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mbedtls_stubs.c
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mbedtls_stubs.c
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#include <ctype.h>
#include <string.h>
#include <stdio.h>
#ifdef _WIN32
#include <windows.h>
#include <wincrypt.h>
#endif
#ifdef __APPLE__
#include <Security/Security.h>
#endif
#include <caml/mlvalues.h>
#include <caml/alloc.h>
#include <caml/memory.h>
#include <caml/fail.h>
#include <caml/callback.h>
#include <caml/custom.h>
#include "mbedtls/debug.h"
#include "mbedtls/error.h"
#include "mbedtls/config.h"
#include "mbedtls/ssl.h"
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/certs.h"
#include "mbedtls/oid.h"
#define PVoid_val(v) (*((void**) Data_custom_val(v)))
void debug(void* ctx, int debug_level, const char* file_name, int line, const char* message) {
printf("%s:%i: %s", file_name, line, message);
}
#define Val_none Val_int(0)
static value Val_some(value v) {
CAMLparam1(v);
CAMLlocal1(some);
some = caml_alloc(1, 0);
Store_field(some, 0, v);
CAMLreturn(some);
}
CAMLprim value ml_mbedtls_strerror(value code) {
CAMLparam1(code);
CAMLlocal1(r);
char buf[128];
mbedtls_strerror(Int_val(code), buf, sizeof(buf));
r = caml_copy_string(buf);
CAMLreturn(r);
}
// CtrDrbg
#define CtrDrbg_val(v) (*((mbedtls_ctr_drbg_context**) Data_custom_val(v)))
static void ml_mbedtls_ctr_drbg_finalize(value v) {
mbedtls_ctr_drbg_context* ctr_drbg = CtrDrbg_val(v);
if (ctr_drbg != NULL) {
mbedtls_ctr_drbg_free(ctr_drbg);
}
}
static struct custom_operations ctr_drbg_ops = {
.identifier = "ml_ctr_drbg",
.finalize = ml_mbedtls_ctr_drbg_finalize,
.compare = custom_compare_default,
.hash = custom_hash_default,
.serialize = custom_serialize_default,
.deserialize = custom_deserialize_default,
};
CAMLprim value ml_mbedtls_ctr_drbg_init(void) {
CAMLparam0();
CAMLlocal1(obj);
obj = caml_alloc_custom(&ctr_drbg_ops, sizeof(mbedtls_ctr_drbg_context*), 0, 1);
mbedtls_ctr_drbg_context* ctr_drbg = malloc(sizeof(mbedtls_ctr_drbg_context));
mbedtls_ctr_drbg_init(ctr_drbg);
CtrDrbg_val(obj) = ctr_drbg;
CAMLreturn(obj);
}
CAMLprim value ml_mbedtls_ctr_drbg_random(value p_rng, value output, value output_len) {
CAMLparam3(p_rng, output, output_len);
CAMLreturn(Val_int(mbedtls_ctr_drbg_random(CtrDrbg_val(p_rng), String_val(output), Int_val(output_len))));
}
CAMLprim value ml_mbedtls_ctr_drbg_seed(value ctx, value p_entropy, value custom) {
CAMLparam2(ctx, custom);
CAMLreturn(Val_int(mbedtls_ctr_drbg_seed(CtrDrbg_val(ctx), mbedtls_entropy_func, PVoid_val(p_entropy), NULL, 0)));
}
// Entropy
#define Entropy_val(v) (*((mbedtls_entropy_context**) Data_custom_val(v)))
static void ml_mbedtls_entropy_finalize(value v) {
mbedtls_entropy_context* entropy = Entropy_val(v);
if (entropy != NULL) {
mbedtls_entropy_free(entropy);
}
}
static struct custom_operations entropy_ops = {
.identifier = "ml_entropy",
.finalize = ml_mbedtls_entropy_finalize,
