/** * @file x509.c * * @brief Implementation of x509_t. * */ /* * Copyright (C) 2006 Martin Willi * Hochschule fuer Technik Rapperswil * * 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. See . * * 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. */ #include #include #include #include #include "x509.h" #include #include #include #include typedef const char *err_t; /* error message, or NULL for success */ #define chunkcpy(dst, chunk) { memcpy(dst, chunk.ptr, chunk.len); dst += chunk.len;} #define BUF_LEN 512 #define RSA_MIN_OCTETS (512 / 8) #define RSA_MIN_OCTETS_UGH "RSA modulus too small for security: less than 512 bits" #define RSA_MAX_OCTETS (8192 / 8) #define RSA_MAX_OCTETS_UGH "RSA modulus too large: more than 8192 bits" logger_t *logger; typedef enum generalNames_t generalNames_t; /** * Different kinds of generalNames */ enum generalNames_t { GN_OTHER_NAME = 0, GN_RFC822_NAME = 1, GN_DNS_NAME = 2, GN_X400_ADDRESS = 3, GN_DIRECTORY_NAME = 4, GN_EDI_PARTY_NAME = 5, GN_URI = 6, GN_IP_ADDRESS = 7, GN_REGISTERED_ID = 8, }; typedef struct generalName_t generalName_t; /** * A generalName, chainable in a list */ struct generalName_t { generalName_t *next; generalNames_t kind; chunk_t name; }; typedef struct private_x509_t private_x509_t; /** * Private data of a x509_t object. */ struct private_x509_t { /** * Public interface for this certificate. */ x509_t public; time_t installed; u_char authority_flags; chunk_t x509; chunk_t tbsCertificate; u_int version; chunk_t serialNumber; /* signature */ int sigAlg; chunk_t issuer; /* validity */ time_t notBefore; time_t notAfter; chunk_t subject; /* subjectPublicKeyInfo */ auth_method_t subjectPublicKeyAlgorithm; chunk_t subjectPublicKey; rsa_public_key_t *public_key; /* issuerUniqueID */ /* subjectUniqueID */ /* v3 extensions */ /* extension */ /* extension */ /* extnID */ /* critical */ /* extnValue */ bool isCA; bool isOcspSigner; /* ocsp */ chunk_t subjectKeyID; chunk_t authKeyID; chunk_t authKeySerialNumber; chunk_t accessLocation; /* ocsp */ generalName_t *subjectAltName; generalName_t *crlDistributionPoints; /* signatureAlgorithm */ int algorithm; chunk_t signature; }; /** * ASN.1 definition of a basicConstraints extension */ static const asn1Object_t basicConstraintsObjects[] = { { 0, "basicConstraints", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */ { 1, "CA", ASN1_BOOLEAN, ASN1_DEF|ASN1_BODY }, /* 1 */ { 1, "pathLenConstraint", ASN1_INTEGER, ASN1_OPT|ASN1_BODY }, /* 2 */ { 1, "end opt", ASN1_EOC, ASN1_END } /* 3 */ }; #define BASIC_CONSTRAINTS_CA 1 #define BASIC_CONSTRAINTS_ROOF 4 /** * ASN.1 definition of time */ static const asn1Object_t timeObjects[] = { { 0, "utcTime", ASN1_UTCTIME, ASN1_OPT|ASN1_BODY }, /* 0 */ { 0, "end opt", ASN1_EOC, ASN1_END }, /* 1 */ { 0, "generalizeTime",ASN1_GENERALIZEDTIME, ASN1_OPT|ASN1_BODY }, /* 2 */ { 0, "end opt", ASN1_EOC, ASN1_END } /* 3 */ }; #define TIME_UTC 0 #define TIME_GENERALIZED 2 #define TIME_ROOF 4 /** * ASN.1 definition of a keyIdentifier */ static const asn1Object_t keyIdentifierObjects[] = { { 0, "keyIdentifier", ASN1_OCTET_STRING, ASN1_BODY } /* 0 */ }; /** * ASN.1 definition of a authorityKeyIdentifier extension */ static const asn1Object_t authorityKeyIdentifierObjects[] = { { 0, "authorityKeyIdentifier", ASN1_SEQUENCE, ASN1_NONE }, /* 0 */ { 1, "keyIdentifier", ASN1_CONTEXT_S_0, ASN1_OPT|ASN1_OBJ }, /* 1 */ { 1, "end opt", ASN1_EOC, ASN1_END }, /* 2 */ { 1, "authorityCertIssuer", ASN1_CONTEXT_C_1, ASN1_OPT|ASN1_OBJ }, /* 3 */ { 1, "end opt", ASN1_EOC, ASN1_END }, /* 4 */ { 1, "authorityCertSerialNumber",ASN1_CONTEXT_S_2, ASN1_OPT|ASN1_BODY }, /* 5 */ { 1, "end opt", ASN1_EOC, ASN1_END } /* 6 */ }; #define AUTH_KEY_ID_KEY_ID 1 #define AUTH_KEY_ID_CERT_ISSUER 3 #define AUTH_KEY_ID_CERT_SERIAL 5 #define AUTH_KEY_ID_ROOF 7 /** * ASN.1 definition of a authorityInfoAccess extension */ static const asn1Object_t authorityInfoAccessObjects[] = { { 0, "authorityInfoAccess", ASN1_SEQUENCE, ASN1_LOOP }, /* 0 */ { 1, "accessDescription", ASN1_SEQUENCE, ASN1_NONE }, /* 1 */ { 2, "accessMethod", ASN1_OID, ASN1_BODY }, /* 2 */ { 2, "accessLocation", ASN1_EOC, ASN1_RAW }, /* 3 */ { 0, "end loop", ASN1_EOC, ASN1_END } /* 4 */ }; #define AUTH_INFO_ACCESS_METHOD 2 #define AUTH_INFO_ACCESS_LOCATION 3 #define AUTH_INFO_ACCESS_ROOF 5 /** * ASN.1 definition of a extendedKeyUsage extension */ static const asn1Object_t extendedKeyUsageObjects[] = { { 0, "extendedKeyUsage", ASN1_SEQUENCE, ASN1_LOOP }, /* 0 */ { 1, "keyPurposeID", ASN1_OID, ASN1_BODY }, /* 1 */ { 0, "end loop", ASN1_EOC, ASN1_END }, /* 2 */ }; #define EXT_KEY_USAGE_PURPOSE_ID 1 #define EXT_KEY_USAGE_ROOF 