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/* This file is included into nettls_gnutls_bindings_stubs.c */
#include "./config.h"
#include <gnutls/gnutls.h>
#include <gnutls/openpgp.h>
#include <gnutls/x509.h>
#ifdef HAVE_GNUTLS_CRYPTO_H
#include <gnutls/crypto.h>
#endif
#ifdef HAVE_GNUTLS_ABSTRACT_H
#include <gnutls/abstract.h>
#endif
#include <errno.h>
#pragma GCC diagnostic ignored "-Wunused-function"
static int initialized = 0;
void nettls_init(void) {
int code;
if (!initialized) {
code = gnutls_global_init();
if (code != GNUTLS_E_SUCCESS) {
fprintf(stderr, "Nettls_gnutls: cannot initialize: %s\n",
gnutls_strerror(code));
}
else
initialized = 1;
}
}
void nettls_deinit(void) {
if (initialized) {
gnutls_global_deinit();
initialized = 0;
}
}
typedef int error_code;
typedef unsigned int gnutls_init_flags;
typedef unsigned int key_usage;
typedef const char * const_charp;
typedef gnutls_datum_t str_datum;
typedef gnutls_datum_t * str_datum_p;
typedef const gnutls_datum_t * const_str_datum_p;
#define DUMMY 0
typedef unsigned int empty_flags;
#define wrap_const_str_datum_p wrap_str_datum_p
#define unwrap_const_str_datum_p unwrap_str_datum_p
static value wrap_error_code(error_code x);
static value wrap_gnutls_x509_crt_t(gnutls_x509_crt_t x);
static value wrap_gnutls_x509_crl_t(gnutls_x509_crl_t x);
static gnutls_session_t
unwrap_gnutls_session_t(value v);
static void
attach_gnutls_session_t(value v, value aux);
static gnutls_certificate_credentials_t
unwrap_gnutls_certificate_credentials_t(value v);
static void
attach_gnutls_certificate_credentials_t(value v, value aux);
static gnutls_srp_client_credentials_t
unwrap_gnutls_srp_client_credentials_t(value v);
static gnutls_srp_server_credentials_t
unwrap_gnutls_srp_server_credentials_t(value v);
static gnutls_psk_client_credentials_t
unwrap_gnutls_psk_client_credentials_t(value v);
static gnutls_psk_server_credentials_t
unwrap_gnutls_psk_server_credentials_t(value v);
static gnutls_anon_client_credentials_t
unwrap_gnutls_anon_client_credentials_t(value v);
static gnutls_anon_server_credentials_t
unwrap_gnutls_anon_server_credentials_t(value v);
static gnutls_x509_crt_fmt_t
unwrap_gnutls_x509_crt_fmt_t(value v);
static gnutls_certificate_import_flags
unwrap_gnutls_certificate_import_flags(value v);
#define raise_null_pointer net_gnutls_null_pointer
static void net_gnutls_null_pointer(void) {
caml_raise_constant(*caml_named_value
("Nettls_gnutls_bindings.Null_pointer"));
}
static const char * unwrap_charp(value dummy) { return NULL; }
static value wrap_str_datum(const gnutls_datum_t d) {
value s;
s = caml_alloc_string(d.size);
memcpy(String_val(s), d.data, d.size);
return s;
}
static value wrap_str_datum_p(const gnutls_datum_t *d) {
if (d==NULL) net_gnutls_null_pointer();
return wrap_str_datum(*d);
}
static gnutls_datum_t unwrap_str_datum(value v) {
gnutls_datum_t d;
d.size = caml_string_length(v);
d.data = stat_alloc(d.size);
memcpy(d.data, String_val(v), d.size);
return d;
}
static gnutls_datum_t * unwrap_str_datum_p(value v) {
gnutls_datum_t *d;
d = stat_alloc(sizeof(gnutls_datum_t));
*d = unwrap_str_datum(v);
return d;
}
static void free_str_datum(gnutls_datum_t d) {
if (d.data != NULL) { stat_free(d.data); d.data = NULL; };
}
static void free_str_datum_p(gnutls_datum_t *d) {
if (d != NULL) {
if (d->data != NULL) stat_free(d->data);
stat_free(d);
}
}
static void net_gnutls_error_check(int error_code) {
if (error_code < 0) {