.compare = custom_compare_default,
.hash = custom_hash_default,
.serialize = custom_serialize_default,
.deserialize = custom_deserialize_default,
};
CAMLprim value ml_mbedtls_entropy_init(void) {
CAMLparam0();
CAMLlocal1(obj);
obj = caml_alloc_custom(&entropy_ops, sizeof(mbedtls_entropy_context*), 0, 1);
mbedtls_entropy_context* entropy = malloc(sizeof(mbedtls_entropy_context));
mbedtls_entropy_init(entropy);
Entropy_val(obj) = entropy;
CAMLreturn(obj);
}
CAMLprim value ml_mbedtls_entropy_func(value data, value output, value len) {
CAMLparam3(data, output, len);
CAMLreturn(Val_int(mbedtls_entropy_func(PVoid_val(data), String_val(output), Int_val(len))));
}
// Certificate
#define X509Crt_val(v) (*((mbedtls_x509_crt**) Data_custom_val(v)))
static void ml_mbedtls_x509_crt_finalize(value v) {
mbedtls_x509_crt* x509_crt = X509Crt_val(v);
if (x509_crt != NULL) {
mbedtls_x509_crt_free(x509_crt);
}
}
static struct custom_operations x509_crt_ops = {
.identifier = "ml_x509_crt",
.finalize = ml_mbedtls_x509_crt_finalize,
.compare = custom_compare_default,
.hash = custom_hash_default,
.serialize = custom_serialize_default,
.deserialize = custom_deserialize_default,
};
CAMLprim value ml_mbedtls_x509_crt_init(void) {
CAMLparam0();
CAMLlocal1(obj);
obj = caml_alloc_custom(&x509_crt_ops, sizeof(mbedtls_x509_crt*), 0, 1);
mbedtls_x509_crt* x509_crt = malloc(sizeof(mbedtls_x509_crt));
mbedtls_x509_crt_init(x509_crt);
X509Crt_val(obj) = x509_crt;
CAMLreturn(obj);
}
CAMLprim value ml_mbedtls_x509_next(value chain) {
CAMLparam1(chain);
CAMLlocal2(r, obj);
mbedtls_x509_crt* cert = X509Crt_val(chain);
if (cert->next == NULL) {
CAMLreturn(Val_none);
}
obj = caml_alloc_custom(&x509_crt_ops, sizeof(mbedtls_x509_crt*), 0, 1);
X509Crt_val(obj) = cert->next;
CAMLreturn(Val_some(obj));
}
CAMLprim value ml_mbedtls_x509_crt_parse(value chain, value bytes) {
CAMLparam2(chain, bytes);
const char* buf = String_val(bytes);
int len = caml_string_length(bytes);
CAMLreturn(Val_int(mbedtls_x509_crt_parse(X509Crt_val(chain), buf, len + 1)));
}
CAMLprim value ml_mbedtls_x509_crt_parse_file(value chain, value path) {
CAMLparam2(chain, path);
CAMLreturn(Val_int(mbedtls_x509_crt_parse_file(X509Crt_val(chain), String_val(path))));
}
CAMLprim value ml_mbedtls_x509_crt_parse_path(value chain, value path) {
CAMLparam2(chain, path);
CAMLreturn(Val_int(mbedtls_x509_crt_parse_path(X509Crt_val(chain), String_val(path))));
}
// Certificate Haxe API
value caml_string_of_asn1_buf(mbedtls_asn1_buf* dat) {
CAMLparam0();
CAMLlocal1(s);
s = caml_alloc_string(dat->len);
memcpy(String_val(s), dat->p, dat->len);
CAMLreturn(s);
}
CAMLprim value hx_cert_get_alt_names(value chain) {
CAMLparam1(chain);
CAMLlocal1(obj);
mbedtls_x509_crt* cert = X509Crt_val(chain);
if (cert->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME == 0 || &cert->subject_alt_names == NULL) {
obj = Atom(0);
} else {
mbedtls_asn1_sequence* cur = &cert->subject_alt_names;
int i = 0;