3 /** * ASN.1 definition of generalNames */ static const asn1Object_t generalNamesObjects[] = { { 0, "generalNames", ASN1_SEQUENCE, ASN1_LOOP }, /* 0 */ { 1, "generalName", ASN1_EOC, ASN1_RAW }, /* 1 */ { 0, "end loop", ASN1_EOC, ASN1_END } /* 2 */ }; #define GENERAL_NAMES_GN 1 #define GENERAL_NAMES_ROOF 3 /** * ASN.1 definition of generalName */ static const asn1Object_t generalNameObjects[] = { { 0, "otherName", ASN1_CONTEXT_C_0, ASN1_OPT|ASN1_BODY }, /* 0 */ { 0, "end choice", ASN1_EOC, ASN1_END }, /* 1 */ { 0, "rfc822Name", ASN1_CONTEXT_S_1, ASN1_OPT|ASN1_BODY }, /* 2 */ { 0, "end choice", ASN1_EOC, ASN1_END }, /* 3 */ { 0, "dnsName", ASN1_CONTEXT_S_2, ASN1_OPT|ASN1_BODY }, /* 4 */ { 0, "end choice", ASN1_EOC, ASN1_END }, /* 5 */ { 0, "x400Address", ASN1_CONTEXT_S_3, ASN1_OPT|ASN1_BODY }, /* 6 */ { 0, "end choice", ASN1_EOC, ASN1_END }, /* 7 */ { 0, "directoryName", ASN1_CONTEXT_C_4, ASN1_OPT|ASN1_BODY }, /* 8 */ { 0, "end choice", ASN1_EOC, ASN1_END }, /* 9 */ { 0, "ediPartyName", ASN1_CONTEXT_C_5, ASN1_OPT|ASN1_BODY }, /* 10 */ { 0, "end choice", ASN1_EOC, ASN1_END }, /* 11 */ { 0, "URI", ASN1_CONTEXT_S_6, ASN1_OPT|ASN1_BODY }, /* 12 */ { 0, "end choice", ASN1_EOC, ASN1_END }, /* 13 */ { 0, "ipAddress", ASN1_CONTEXT_S_7, ASN1_OPT|ASN1_BODY }, /* 14 */ { 0, "end choice", ASN1_EOC, ASN1_END }, /* 15 */ { 0, "registeredID", ASN1_CONTEXT_S_8, ASN1_OPT|ASN1_BODY }, /* 16 */ { 0, "end choice", ASN1_EOC, ASN1_END } /* 17 */ }; #define GN_OBJ_OTHER_NAME 0 #define GN_OBJ_RFC822_NAME 2 #define GN_OBJ_DNS_NAME 4 #define GN_OBJ_X400_ADDRESS 6 #define GN_OBJ_DIRECTORY_NAME 8 #define GN_OBJ_EDI_PARTY_NAME 10 #define GN_OBJ_URI 12 #define GN_OBJ_IP_ADDRESS 14 #define GN_OBJ_REGISTERED_ID 16 #define GN_OBJ_ROOF 18 /** * ASN.1 definition of otherName */ static const asn1Object_t otherNameObjects[] = { {0, "type-id", ASN1_OID, ASN1_BODY }, /* 0 */ {0, "value", ASN1_CONTEXT_C_0, ASN1_BODY } /* 1 */ }; #define ON_OBJ_ID_TYPE 0 #define ON_OBJ_VALUE 1 #define ON_OBJ_ROOF 2 /** * SN.1 definition of crlDistributionPoints */ static const asn1Object_t crlDistributionPointsObjects[] = { { 0, "crlDistributionPoints", ASN1_SEQUENCE, ASN1_LOOP }, /* 0 */ { 1, "DistributionPoint", ASN1_SEQUENCE, ASN1_NONE }, /* 1 */ { 2, "distributionPoint", ASN1_CONTEXT_C_0, ASN1_OPT|ASN1_LOOP }, /* 2 */ { 3, "fullName", ASN1_CONTEXT_C_0, ASN1_OPT|ASN1_OBJ }, /* 3 */ { 3, "end choice", ASN1_EOC, ASN1_END }, /* 4 */ { 3, "nameRelToCRLIssuer",ASN1_CONTEXT_C_1, ASN1_OPT|ASN1_BODY }, /* 5 */ { 3, "end choice", ASN1_EOC, ASN1_END }, /* 6 */ { 2, "end opt", ASN1_EOC, ASN1_END }, /* 7 */ { 2, "reasons", ASN1_CONTEXT_C_1, ASN1_OPT|ASN1_BODY }, /* 8 */ { 2, "end opt", ASN1_EOC, ASN1_END }, /* 9 */ { 2, "crlIssuer", ASN1_CONTEXT_C_2, ASN1_OPT|ASN1_BODY }, /* 10 */ { 2, "end opt", ASN1_EOC, ASN1_END }, /* 11 */ { 0, "end loop", ASN1_EOC, ASN1_END }, /* 12 */ }; #define CRL_DIST_POINTS_FULLNAME 3 #define CRL_DIST_POINTS_ROOF 13 /** * ASN.1 definition of an X.509v3 x509 */ static const asn1Object_t certObjects[] = { { 0, "x509", ASN1_SEQUENCE, ASN1_OBJ }, /* 0 */ { 1, "tbsCertificate", ASN1_SEQUENCE, ASN1_OBJ }, /* 1 */ { 2, "DEFAULT v1", ASN1_CONTEXT_C_0, ASN1_DEF }, /* 2 */ { 3, "version", ASN1_INTEGER, ASN1_BODY }, /* 3 */ { 2, "serialNumber", ASN1_INTEGER, ASN1_BODY }, /* 4 */ { 2, "signature", ASN1_EOC, ASN1_RAW }, /* 5 */ { 2, "issuer", ASN1_SEQUENCE, ASN1_OBJ }, /* 6 */ { 2, "validity", ASN1_SEQUENCE, ASN1_NONE }, /* 7 */ { 3, "notBefore", ASN1_EOC, ASN1_RAW }, /* 8 */ { 3, "notAfter", ASN1_EOC, ASN1_RAW }, /* 9 */ { 2, "subject", ASN1_SEQUENCE, ASN1_OBJ }, /* 10 */ { 2, "subjectPublicKeyInfo",ASN1_SEQUENCE, ASN1_NONE }, /* 11 */ { 3, "algorithm", ASN1_EOC, ASN1_RAW }, /* 12 */ { 3, "subjectPublicKey", ASN1_BIT_STRING, ASN1_NONE }, /* 13 */ { 4, "RSAPublicKey", ASN1_SEQUENCE, ASN1_RAW }, /* 14 */ { 2, "issuerUniqueID", ASN1_CONTEXT_C_1, ASN1_OPT }, /* 15 */ { 2, "end opt", ASN1_EOC, ASN1_END }, /* 16 */ { 2, "subjectUniqueID", ASN1_CONTEXT_C_2, ASN1_OPT }, /* 17 */ { 2, "end opt", ASN1_EOC, ASN1_END }, /* 18 */ { 2, "optional extensions", ASN1_CONTEXT_C_3, ASN1_OPT }, /* 19 */ { 3, "extensions", ASN1_SEQUENCE, ASN1_LOOP }, /* 20 */ { 4, "extension", ASN1_SEQUENCE, ASN1_NONE }, /* 21 */ { 5, "extnID", ASN1_OID, ASN1_BODY }, /* 22 */ { 5, "critical", ASN1_BOOLEAN, ASN1_DEF|ASN1_BODY }, /* 23 */ { 5, "extnValue", ASN1_OCTET_STRING, ASN1_BODY }, /* 24 */ { 3, "end loop", ASN1_EOC, ASN1_END }, /* 25 */ { 2, "end opt", ASN1_EOC, ASN1_END }, /* 26 */ { 1, "signatureAlgorithm", ASN1_EOC, ASN1_RAW }, /* 27 */ { 1, "signatureValue", ASN1_BIT_STRING, ASN1_BODY } /* 28 */ }; #define X509_OBJ_CERTIFICATE 0 #define