID_NAME; |
| goto exit; |
| } |
| } |
| |
| c++; |
| } |
| |
| exit: |
| |
| return ret; |
| } |
| |
| /* The first byte of the value in the mbedtls_asn1_named_data structure is reserved |
| * to store the critical boolean for us |
| */ |
| int mbedtls_x509_set_extension(mbedtls_asn1_named_data **head, const char *oid, size_t oid_len, |
| int critical, const unsigned char *val, size_t val_len) |
| { |
| mbedtls_asn1_named_data *cur; |
| |
| if ((cur = mbedtls_asn1_store_named_data(head, oid, oid_len, |
| NULL, val_len + 1)) == NULL) { |
| return MBEDTLS_ERR_X509_ALLOC_FAILED; |
| } |
| |
| cur->val.p[0] = critical; |
| memcpy(cur->val.p + 1, val, val_len); |
| |
| return 0; |
| } |
| |
| /* |
| * RelativeDistinguishedName ::= |
| * SET OF AttributeTypeAndValue |
| * |
| * AttributeTypeAndValue ::= SEQUENCE { |
| * type AttributeType, |
| * value AttributeValue } |
| * |
| * AttributeType ::= OBJECT IDENTIFIER |
| * |
| * AttributeValue ::= ANY DEFINED BY AttributeType |
| */ |
| static int x509_write_name(unsigned char **p, |
| unsigned char *start, |
| mbedtls_asn1_named_data *cur_name) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| size_t len = 0; |
| const char *oid = (const char *) cur_name->oid.p; |
| size_t oid_len = cur_name->oid.len; |
| const unsigned char *name = cur_name->val.p; |
| size_t name_len = cur_name->val.len; |
| |
| // Write correct string tag and value |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tagged_string(p, start, |
| cur_name->val.tag, |
| (const char *) name, |
| name_len)); |
| // Write OID |
| // |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_oid(p, start, oid, |
| oid_len)); |
| |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len)); |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, |
| MBEDTLS_ASN1_CONSTRUCTED | |
| MBEDTLS_ASN1_SEQUENCE)); |
| |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len)); |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, |
| MBEDTLS_ASN1_CONSTRUCTED | |
| MBEDTLS_ASN1_SET)); |
| |
| return (int) len; |
| } |
| |
| int mbedtls_x509_write_names(unsigned char **p, unsigned char *start, |
| mbedtls_asn1_named_data *first) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| size_t len = 0; |
| mbedtls_asn1_named_data *cur = first; |
| |
| while (cur != NULL) { |
| MBEDTLS_ASN1_CHK_ADD(len, x509_write_name(p, start, cur)); |
| cur = cur->next; |
| } |
| |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len)); |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_CONSTRUCTED | |
| MBEDTLS_ASN1_SEQUENCE)); |
| |
| return (int) len; |
| } |
| |
| int mbedtls_x509_write_sig(unsigned char **p, unsigned char *start, |
| const char *oid, size_t oid_len, |
| unsigned char *sig, size_t size) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| size_t len = 0; |
| |
| if (*p < start || (size_t) (*p - start) < size) { |
| return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL; |
| } |
| |
| len = size; |
| (*p) -= len; |
| memcpy(*p, sig, len); |
| |
| if (*p - start < 1) { |
| return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL; |
| } |
| |
| *--(*p) = 0; |
| len += 1; |
| |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len)); |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_BIT_STRING)); |
| |
| // Write OID |
| // |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_algorithm_identifier(p, start, oid, |
| oid_len, 0)); |
| |
| return (int) len; |
| } |
| |
| static int x509_write_extension(unsigned char **p, unsigned char *start, |
| mbedtls_asn1_named_data *ext) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| size_t len = 0; |
| |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_raw_buffer(p, start, ext->val.p + 1, |
| ext->val.len - 1)); |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, ext->val.len - 1)); |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_OCTET_STRING)); |
| |
| if (ext->val.p[0] != 0) { |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_bool(p, start, 1)); |
| } |
| |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_raw_buffer(p, start, ext->oid.p, |
| ext->oid.len)); |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, ext->oid.len)); |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_OID)); |
| |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len)); |
| MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_CONSTRUCTED | |
| MBEDTLS_ASN1_SEQUENCE)); |
| |
| return (int) len; |
| } |
| |
| /* |
| * Extension ::= SEQUENCE { |
| * extnID OBJECT IDENTIFIER, |
| * critical BOOLEAN DEFAULT FALSE, |
| * extnValue OCTET STRING |
| * -- contains the DER encoding of an ASN.1 value |
| * -- corresponding to the extension type identified |
| * -- by extnID |
| * } |
| */ |
| int mbedtls_x509_write_extensions(unsigned char **p, unsigned char *start, |
| mbedtls_asn1_named_data *first) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| size_t len = 0; |
| mbedtls_asn1_named_data *cur_ext = first; |
| |
| while (cur_ext != NULL) { |
| MBEDTLS_ASN1_CHK_ADD(len, x509_write_extension(p, start, cur_ext)); |
| cur_ext = cur_ext->next; |
| } |
| |
| return (int) len; |
| } |
| |
| #endif /* MBEDTLS_X509_CREATE_C */ |