while (cur != NULL) {
++i;
cur = cur->next;
}
obj = caml_alloc(i, 0);
cur = &cert->subject_alt_names;
i = 0;
while (cur != NULL) {
Store_field(obj, i, caml_string_of_asn1_buf(&cur->buf));
++i;
cur = cur->next;
}
}
CAMLreturn(obj);
}
CAMLprim value hx_cert_get_subject(value chain, value objname) {
CAMLparam2(chain, objname);
mbedtls_x509_name *obj;
mbedtls_x509_crt* cert = X509Crt_val(chain);
const char *oname, *rname;
obj = &cert->subject;
rname = String_val(objname);
while (obj != NULL) {
int r = mbedtls_oid_get_attr_short_name(&obj->oid, &oname);
if (r == 0 && strcmp(oname, rname) == 0) {
CAMLreturn(Val_some(caml_string_of_asn1_buf(&obj->val)));
}
obj = obj->next;
}
CAMLreturn(Val_none);
}
CAMLprim value hx_cert_get_issuer(value chain, value objname) {
CAMLparam2(chain, objname);
mbedtls_x509_name *obj;
mbedtls_x509_crt* cert = X509Crt_val(chain);
int r;
const char *oname, *rname;
obj = &cert->issuer;
rname = String_val(objname);
while (obj != NULL) {
r = mbedtls_oid_get_attr_short_name(&obj->oid, &oname);
if (r == 0 && strcmp(oname, rname) == 0) {
CAMLreturn(Val_some(caml_string_of_asn1_buf(&obj->val)));
}
obj = obj->next;
}
CAMLreturn(Val_none);
}
time_t time_to_time_t(mbedtls_x509_time* t) {
struct tm info;
info.tm_year = t->year - 1900;
info.tm_mon = t->mon - 1;
info.tm_mday = t->day;
info.tm_hour = t->hour;
info.tm_min = t->min;
info.tm_sec = t->sec;
return mktime(&info);
}
CAMLprim value hx_cert_get_notafter(value chain) {
CAMLparam1(chain);
mbedtls_x509_crt* cert = X509Crt_val(chain);
mbedtls_x509_time *t = &cert->valid_to;
time_t time = time_to_time_t(t);
CAMLreturn(caml_copy_double((double)time));
}
CAMLprim value hx_cert_get_notbefore(value chain) {
CAMLparam1(chain);
mbedtls_x509_crt* cert = X509Crt_val(chain);
mbedtls_x509_time *t = &cert->valid_from;
time_t time = time_to_time_t(t);
CAMLreturn(caml_copy_double((double)time));
}
// Config
#define Config_val(v) (*((mbedtls_ssl_config**) Data_custom_val(v)))
static void ml_mbedtls_ssl_config_finalize(value v) {
mbedtls_ssl_config* ssl_config = Config_val(v);
if (ssl_config != NULL) {
mbedtls_ssl_config_free(ssl_config);
}
}
static struct custom_operations ssl_config_ops = {
.identifier = "ml_ssl_config",
.finalize = ml_mbedtls_ssl_config_finalize,
.compare = custom_compare_default,
.hash = custom_hash_default,
.serialize = custom_serialize_default,
.deserialize = custom_deserialize_default,
};
CAMLprim value ml_mbedtls_ssl_config_init(void) {
CAMLparam0();
CAMLlocal1(obj);
obj = caml_alloc_custom(&ssl_config_ops, sizeof(mbedtls_ssl_config*), 0, 1);
mbedtls_ssl_config* ssl_config = malloc(sizeof(mbedtls_ssl_config));
mbedtls_ssl_config_init(ssl_config);
Config_val(obj) = ssl_config;
CAMLreturn(obj);
}
CAMLprim value ml_mbedtls_ssl_conf_authmode(value conf, value authmode) {
CAMLparam2(conf, authmode);
mbedtls_ssl_conf_authmode(Config_val(conf), Int_val(authmode));
CAMLreturn(Val_unit);
}