X509_OBJ_TBS_CERTIFICATE 1 #define X509_OBJ_VERSION 3 #define X509_OBJ_SERIAL_NUMBER 4 #define X509_OBJ_SIG_ALG 5 #define X509_OBJ_ISSUER 6 #define X509_OBJ_NOT_BEFORE 8 #define X509_OBJ_NOT_AFTER 9 #define X509_OBJ_SUBJECT 10 #define X509_OBJ_SUBJECT_PUBLIC_KEY_ALGORITHM 12 #define X509_OBJ_SUBJECT_PUBLIC_KEY 13 #define X509_OBJ_RSA_PUBLIC_KEY 14 #define X509_OBJ_EXTN_ID 22 #define X509_OBJ_CRITICAL 23 #define X509_OBJ_EXTN_VALUE 24 #define X509_OBJ_ALGORITHM 27 #define X509_OBJ_SIGNATURE 28 #define X509_OBJ_ROOF 29 /** * X.501 acronyms for well known object identifiers (OIDs) */ static u_char oid_ND[] = { 0x02, 0x82, 0x06, 0x01, 0x0A, 0x07, 0x14 }; static u_char oid_UID[] = { 0x09, 0x92, 0x26, 0x89, 0x93, 0xF2, 0x2C, 0x64, 0x01, 0x01 }; static u_char oid_DC[] = { 0x09, 0x92, 0x26, 0x89, 0x93, 0xF2, 0x2C, 0x64, 0x01, 0x19 }; static u_char oid_CN[] = { 0x55, 0x04, 0x03 }; static u_char oid_S[] = { 0x55, 0x04, 0x04 }; static u_char oid_SN[] = { 0x55, 0x04, 0x05 }; static u_char oid_C[] = { 0x55, 0x04, 0x06 }; static u_char oid_L[] = { 0x55, 0x04, 0x07 }; static u_char oid_ST[] = { 0x55, 0x04, 0x08 }; static u_char oid_O[] = { 0x55, 0x04, 0x0A }; static u_char oid_OU[] = { 0x55, 0x04, 0x0B }; static u_char oid_T[] = { 0x55, 0x04, 0x0C }; static u_char oid_D[] = { 0x55, 0x04, 0x0D }; static u_char oid_N[] = { 0x55, 0x04, 0x29 }; static u_char oid_G[] = { 0x55, 0x04, 0x2A }; static u_char oid_I[] = { 0x55, 0x04, 0x2B }; static u_char oid_ID[] = { 0x55, 0x04, 0x2D }; static u_char oid_E[] = { 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x09, 0x01 }; static u_char oid_UN[] = { 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x09, 0x02 }; static u_char oid_TCGID[] = { 0x2B, 0x06, 0x01, 0x04, 0x01, 0x89, 0x31, 0x01, 0x01, 0x02, 0x02, 0x4B }; /** * coding of X.501 distinguished name */ typedef struct { const u_char *name; chunk_t oid; u_char type; } x501rdn_t; static const x501rdn_t x501rdns[] = { {"ND", {oid_ND, 7}, ASN1_PRINTABLESTRING}, {"UID", {oid_UID, 10}, ASN1_PRINTABLESTRING}, {"DC", {oid_DC, 10}, ASN1_PRINTABLESTRING}, {"CN", {oid_CN, 3}, ASN1_PRINTABLESTRING}, {"S", {oid_S, 3}, ASN1_PRINTABLESTRING}, {"SN", {oid_SN, 3}, ASN1_PRINTABLESTRING}, {"serialNumber", {oid_SN, 3}, ASN1_PRINTABLESTRING}, {"C", {oid_C, 3}, ASN1_PRINTABLESTRING}, {"L", {oid_L, 3}, ASN1_PRINTABLESTRING}, {"ST", {oid_ST, 3}, ASN1_PRINTABLESTRING}, {"O", {oid_O, 3}, ASN1_PRINTABLESTRING}, {"OU", {oid_OU, 3}, ASN1_PRINTABLESTRING}, {"T", {oid_T, 3}, ASN1_PRINTABLESTRING}, {"D", {oid_D, 3}, ASN1_PRINTABLESTRING}, {"N", {oid_N, 3}, ASN1_PRINTABLESTRING}, {"G", {oid_G, 3}, ASN1_PRINTABLESTRING}, {"I", {oid_I, 3}, ASN1_PRINTABLESTRING}, {"ID", {oid_ID, 3}, ASN1_PRINTABLESTRING}, {"E", {oid_E, 9}, ASN1_IA5STRING}, {"Email", {oid_E, 9}, ASN1_IA5STRING}, {"emailAddress", {oid_E, 9}, ASN1_IA5STRING}, {"UN", {oid_UN, 9}, ASN1_IA5STRING}, {"unstructuredName",{oid_UN, 9}, ASN1_IA5STRING}, {"TCGID", {oid_TCGID, 12}, ASN1_PRINTABLESTRING} }; #define X501_RDN_ROOF 24 static u_char ASN1_subjectAltName_oid_str[] = { 0x06, 0x03, 0x55, 0x1D, 0x11 }; static const chunk_t ASN1_subjectAltName_oid = chunk_from_buf(ASN1_subjectAltName_oid_str); static void update_chunk(chunk_t *ch, int n) { n = (n > -1 && n < (int)ch->len)? n : (int)ch->len-1; ch->ptr += n; ch->len -= n; } /** * Prints a binary string in hexadecimal form */ void hex_str(chunk_t bin, chunk_t *str) { u_int i; update_chunk(str, snprintf(str->ptr,str->len,"0x")); for (i=0; i < bin.len; i++) { update_chunk(str, snprintf(str->ptr,str->len,"%02X",*bin.ptr++)); } } /** * Pointer is set to the first RDN in a DN */ static err_t init_rdn(chunk_t dn, chunk_t *rdn, chunk_t *attribute, bool *next) { *rdn = CHUNK_INITIALIZER; *attribute = CHUNK_INITIALIZER; /* a DN is a SEQUENCE OF RDNs */ if (*dn.ptr != ASN1_SEQUENCE) { return "DN is not a SEQUENCE"; } rdn->len = asn1_length(&dn); if (rdn->len == ASN1_INVALID_LENGTH) return "Invalid RDN length"; rdn->ptr = dn.ptr; /* are there any RDNs ? */ *next = rdn->len > 0; return NULL; } /** * Fetches the next RDN in a DN */ static err_t get_next_rdn(chunk_t *rdn, chunk_t * attribute, chunk_t *oid, chunk_t *value, asn1_t *type, bool *next) { chunk_t body; /* initialize return values */ *oid = CHUNK_INITIALIZER; *value = CHUNK_INITIALIZER; /* if all attributes have been parsed, get next rdn */ if (attribute->len <= 0) { /* an RDN is a SET OF attributeTypeAndValue */ if (*rdn->ptr != ASN1_SET) { return "RDN is not a SET"; } attribute->len = asn1_length(rdn); if (attribute->len == ASN1_INVALID_LENGTH) { return "Invalid attribute length"; } attribute->ptr = rdn->ptr; /* advance to start of next RDN */ rdn->ptr += attribute->len; rdn->len -= attribute->len; } /* an attributeTypeAndValue is a SEQUENCE */ if (*attribute->ptr != ASN1_SEQUENCE) { return "attributeTypeAndValue is not a SEQUENCE"; } /* extract the attribute body */ body.len = asn1_length(attribute); if (body.len == ASN1_INVALID_LENGTH) { return "Invalid attribute body length"; } body.ptr = attribute->ptr; /* advance to start of next attribute */ attribute->ptr += body.len; attribute->len -= body.len; /* attribute type is an OID */ if (*body.ptr != ASN1_OID) { return "attributeType is not an OID"; } /* extract OID */ oid->len = asn1_length(&body); if (oid->len == ASN1_INVALID_LENGTH) { return "Invalid attribute OID length"; } oid->ptr = body.ptr; /* advance to the attribute value */ body.ptr += oid->len; body.len -= oid->len; /* extract string type */ *type = *body.ptr; /* extract string value */ value->len = asn1_length(&body); if (value->len == ASN1_INVALID_LENGTH) { return "Invalid attribute string length"; } value->ptr = body.ptr; /* are there any RDNs left? */ *next = rdn->len > 0 || attribute->len > 0; return NULL; } /** * Parses an ASN.1 distinguished name int its OID/value pairs */ static err_t dn_parse(chunk_t dn, chunk_t *str) { chunk_t rdn, oid, attribute, value; asn1_t type; int oid_code; bool next; bool first = TRUE; err_t ugh = init_rdn(dn, &rdn, &attribute, &next); if (ugh != NULL) {/* a parsing error has occured */ return ugh; } while (next) { ugh = get_next_rdn(&rdn, &attribute, &oid, &value, &type, &next); if (ugh != NULL) { /* a parsing error has occured */ return ugh; } if (first) { /* first OID/value pair */ first = FALSE; } else { /* separate OID/value pair by a comma */ update_chunk(str, snprintf(str->ptr,str->len,", ")); } /* print OID */ oid_code = known_oid(oid); if (oid_code == OID_UNKNOWN) { /* OID not found in list */ hex_str(oid, str); } else { update_chunk(str, snprintf(str->ptr,str->len,"%s", oid_names[oid_code].name)); } /* print value */ update_chunk(str, snprintf(str->ptr,str->len,"=%.*s", (int)value.len,value.ptr)); } return NULL; } /** * Count the number of wildcard RDNs in a distinguished name */ int dn_count_wildcards(chunk_t dn) { chunk_t rdn, attribute, oid, value; asn1_t type; bool next; int wildcards = 0; err_t ugh = init_rdn(dn, &rdn, &attribute, &next); if (ugh != NULL) { /* a parsing error has occured */ return -1; } while (next) { ugh = get_next_rdn(&rdn, &attribute, &oid, &value, &type, &next); if (ugh != NULL) {/* a parsing error has occured */ return -1; } if (value.len == 1 && *value.ptr == '*') { wildcards++; /* we have found a wildcard RDN */ } } return wildcards; } /** * Converts a binary DER-encoded ASN.1 distinguished name * into LDAP-style human-readable ASCII format */ int dntoa(char *dst, size_t dstlen, chunk_t dn) { err_t ugh = NULL; chunk_t str; str.ptr = dst; str.len = dstlen; ugh = dn_parse(dn, &str); if (ugh != NULL) /* error, print DN as hex string */ { logger->log(logger, ERROR|LEVEL1, "error in DN parsing: %s", ugh); str.ptr = dst; str.len = dstlen; hex_str(dn, &str); } return (int)(dstlen - str.len); } /** * Same as dntoa but prints a special string for a null dn */ int dntoa_or_null(char *dst, size_t dstlen, chunk_t dn, const char* null_dn) { if (dn.ptr == NULL) { return snprintf(dst, dstlen, "%s", null_dn); } else { return dntoa(dst, dstlen, dn); } } /** * Converts an LDAP-style human-readable ASCII-encoded * ASN.1 distinguished name into binary DER-encoded format */ err_t atodn(char *src, chunk_t *dn) { /* finite state machine for atodn */ typedef enum { SEARCH_OID = 0, READ_OID = 1, SEARCH_NAME = 2, READ_NAME = 3, UNKNOWN_OID = 4 } state_t; u_char oid_len_buf[3]; u_char name_len_buf[3]; u_char rdn_seq_len_buf[3]; u_char rdn_set_len_buf[3]; u_char dn_seq_len_buf[3]; chunk_t asn1_oid_len = { oid_len_buf, 0 }; chunk_t asn1_name_len = { name_len_buf, 0 }; chunk_t asn1_rdn_seq_len = { rdn_seq_len_buf, 0 }; chunk_t asn1_rdn_set_len = { rdn_set_len_buf, 0 }; chunk_t asn1_dn_seq_len = { dn_seq_len_buf, 0 }; chunk_t oid = CHUNK_INITIALIZER; chunk_t name = CHUNK_INITIALIZER; int whitespace = 0; int rdn_seq_len = 0; int rdn_set_len = 0; int dn_seq_len = 0; int pos = 0; err_t ugh = NULL; u_char *dn_ptr = dn->ptr + 4; state_t state = SEARCH_OID; do { switch (state) { case SEARCH_OID: if (*src != ' ' && *src != '/' && *src != ',') { oid.ptr = src; oid.len = 1; state = READ_OID; } break; case READ_OID: if (*src != ' ' && *src != '=') oid.len++; else { for (pos = 0; pos < X501_RDN_ROOF; pos++) { if (strlen(x501rdns[pos].name) == oid.len && strncasecmp(x501rdns[pos].name, oid.ptr, oid.len) == 0) { break; /* found a valid OID */ } } if (pos == X501_RDN_ROOF) { ugh = "unknown