caml_raise_with_arg(*caml_named_value("Nettls_gnutls_bindings.Error"),
wrap_error_code(error_code));
}
}
static void net_gnutls_size_check(int error_code, size_t s) {
if (error_code == GNUTLS_E_SHORT_MEMORY_BUFFER) {
caml_raise_with_arg(*caml_named_value
("Nettls_gnutls_bindings.Short_memory_buffer"),
Val_long(s));
}
}
/*
static void net_gnutls_transport_set_int(gnutls_session_t s,long fd) {
gnutls_transport_set_ptr(s, (gnutls_transport_ptr_t) fd);
}
*/
struct b_session_callbacks_st {
gnutls_session_t session;
value pull_fun; /* memory -> int unix_code */
value pull_timeout_fun; /* int -> int unix_code */
value push_fun; /* memory -> int -> int unix_code */
value verify_fun; /* unit -> bool */
/* value params_fun; */
value db_retrieve_fun; /* string -> string */
value db_store_fun; /* string -> string -> unit */
value db_remove_fun; /* string -> unit */
};
typedef struct b_session_callbacks_st *b_session_callbacks_t;
static int get_transport_errno(value r) {
switch (Int_val(r)) {
case 0:
return EINTR;
case 1:
return EAGAIN;
case 2:
return EMSGSIZE;
case 3:
return EPERM;
default:
return EPERM;
}
}
static ssize_t push_callback(gnutls_transport_ptr_t cb_ptr, const void *data,
size_t size) {
b_session_callbacks_t cb;
int flags;
ssize_t n;
CAMLparam0();
CAMLlocal2(ba,r);
cb = (b_session_callbacks_t) cb_ptr;
if (Is_block(cb->push_fun)) {
flags = CAML_BA_UINT8 | CAML_BA_C_LAYOUT | CAML_BA_EXTERNAL;
ba = caml_ba_alloc_dims(flags, 1, (void *) data, (intnat) size);
r = caml_callback2_exn(cb->push_fun, ba, Val_long(size));
if (Is_exception_result(r)) {
r = Extract_exception(r);
gnutls_transport_set_errno(cb->session, EPERM);
n = -1;
}
else {
/* r is an [int unix_code] */
if (Is_block(r)) {
n = Long_val(Field(r, 0));
if (n<0) {
gnutls_transport_set_errno(cb->session, EPERM);
n = -1;
}
}
else {
gnutls_transport_set_errno(cb->session, get_transport_errno(r));
n = -1;
}
}
} else {
gnutls_transport_set_errno(cb->session, EPERM);
n = -1;
};
CAMLreturn(n);
}
static ssize_t pull_callback(gnutls_transport_ptr_t cb_ptr, void *data,
size_t size) {
b_session_callbacks_t cb;
int flags;
ssize_t n;
CAMLparam0();
CAMLlocal2(ba,r);
cb = (b_session_callbacks_t) cb_ptr;
if (Is_block(cb->pull_fun)) {
flags = CAML_BA_UINT8 | CAML_BA_C_LAYOUT | CAML_BA_EXTERNAL;
ba = caml_ba_alloc_dims(flags, 1, data, (intnat) size);
r = caml_callback_exn(cb->pull_fun, ba);
if (Is_exception_result(r)) {
r = Extract_exception(r);
gnutls_transport_set_errno(cb->session, EPERM);
n = -1;
}
else {
/* r is an [int unix_code] */
if (Is_block(r)) {
n = Long_val(Field(r, 0));
if (n<0) {
gnutls_transport_set_errno(cb->session, EPERM);
n = -1;
}
}
else {
gnutls_transport_set_errno(cb->session, get_transport_errno(r));
n = -1;
}
}
} else {
gnutls_transport_set_errno(cb->session, EPERM);
n = -1;
};
CAMLreturn(n);
}
static int pull_timeout_callback(gnutls_transport_ptr_t cb_ptr,
unsigned int ms) {
b_session_callbacks_t cb;
int n;
CAMLparam0();
CAMLlocal1(r);
cb = (b_session_callbacks_t) cb_ptr;
if (Is_block(cb->pull_timeout_fun)) {
r = caml_callback_exn(cb->pull_timeout_fun, Val_int(ms));
if (Is_exception_result(r)) {
r = Extract_exception(r);
gnutls_transport_set_errno(cb->session, EPERM);
n = -1;
}
else {
/* r is an [int unix_code] */
if (Is_block(r)) {
n = Long_val(Field(r, 0));
if (n<0) {
gnutls_transport_set_errno(cb->session, EPERM);
n = -1;
}
}
else {
gnutls_transport_set_errno(cb->session, get_transport_errno(r));
n = -1;
}
}
} else {