CAMLprim value ml_mbedtls_ssl_conf_ca_chain(value conf, value ca_chain) {
CAMLparam2(conf, ca_chain);
mbedtls_ssl_conf_ca_chain(Config_val(conf), X509Crt_val(ca_chain), NULL);
CAMLreturn(Val_unit);
}
CAMLprim value ml_mbedtls_ssl_config_defaults(value conf, value endpoint, value transport, value preset) {
CAMLparam4(conf, endpoint, transport, preset);
CAMLreturn(Val_int(mbedtls_ssl_config_defaults(Config_val(conf), Int_val(endpoint), Int_val(transport), Int_val(preset))));
}
CAMLprim value ml_mbedtls_ssl_conf_rng(value conf, value p_rng) {
CAMLparam2(conf, p_rng);
mbedtls_ssl_conf_rng(Config_val(conf), mbedtls_ctr_drbg_random, PVoid_val(p_rng));
CAMLreturn(Val_unit);
}
// Pk
#define PkContext_val(v) (*((mbedtls_pk_context**) Data_custom_val(v)))
static void ml_mbedtls_pk_context_finalize(value v) {
mbedtls_pk_context* pk_context = PkContext_val(v);
if (pk_context != NULL) {
mbedtls_pk_free(pk_context);
}
}
static struct custom_operations pk_context_ops = {
.identifier = "ml_pk_context",
.finalize = ml_mbedtls_pk_context_finalize,
.compare = custom_compare_default,
.hash = custom_hash_default,
.serialize = custom_serialize_default,
.deserialize = custom_deserialize_default,
};
CAMLprim value ml_mbedtls_pk_init(void) {
CAMLparam0();
CAMLlocal1(obj);
obj = caml_alloc_custom(&pk_context_ops, sizeof(mbedtls_pk_context*), 0, 1);
mbedtls_pk_context* pk_context = malloc(sizeof(mbedtls_pk_context));
mbedtls_pk_init(pk_context);
PkContext_val(obj) = pk_context;
CAMLreturn(obj);
}
CAMLprim value ml_mbedtls_pk_parse_key(value ctx, value key, value password) {
CAMLparam3(ctx, key, password);
const char* pwd = NULL;
size_t pwdlen = 0;
if (password != Val_none) {
pwd = String_val(Field(password, 0));
pwdlen = caml_string_length(Field(password, 0));
}
CAMLreturn(mbedtls_pk_parse_key(PkContext_val(ctx), String_val(key), caml_string_length(key) + 1, pwd, pwdlen));
}
CAMLprim value ml_mbedtls_pk_parse_keyfile(value ctx, value path, value password) {
CAMLparam3(ctx, path, password);
const char* pwd = NULL;
if (password != Val_none) {
pwd = String_val(Field(password, 0));
}
CAMLreturn(mbedtls_pk_parse_keyfile(PkContext_val(ctx), String_val(path), pwd));
}
CAMLprim value ml_mbedtls_pk_parse_public_key(value ctx, value key) {
CAMLparam2(ctx, key);
CAMLreturn(mbedtls_pk_parse_public_key(PkContext_val(ctx), String_val(key), caml_string_length(key) + 1));
}
CAMLprim value ml_mbedtls_pk_parse_public_keyfile(value ctx, value path) {
CAMLparam2(ctx, path);
CAMLreturn(mbedtls_pk_parse_public_keyfile(PkContext_val(ctx), String_val(path)));
}
// Ssl
#define SslContext_val(v) (*((mbedtls_ssl_context**) Data_custom_val(v)))
static void ml_mbedtls_ssl_context_finalize(value v) {
mbedtls_ssl_context* ssl_context = SslContext_val(v);
if (ssl_context != NULL) {
mbedtls_ssl_free(ssl_context);
}
}
static struct custom_operations ssl_context_ops = {
.identifier = "ml_ssl_context",
.finalize = ml_mbedtls_ssl_context_finalize,
.compare = custom_compare_default,