OID in distinguished name"; state = UNKNOWN_OID; break; } code_asn1_length(x501rdns[pos].oid.len, &asn1_oid_len); /* reset oid and change state */ oid = CHUNK_INITIALIZER; state = SEARCH_NAME; } break; case SEARCH_NAME: if (*src != ' ' && *src != '=') { name.ptr = src; name.len = 1; whitespace = 0; state = READ_NAME; } break; case READ_NAME: if (*src != ',' && *src != '/' && *src != '\0') { name.len++; if (*src == ' ') whitespace++; else whitespace = 0; } else { name.len -= whitespace; code_asn1_length(name.len, &asn1_name_len); /* compute the length of the relative distinguished name sequence */ rdn_seq_len = 1 + asn1_oid_len.len + x501rdns[pos].oid.len + 1 + asn1_name_len.len + name.len; code_asn1_length(rdn_seq_len, &asn1_rdn_seq_len); /* compute the length of the relative distinguished name set */ rdn_set_len = 1 + asn1_rdn_seq_len.len + rdn_seq_len; code_asn1_length(rdn_set_len, &asn1_rdn_set_len); /* encode the relative distinguished name */ *dn_ptr++ = ASN1_SET; chunkcpy(dn_ptr, asn1_rdn_set_len); *dn_ptr++ = ASN1_SEQUENCE; chunkcpy(dn_ptr, asn1_rdn_seq_len); *dn_ptr++ = ASN1_OID; chunkcpy(dn_ptr, asn1_oid_len); chunkcpy(dn_ptr, x501rdns[pos].oid); /* encode the ASN.1 character string type of the name */ *dn_ptr++ = (x501rdns[pos].type == ASN1_PRINTABLESTRING && !is_printablestring(name))? ASN1_T61STRING : x501rdns[pos].type; chunkcpy(dn_ptr, asn1_name_len); chunkcpy(dn_ptr, name); /* accumulate the length of the distinguished name sequence */ dn_seq_len += 1 + asn1_rdn_set_len.len + rdn_set_len; /* reset name and change state */ name = CHUNK_INITIALIZER; state = SEARCH_OID; } break; case UNKNOWN_OID: break; } } while (*src++ != '\0'); /* complete the distinguished name sequence */ code_asn1_length(dn_seq_len, &asn1_dn_seq_len); dn->ptr += 3 - asn1_dn_seq_len.len; dn->len = 1 + asn1_dn_seq_len.len + dn_seq_len; dn_ptr = dn->ptr; *dn_ptr++ = ASN1_SEQUENCE; chunkcpy(dn_ptr, asn1_dn_seq_len); return ugh; } /** * compare two distinguished names by * comparing the individual RDNs */ bool same_dn(chunk_t a, chunk_t b) { chunk_t rdn_a, rdn_b, attribute_a, attribute_b; chunk_t oid_a, oid_b, value_a, value_b; asn1_t type_a, type_b; bool next_a, next_b; /* same lengths for the DNs */ if (a.len != b.len) { return FALSE; } /* try a binary comparison first */ if (memcmp(a.ptr, b.ptr, b.len) == 0) { return TRUE; } /* initialize DN parsing */ if (init_rdn(a, &rdn_a, &attribute_a, &next_a) != NULL || init_rdn(b, &rdn_b, &attribute_b, &next_b) != NULL) { return FALSE; } /* fetch next RDN pair */ while (next_a && next_b) { /* parse next RDNs and check for errors */ if (get_next_rdn(&rdn_a, &attribute_a, &oid_a, &value_a, &type_a, &next_a) != NULL || get_next_rdn(&rdn_b, &attribute_b, &oid_b, &value_b, &type_b, &next_b) != NULL) { return FALSE; } /* OIDs must agree */ if (oid_a.len != oid_b.len || memcmp(oid_a.ptr, oid_b.ptr, oid_b.len) != 0) { return FALSE; } /* same lengths for values */ if (value_a.len != value_b.len) { return FALSE; } /* printableStrings and email RDNs require uppercase comparison */ if (type_a == type_b && (type_a == ASN1_PRINTABLESTRING || (type_a == ASN1_IA5STRING && known_oid(oid_a) == OID_PKCS9_EMAIL))) { if (strncasecmp(value_a.ptr, value_b.ptr, value_b.len) != 0) { return FALSE; } } else { if (strncmp(value_a.ptr, value_b.ptr, value_b.len) != 0) { return FALSE; } } } /* both DNs must have same number of RDNs */ if (next_a || next_b) return FALSE; /* the two DNs are equal! */ return TRUE; } /** * compare two distinguished names by comparing the individual RDNs. * A single'*' character designates a wildcard RDN in DN b. */ bool match_dn(chunk_t a, chunk_t b, int *wildcards) { chunk_t rdn_a, rdn_b, attribute_a, attribute_b; chunk_t oid_a, oid_b, value_a, value_b; asn1_t type_a, type_b; bool next_a, next_b; /* initialize wildcard counter */ *wildcards = 0; /* initialize DN parsing */ if (init_rdn(a, &rdn_a, &attribute_a, &next_a) != NULL || init_rdn(b, &rdn_b, &attribute_b, &next_b) != NULL) { return FALSE; } /* fetch next RDN pair */ while (next_a && next_b) { /* parse next RDNs and check for errors */ if (get_next_rdn(&rdn_a, &attribute_a, &oid_a, &value_a, &type_a, &next_a) != NULL || get_next_rdn(&rdn_b, &attribute_b, &oid_b, &value_b, &type_b, &next_b) != NULL) { return FALSE; } /* OIDs must agree */ if (oid_a.len != oid_b.len || memcmp(oid_a.ptr, oid_b.ptr, oid_b.len) != 0) { return FALSE; } /* does rdn_b contain a wildcard? */ if (value_b.len == 1 && *value_b.ptr == '*') { (*wildcards)++; continue; } /* same lengths for values */ if (value_a.len != value_b.len) { return FALSE; } /* printableStrings and email RDNs require uppercase comparison */ if (type_a == type_b && (type_a == ASN1_PRINTABLESTRING || (type_a == ASN1_IA5STRING && known_oid(oid_a) == OID_PKCS9_EMAIL))) { if (strncasecmp(value_a.ptr, value_b.ptr, value_b.len) != 0) { return FALSE; } } else { if (strncmp(value_a.ptr, value_b.ptr, value_b.len) != 0) { return FALSE; } } } /* both DNs must have same number of RDNs */ if (next_a || next_b) { return FALSE; } /* the two DNs match! */ return TRUE; } /** * compare two X.509 x509s by comparing their signatures */ static bool equals(private_x509_t *this, private_x509_t *other) { return chunk_equals(this->signature, other->signature); } /** * encode a linked list of subjectAltNames */ chunk_t build_subjectAltNames(generalName_t *subjectAltNames) { u_char *pos; chunk_t names; size_t len = 0; generalName_t *gn = subjectAltNames; /* compute the total size of the ASN.1 attributes object */ while (gn != NULL) { len += gn->name.len; gn = gn->next; } pos = build_asn1_object(&names, ASN1_SEQUENCE, len); gn = subjectAltNames; while (gn != NULL) { chunkcpy(pos, gn->name); gn = gn->next; } return asn1_wrap(ASN1_SEQUENCE, "cm", ASN1_subjectAltName_oid, asn1_wrap(ASN1_OCTET_STRING, "m", names) ); } /** * free the dynamic memory used to store generalNames */ void free_generalNames(generalName_t* gn, bool free_name) { while (gn != NULL) { generalName_t *gn_top = gn; if (free_name) { free(gn->name.ptr); } gn = gn->next; free(gn_top); } } /** * extracts the basicConstraints extension */ static bool parse_basicConstraints(chunk_t blob, int level0) { asn1_ctx_t ctx; chunk_t object; u_int level; int objectID = 0; bool isCA = FALSE; asn1_init(&ctx, blob, level0, FALSE); while (objectID < BASIC_CONSTRAINTS_ROOF) { if (!extract_object(basicConstraintsObjects, &objectID, &object,&level, &ctx)) { break; } if (objectID == BASIC_CONSTRAINTS_CA) { isCA = object.len && *object.ptr; logger->log(logger, RAW|LEVEL1, " %s", isCA ? "TRUE" : "FALSE"); } objectID++; } return isCA; } /** * extracts an otherName */ static bool parse_otherName(chunk_t blob, int level0) { asn1_ctx_t ctx; chunk_t object; int objectID = 0; u_int level; int oid = OID_UNKNOWN; asn1_init(&ctx, blob, level0, FALSE); while (objectID < ON_OBJ_ROOF) { if (!extract_object(otherNameObjects, &objectID, &object, &level, &ctx)) return FALSE; switch (objectID) { case ON_OBJ_ID_TYPE: oid = known_oid(object); break; case ON_OBJ_VALUE: if (oid == OID_XMPP_ADDR) { if (!parse_asn1_simple_object(&object, ASN1_UTF8STRING, level + 1, "xmppAddr")) { return FALSE; } } break; default: break; } objectID++; } return TRUE; } /** * extracts a generalName */ static generalName_t* parse_generalName(chunk_t blob, int level0) { asn1_ctx_t ctx; chunk_t object; int objectID = 0; u_int level; asn1_init(&ctx, blob, level0, FALSE); while (objectID < GN_OBJ_ROOF) { bool valid_gn = FALSE; if (!extract_object(generalNameObjects, &objectID, &object, &level, &ctx)) return NULL; switch (objectID) { case GN_OBJ_RFC822_NAME: case GN_OBJ_DNS_NAME: case GN_OBJ_URI: logger->log(logger, RAW|LEVEL1, " '%.*s'", (int)object.len, object.ptr); valid_gn = TRUE; break; case GN_OBJ_DIRECTORY_NAME: valid_gn = TRUE; break; case GN_OBJ_IP_ADDRESS: logger->log(logger, RAW|LEVEL1, " '%d.%d.%d.%d'", *object.ptr, *(object.ptr+1), *(object.ptr+2), *(object.ptr+3)); valid_gn = TRUE; break; case GN_OBJ_OTHER_NAME: if (!parse_otherName(object, level + 1)) return NULL; break; case GN_OBJ_X400_ADDRESS: case GN_OBJ_EDI_PARTY_NAME: case GN_OBJ_REGISTERED_ID: break; default: break; } if (valid_gn) { generalName_t *gn = malloc_thing(generalName_t); gn->kind = (objectID - GN_OBJ_OTHER_NAME) / 2; gn->name = object; gn->next = NULL; return gn; } objectID++; } return NULL; } /** * extracts one or several GNs and puts them into a chained list */ static generalName_t* parse_generalNames(chunk_t blob, int level0, bool implicit) { asn1_ctx_t ctx; chunk_t object; u_int level; int objectID = 0; generalName_t *top_gn = NULL; asn1_init(&ctx, blob, level0, implicit); while (objectID < GENERAL_NAMES_ROOF) { if (!extract_object(generalNamesObjects, &objectID, &object, &level, &ctx)) return NULL; if (objectID == GENERAL_NAMES_GN) { generalName_t *gn = parse_generalName(object, level+1); if (gn != NULL) { gn->next = top_gn; top_gn = gn; } } objectID++; } return top_gn; } /** * returns a directoryName */ chunk_t get_directoryName(chunk_t blob, int level, bool implicit) { chunk_t name = CHUNK_INITIALIZER; generalName_t * gn = parse_generalNames(blob, level, implicit); if (gn != NULL && gn->kind == GN_DIRECTORY_NAME) { name= gn->name; } free_generalNames(gn, FALSE); return name; } /** * extracts and converts a UTCTIME or GENERALIZEDTIME object */ time_t parse_time(chunk_t blob, int level0) { asn1_ctx_t ctx; chunk_t object; u_int level; int objectID = 0; asn1_init(&ctx, blob, level0, FALSE); while (objectID < TIME_ROOF) { if (!extract_object(timeObjects, &objectID, &object, &level, &ctx)) return 0; if (objectID == TIME_UTC || objectID == TIME_GENERALIZED) { return asn1totime(&object, (objectID == TIME_UTC) ? ASN1_UTCTIME : ASN1_GENERALIZEDTIME); } objectID++; } return 0; } /** * extracts a keyIdentifier */ static chunk_t parse_keyIdentifier(chunk_t blob, int level0, bool implicit) { asn1_ctx_t ctx; chunk_t object; u_int level; int objectID = 0; asn1_init(&ctx, blob, level0, implicit); extract_object(keyIdentifierObjects, &objectID, &object, &level, &ctx); return object; } /** * extracts an authoritykeyIdentifier */ void parse_authorityKeyIdentifier(chunk_t blob, int level0 , chunk_t *authKeyID, chunk_t *authKeySerialNumber) { asn1_ctx_t ctx; chunk_t object; u_int level; int objectID = 0; asn1_init(&ctx, blob, level0, FALSE); while (objectID < AUTH_KEY_ID_ROOF) { if (!extract_object(authorityKeyIdentifierObjects, &objectID, &object, &level, &ctx)) { return; } switch (objectID) { case AUTH_KEY_ID_KEY_ID: *authKeyID = parse_keyIdentifier(object, level+1, TRUE); break; case AUTH_KEY_ID_CERT_ISSUER: { generalName_t *gn = parse_generalNames(object, level+1, TRUE); free_generalNames(gn, FALSE); break; } case AUTH_KEY_ID_CERT_SERIAL: *authKeySerialNumber = object; break; default: break; } objectID++; } } /** * extracts an authorityInfoAcess location */ static void parse_authorityInfoAccess(chunk_t blob, int level0, chunk_t *accessLocation) { asn1_ctx_t ctx; chunk_t object; u_int level; int objectID = 0; u_int accessMethod = OID_UNKNOWN; asn1_init(&ctx, blob, level0, FALSE); while (objectID < AUTH_INFO_ACCESS_ROOF) { if (!extract_object(authorityInfoAccessObjects, &objectID, &object, &level, &ctx)) { return; } switch (objectID) { case AUTH_INFO_ACCESS_METHOD: accessMethod = known_oid(object); break; case AUTH_INFO_ACCESS_LOCATION: { switch (accessMethod) { case OID_OCSP: if (*object.ptr == ASN1_CONTEXT_S_6) { if (asn1_length(&object) == ASN1_INVALID_LENGTH) { return; } logger->log(logger, RAW|LEVEL1, " '%.*s'",(int)object.len, object.ptr); /* only HTTP(S) URIs accepted */ if (strncasecmp(object.ptr, "http", 4) == 0) { *accessLocation = object; return; } } logger->log(logger, ERROR|LEVEL2, "ignoring OCSP InfoAccessLocation with unkown protocol"); break; default: /* unkown accessMethod, ignoring */ break; } break; } default: break; } objectID++; } } /** * extracts extendedKeyUsage OIDs */ static bool parse_extendedKeyUsage(chunk_t blob, int level0) { asn1_ctx_t ctx; chunk_t object; u_int level; int objectID = 0; asn1_init(&ctx, blob, level0, FALSE); while (objectID < EXT_KEY_USAGE_ROOF) { if (!extract_object(extendedKeyUsageObjects, &objectID, &object, &level, &ctx)) { return FALSE; } if (objectID == EXT_KEY_USAGE_PURPOSE_ID && known_oid(object) == OID_OCSP_SIGNING) { return TRUE; } objectID++; } return FALSE; } /** * extracts one or several crlDistributionPoints and puts them into * a chained list */ static generalName_t* parse_crlDistributionPoints(chunk_t blob, int level0) { asn1_ctx_t ctx; chunk_t object; u_int level; int objectID = 0; generalName_t *top_gn = NULL; /* top of the chained list */ generalName_t **tail_gn = &top_gn; /* tail of the chained list */ asn1_init(&ctx, blob, level0, FALSE); while (objectID < CRL_DIST_POINTS_ROOF) { if (!extract_object(crlDistributionPointsObjects, &objectID, &object, &level, &ctx)) { return NULL; } if (objectID == CRL_DIST_POINTS_FULLNAME) { generalName_t *gn = parse_generalNames(object, level+1, TRUE); /* append extracted generalNames to existing chained list */ *tail_gn = gn; /* find new tail of the chained list */ while (gn != NULL) { tail_gn = &gn->next; gn = gn->next; } } objectID++; } return top_gn; } /** * Parses an X.509v3 x509 */ bool parse_x509cert(chunk_t blob, u_int level0, private_x509_t *cert) { u_char buf[BUF_LEN]; asn1_ctx_t ctx; bool critical; chunk_t object; u_int level; u_int extn_oid = OID_UNKNOWN; int objectID = 0; asn1_init(&ctx, blob, level0, FALSE); while (objectID < X509_OBJ_ROOF) { if (!extract_object(certObjects, &objectID, &object, &level, &ctx)) { return FALSE; } /* those objects which will parsed further need the next higher level */ level++; switch (objectID) { case X509_OBJ_CERTIFICATE: cert->x509 = object; break; case X509_OBJ_TBS_CERTIFICATE: cert->tbsCertificate = object; break; case X509_OBJ_VERSION: cert->version = (object.len) ? (1+(u_int)*object.ptr) : 1; logger->log(logger, RAW|LEVEL1, " v%d", cert->version); break; case X509_OBJ_SERIAL_NUMBER: cert->serialNumber = object; break; case X509_OBJ_SIG_ALG: cert->sigAlg = parse_algorithmIdentifier(object, level, NULL); break; case X509_OBJ_ISSUER: cert->issuer = object; dntoa(buf, BUF_LEN, object); logger->log(logger, RAW|LEVEL1, " '%s'", buf); break; case X509_OBJ_NOT_BEFORE: cert->notBefore = parse_time(object, level); break; case X509_OBJ_NOT_AFTER: cert->notAfter = parse_time(object, level); break; case X509_OBJ_SUBJECT: cert->subject = object; dntoa(buf, BUF_LEN, object); logger->log(logger, RAW|LEVEL1, " '%s'", buf); break; case X509_OBJ_SUBJECT_PUBLIC_KEY_ALGORITHM: if (parse_algorithmIdentifier(object, level, NULL) == OID_RSA_ENCRYPTION) { cert->subjectPublicKeyAlgorithm = RSA_DIGITAL_SIGNATURE; } else { logger->log(logger, ERROR|LEVEL1, " unsupported public key algorithm"); return FALSE; } break; case X509_OBJ_SUBJECT_PUBLIC_KEY: if (ctx.blobs[4].len > 0 && *ctx.blobs[4].ptr == 0x00) { /* skip initial bit string octet defining 0 unused bits */ ctx.blobs[4].ptr++; ctx.blobs[4].len--; } else { logger->log(logger, ERROR|LEVEL1, " invalid RSA public key format"); return FALSE; } break; case X509_OBJ_RSA_PUBLIC_KEY: cert->subjectPublicKey = object; break; case X509_OBJ_EXTN_ID: extn_oid = known_oid(object); break; case X509_OBJ_CRITICAL: critical = object.len && *object.ptr; logger->log(logger, ERROR|LEVEL1, " %s", critical ? "TRUE" : "FALSE"); break; case X509_OBJ_EXTN_VALUE: { switch (extn_oid) { case OID_SUBJECT_KEY_ID: cert->subjectKeyID = parse_keyIdentifier(object, level, FALSE); break; case OID_SUBJECT_ALT_NAME: cert->subjectAltName = parse_generalNames(object, level, FALSE); break; case OID_BASIC_CONSTRAINTS: cert->isCA = parse_basicConstraints(object, level); break; case OID_CRL_DISTRIBUTION_POINTS: cert->crlDistributionPoints = parse_crlDistributionPoints(object, level); break; case OID_AUTHORITY_KEY_ID: parse_authorityKeyIdentifier(object, level , &cert->authKeyID, &cert->authKeySerialNumber); break; case OID_AUTHORITY_INFO_ACCESS: parse_authorityInfoAccess(object, level, &cert->accessLocation); break; case OID_EXTENDED_KEY_USAGE: cert->isOcspSigner = parse_extendedKeyUsage(object, level); break; case OID_NS_REVOCATION_URL: case OID_NS_CA_REVOCATION_URL: case OID_NS_CA_POLICY_URL: case OID_NS_COMMENT: if (!parse_asn1_simple_object(&object, ASN1_IA5STRING , level, oid_names[extn_oid].name)) { return FALSE; } break; default: break; } break; } case X509_OBJ_ALGORITHM: cert->algorithm = parse_algorithmIdentifier(object, level, NULL); break; case X509_OBJ_SIGNATURE: cert->signature = object; break; default: break; } objectID++; } time(&cert->installed); return TRUE; } /** * verify the validity of a x509 by * checking the notBefore and notAfter dates */ err_t check_validity(const private_x509_t *cert, time_t *until) { time_t current_time; time(¤t_time); if (cert->notAfter < *until) { *until = cert->notAfter; } if (current_time < cert->notBefore) { return "x509 is not valid yet"; } if (current_time > cert->notAfter) { return "x509 has expired"; } else { return NULL; } } static rsa_public_key_t *get_public_key(private_x509_t *this) { return this->public_key->clone(this->public_key);; } /** * destroy */ static void destroy(private_x509_t *this) { free_generalNames(this->subjectAltName, FALSE); free_generalNames(this->crlDistributionPoints, FALSE); if (this->public_key) { this->public_key->destroy(this->public_key); } free(this); } /* * Described in header. */ x509_t *x509_create_from_chunk(chunk_t chunk) { private_x509_t *this = malloc_thing(private_x509_t); /* public functions */ this->public.equals = (bool (*) (x509_t*,x509_t*))equals; this->public.destroy = (void (*) (x509_t*))destroy; this->public.get_public_key = (rsa_public_key_t* (*) (x509_t*))get_public_key; /* initialize */ this->subjectPublicKey = CHUNK_INITIALIZER; this->public_key = NULL; this->subjectAltName = NULL; this->crlDistributionPoints = NULL; logger = logger_manager->get_logger(logger_manager, ASN1); if (!parse_x509cert(chunk, 0, this)) { destroy(this); return NULL; } this->public_key = rsa_public_key_create_from_chunk(this->subjectPublicKey); if (this->public_key == NULL) { destroy(this); return NULL; } return &this->public; } /* * Described in header. */ x509_t *x509_create_from_file(char *filename) { struct stat stb; FILE *file; char *buffer; chunk_t chunk; if (stat(filename, &stb) == -1) { return NULL; } buffer = alloca(stb.st_size); file = fopen(filename, "r"); if (file == NULL) { return NULL; } if (fread(buffer, stb.st_size, 1, file) == -1) { fclose(file); return NULL; } fclose(file); chunk.ptr = buffer; chunk.len = stb.st_size; return x509_create_from_chunk(chunk); }