gnutls_transport_set_errno(cb->session, EPERM);
n = -1;
};
CAMLreturn(n);
}
static int verify_callback(gnutls_session_t s) {
b_session_callbacks_t cb;
int n;
CAMLparam0();
CAMLlocal1(r);
cb = (b_session_callbacks_t) gnutls_session_get_ptr(s);
if (Is_block(cb->verify_fun)) {
r = caml_callback_exn(cb->verify_fun, Val_unit);
if (Is_exception_result(r)) {
r = Extract_exception(r);
n = 1;
}
else
n = Bool_val(r) ? 0 : 1;
}
else
n=0;
CAMLreturn(n);
}
static int db_store_callback(void *ptr, gnutls_datum_t key,
gnutls_datum_t data) {
b_session_callbacks_t cb;
int n;
CAMLparam0();
CAMLlocal3(r, keyv, datav);
cb = (b_session_callbacks_t) ptr;
if (Is_block(cb->db_store_fun)) {
keyv = wrap_str_datum(key);
datav = wrap_str_datum(data);
r = caml_callback2_exn(cb->db_store_fun, keyv, datav);
if (Is_exception_result(r)) {
r = Extract_exception(r);
n = 1;
}
else
n = 0;
}
else
n = 1;
CAMLreturn(n);
}
static int db_remove_callback(void *ptr, gnutls_datum_t key) {
b_session_callbacks_t cb;
int n;
CAMLparam0();
CAMLlocal2(r, keyv);
cb = (b_session_callbacks_t) ptr;
if (Is_block(cb->db_remove_fun)) {
keyv = wrap_str_datum(key);
r = caml_callback_exn(cb->db_remove_fun, keyv);
if (Is_exception_result(r)) {
r = Extract_exception(r);
n = 1;
}
else
n = 0;
}
else
n = 1;
CAMLreturn(n);
}
static gnutls_datum_t db_retrieve_callback(void *ptr, gnutls_datum_t key) {
b_session_callbacks_t cb;
gnutls_datum_t r;
CAMLparam0();
CAMLlocal2(keyv, datav);
r.data = NULL;
r.size = 0;
cb = (b_session_callbacks_t) ptr;
if (Is_block(cb->db_retrieve_fun)) {
keyv = wrap_str_datum(key);
datav = caml_callback_exn(cb->db_retrieve_fun, keyv);
if (Is_exception_result(datav)) {
datav = Extract_exception(datav);
}
else {
r.size = caml_string_length(datav);
r.data = gnutls_malloc(r.size);
memcpy(r.data, String_val(datav), r.size);
}
};
CAMLreturnT(gnutls_datum_t, r);
}
static void attach_session_callbacks (gnutls_session_t s) {
b_session_callbacks_t cb;
cb = (b_session_callbacks_t)
stat_alloc(sizeof(struct b_session_callbacks_st));
cb->session = s;
cb->pull_fun = Val_int(0);
cb->pull_timeout_fun = Val_int(0);
cb->push_fun = Val_int(0);
cb->verify_fun = Val_int(0);
/* cb->params_fun = Val_int(0); */
cb->db_retrieve_fun = Val_int(0);
cb->db_store_fun = Val_int(0);
cb->db_remove_fun = Val_int(0);
caml_register_generational_global_root(&(cb->pull_fun));
caml_register_generational_global_root(&(cb->pull_timeout_fun));
caml_register_generational_global_root(&(cb->push_fun));
caml_register_generational_global_root(&(cb->verify_fun));
/* caml_register_generational_global_root(&(cb->params_fun));*/
caml_register_generational_global_root(&(cb->db_retrieve_fun));
caml_register_generational_global_root(&(cb->db_store_fun));
caml_register_generational_global_root(&(cb->db_remove_fun));
gnutls_session_set_ptr(s, cb);
gnutls_transport_set_ptr(s, cb);
gnutls_db_set_ptr(s, cb);
gnutls_transport_set_push_function(s, &push_callback);
gnutls_transport_set_pull_function(s, &pull_callback);
#ifdef HAVE_FUN_gnutls_transport_set_pull_timeout_function
gnutls_transport_set_pull_timeout_function(s, &pull_timeout_callback);
#endif
/*
gnutls_db_set_retrieve_function: see net_b_set_db_callbacks
gnutls_db_set_remove_function: see net_b_set_db_callbacks
gnutls_db_set_store_function: see net_b_set_db_callbacks
*/
/* verify_callback: this is set in net_gnutls_credentials_set for
the certificate once it is connected with the session. (The
callback is the same for all sessions, so this is no problem.)