.hash = custom_hash_default,
.serialize = custom_serialize_default,
.deserialize = custom_deserialize_default,
};
CAMLprim value ml_mbedtls_ssl_init(void) {
CAMLparam0();
CAMLlocal1(obj);
obj = caml_alloc_custom(&ssl_context_ops, sizeof(mbedtls_ssl_context*), 0, 1);
mbedtls_ssl_context* ssl_context = malloc(sizeof(mbedtls_ssl_context));
mbedtls_ssl_init(ssl_context);
SslContext_val(obj) = ssl_context;
CAMLreturn(obj);
}
CAMLprim value ml_mbedtls_ssl_get_peer_cert(value ssl) {
CAMLparam1(ssl);
CAMLlocal1(obj);
mbedtls_ssl_context* ssl_context = SslContext_val(ssl);
mbedtls_x509_crt* crt = (mbedtls_x509_crt*)mbedtls_ssl_get_peer_cert(ssl_context);
if (crt == NULL) {
CAMLreturn(Val_none);
}
obj = caml_alloc_custom(&x509_crt_ops, sizeof(mbedtls_x509_crt*), 0, 1);
X509Crt_val(obj) = crt;
CAMLreturn(Val_some(obj));
}
CAMLprim value ml_mbedtls_ssl_handshake(value ssl) {
CAMLparam1(ssl);
CAMLreturn(Val_int(mbedtls_ssl_handshake(SslContext_val(ssl))));
}
CAMLprim value ml_mbedtls_ssl_read(value ssl, value buf, value pos, value len) {
CAMLparam4(ssl, buf, pos, len);
CAMLreturn(Val_int(mbedtls_ssl_read(SslContext_val(ssl), String_val(buf) + Int_val(pos), Int_val(len))));
}
static int bio_write_cb(void* ctx, const unsigned char* buf, size_t len) {
CAMLparam0();
CAMLlocal3(r, s, vctx);
vctx = (value)ctx;
s = caml_alloc_string(len);
memcpy(String_val(s), buf, len);
r = caml_callback2(Field(vctx, 1), Field(vctx, 0), s);
CAMLreturn(Int_val(r));
}
static int bio_read_cb(void* ctx, unsigned char* buf, size_t len) {
CAMLparam0();
CAMLlocal3(r, s, vctx);
vctx = (value)ctx;
s = caml_alloc_string(len);
r = caml_callback2(Field(vctx, 2), Field(vctx, 0), s);
memcpy(buf, String_val(s), len);
CAMLreturn(Int_val(r));
}
CAMLprim value ml_mbedtls_ssl_set_bio(value ssl, value p_bio, value f_send, value f_recv) {
CAMLparam4(ssl, p_bio, f_send, f_recv);
CAMLlocal1(ctx);
ctx = caml_alloc(3, 0);
Store_field(ctx, 0, p_bio);
Store_field(ctx, 1, f_send);
Store_field(ctx, 2, f_recv);
mbedtls_ssl_set_bio(SslContext_val(ssl), (void*)ctx, bio_write_cb, bio_read_cb, NULL);
CAMLreturn(Val_unit);
}
CAMLprim value ml_mbedtls_ssl_set_hostname(value ssl, value hostname) {
CAMLparam2(ssl, hostname);
CAMLreturn(Val_int(mbedtls_ssl_set_hostname(SslContext_val(ssl), String_val(hostname))));
}
CAMLprim value ml_mbedtls_ssl_setup(value ssl, value conf) {
CAMLparam2(ssl, conf);
CAMLreturn(Val_int(mbedtls_ssl_setup(SslContext_val(ssl), Config_val(conf))));
}
CAMLprim value ml_mbedtls_ssl_write(value ssl, value buf, value pos, value len) {
CAMLparam4(ssl, buf, pos, len);
CAMLreturn(Val_int(mbedtls_ssl_write(SslContext_val(ssl), String_val(buf) + Int_val(pos), Int_val(len))));
}
// glue
CAMLprim value hx_cert_load_defaults(value certificate) {
CAMLparam1(certificate);
int r = 1;
mbedtls_x509_crt *chain = X509Crt_val(certificate);
#ifdef _WIN32
HCERTSTORE store;
PCCERT_CONTEXT cert;
if (store = CertOpenSystemStore(0, "Root")) {
cert = NULL;
while (cert = CertEnumCertificatesInStore(store, cert)) {
r = mbedtls_x509_crt_parse_der(chain, (unsigned char *)cert->pbCertEncoded, cert->cbCertEncoded);
if (r != 0) {
CAMLreturn(Val_int(r));
}
}
CertCloseStore(store, 0);
}
#endif
#ifdef __APPLE__
CFMutableDictionaryRef search;
CFArrayRef result;
SecKeychainRef keychain;
SecCertificateRef item;
CFDataRef dat;
// Load keychain
if (SecKeychainOpen("/System/Library/Keychains/SystemRootCertificates.keychain", &keychain) == errSecSuccess) {
// Search for certificates
search = CFDictionaryCreateMutable(NULL, 0, NULL, NULL);
CFDictionarySetValue(search, kSecClass, kSecClassCertificate);
CFDictionarySetValue(search, kSecMatchLimit, kSecMatchLimitAll);
CFDictionarySetValue(search, kSecReturnRef, kCFBooleanTrue);
CFDictionarySetValue(search, kSecMatchSearchList, CFArrayCreate(NULL, (const void **)&keychain, 1, NULL));
if (SecItemCopyMatching(search, (CFTypeRef *)&result) == errSecSuccess) {
CFIndex n = CFArrayGetCount(result);
for (CFIndex i = 0; i < n; i++) {
item = (SecCertificateRef)CFArrayGetValueAtIndex(result, i);
// Get certificate in DER format
dat = SecCertificateCopyData(item);
if (dat) {
r = mbedtls_x509_crt_parse_der(chain, (unsigned char *)CFDataGetBytePtr(dat), CFDataGetLength(dat));
CFRelease(dat);
if (r != 0) {
CAMLreturn(Val_int(r));
}
}
}
}
CFRelease(keychain);
}
#endif
CAMLreturn(Val_int(r));
}
static value build_fields(int num_fields, const char* names[], int values[]) {
CAMLparam0();
CAMLlocal2(ret, tuple);
ret = caml_alloc(num_fields, 0);
for (int i = 0; i < num_fields; ++i) {
tuple = caml_alloc_tuple(2);
Store_field(tuple, 0, caml_copy_string(names[i]));
Store_field(tuple, 1, Val_int(values[i]));
Store_field(ret, i, tuple);
}
CAMLreturn(ret);
}
CAMLprim value hx_get_ssl_authmode_flags(value unit) {
CAMLparam1(unit);
const char* names[] = {"SSL_VERIFY_NONE", "SSL_VERIFY_OPTIONAL", "SSL_VERIFY_REQUIRED"};
int values[] = {MBEDTLS_SSL_VERIFY_NONE, MBEDTLS_SSL_VERIFY_OPTIONAL, MBEDTLS_SSL_VERIFY_REQUIRED};
CAMLreturn(build_fields(sizeof(values) / sizeof(values[0]), names, values));
}
CAMLprim value hx_get_ssl_endpoint_flags(value unit) {
CAMLparam1(unit);
const char* names[] = {"SSL_IS_CLIENT", "SSL_IS_SERVER"};
int values[] = {MBEDTLS_SSL_IS_CLIENT, MBEDTLS_SSL_IS_SERVER};
CAMLreturn(build_fields(sizeof(values) / sizeof(values[0]), names, values));
}
CAMLprim value hx_get_ssl_preset_flags(value unit) {
CAMLparam1(unit);
const char* names[] = {"SSL_PRESET_DEFAULT", "SSL_PRESET_SUITEB"};
int values[] = {MBEDTLS_SSL_PRESET_DEFAULT, MBEDTLS_SSL_PRESET_SUITEB};
CAMLreturn(build_fields(sizeof(values) / sizeof(values[0]), names, values));
}
CAMLprim value hx_get_ssl_transport_flags(value unit) {
CAMLparam1(unit);
const char* names[] = {"SSL_TRANSPORT_STREAM", "SSL_TRANSPORT_DATAGRAM"};
int values[] = {MBEDTLS_SSL_TRANSPORT_STREAM, MBEDTLS_SSL_TRANSPORT_DATAGRAM};
CAMLreturn(build_fields(sizeof(values) / sizeof(values[0]), names, values));
}