*/
}
static void b_free_session(gnutls_session_t s) {
b_session_callbacks_t cb;
cb = gnutls_session_get_ptr(s);
caml_remove_generational_global_root(&(cb->pull_fun));
caml_remove_generational_global_root(&(cb->pull_timeout_fun));
caml_remove_generational_global_root(&(cb->push_fun));
caml_remove_generational_global_root(&(cb->verify_fun));
/* caml_remove_generational_global_root(&(cb->params_fun)); */
caml_remove_generational_global_root(&(cb->db_retrieve_fun));
caml_remove_generational_global_root(&(cb->db_store_fun));
caml_remove_generational_global_root(&(cb->db_remove_fun));
stat_free(cb);
gnutls_deinit(s);
}
CAMLprim value net_b_set_pull_callback(value sv, value fun) {
gnutls_session_t s;
b_session_callbacks_t cb;
nettls_init();
s = unwrap_gnutls_session_t(sv);
cb = gnutls_session_get_ptr(s);
caml_modify_generational_global_root(&(cb->pull_fun), fun);
return Val_unit;
}
CAMLprim value net_b_set_pull_timeout_callback(value sv, value fun) {
#ifdef HAVE_FUN_gnutls_transport_set_pull_timeout_function
gnutls_session_t s;
b_session_callbacks_t cb;
nettls_init();
s = unwrap_gnutls_session_t(sv);
cb = gnutls_session_get_ptr(s);
caml_modify_generational_global_root(&(cb->pull_timeout_fun), fun);
return Val_unit;
#else
invalid_argument("b_set_pull_timeout_callback");
#endif
}
CAMLprim value net_b_set_push_callback(value sv, value fun) {
gnutls_session_t s;
b_session_callbacks_t cb;
nettls_init();
s = unwrap_gnutls_session_t(sv);
cb = gnutls_session_get_ptr(s);
caml_modify_generational_global_root(&(cb->push_fun), fun);
return Val_unit;
}
CAMLprim value net_b_set_verify_callback(value sv, value fun) {
#ifdef HAVE_FUN_gnutls_certificate_set_verify_function
gnutls_session_t s;
b_session_callbacks_t cb;
nettls_init();
s = unwrap_gnutls_session_t(sv);
cb = gnutls_session_get_ptr(s);
caml_modify_generational_global_root(&(cb->verify_fun), fun);
return Val_unit;
#else
invalid_argument("b_set_verify_callback");
#endif
}
CAMLprim value net_b_set_db_callbacks(value sv,
value store_fun,
value remove_fun,
value retrieve_fun) {
gnutls_session_t s;
b_session_callbacks_t cb;
nettls_init();
s = unwrap_gnutls_session_t(sv);
cb = gnutls_session_get_ptr(s);
gnutls_db_set_retrieve_function(s, &db_retrieve_callback);
gnutls_db_set_remove_function(s, &db_remove_callback);
gnutls_db_set_store_function(s, &db_store_callback);
caml_modify_generational_global_root(&(cb->db_store_fun), store_fun);
caml_modify_generational_global_root(&(cb->db_remove_fun), remove_fun);
caml_modify_generational_global_root(&(cb->db_retrieve_fun), retrieve_fun);
return Val_unit;
}
CAMLprim value net_gnutls_credentials_set(value sess, value creds) {
gnutls_session_t s;
int error_code;
CAMLparam2(sess,creds);
nettls_init();
s = unwrap_gnutls_session_t(sess);
switch (Long_val(Field(creds,0))) {
case H_Certificate: {
gnutls_certificate_credentials_t cert;
cert = unwrap_gnutls_certificate_credentials_t(Field(creds,1));
error_code =
gnutls_credentials_set(s, GNUTLS_CRD_CERTIFICATE, cert);
#ifdef HAVE_FUN_gnutls_certificate_set_verify_function
if (error_code == 0)
gnutls_certificate_set_verify_function(cert, &verify_callback);
#endif
break;
}
case H_Srp_client:
error_code =
gnutls_credentials_set(s,
GNUTLS_CRD_SRP,
unwrap_gnutls_srp_client_credentials_t
(Field(creds,1))
);
break;
case H_Srp_server:
error_code =
gnutls_credentials_set(s,
GNUTLS_CRD_SRP,
unwrap_gnutls_srp_server_credentials_t
(Field(creds,1))
);
break;
case H_Anon_client:
error_code =
gnutls_credentials_set(s,
GNUTLS_CRD_ANON,
unwrap_gnutls_anon_client_credentials_t
(Field(creds,1))
);
break;
case H_Anon_server:
error_code =
gnutls_credentials_set(s,
GNUTLS_CRD_ANON,
unwrap_gnutls_anon_server_credentials_t
(Field(creds,1))
);
break;
case H_Psk_client:
error_code =
gnutls_credentials_set(s,
GNUTLS_CRD_PSK,
unwrap_gnutls_psk_client_credentials_t
(Field(creds,1))
);
break;
case H_Psk_server:
error_code =
gnutls_credentials_set(s,
GNUTLS_CRD_CERTIFICATE,
unwrap_gnutls_psk_server_credentials_t
(Field(creds,1))
);
break;
default:
failwith("net_gnutls_credentials_set");
};
net_gnutls_error_check(error_code);
attach_gnutls_session_t(sess, creds);
CAMLreturn(Val_unit);
}
CAMLprim value net_gnutls_x509_crt_list_import(value datav, value formatv,
value flagsv) {
gnutls_datum_t data;
gnutls_x509_crt_fmt_t format;
unsigned int flags;
gnutls_x509_crt_t cert1;
gnutls_x509_crt_t *certs;
unsigned int n;
int code, k, alloc_certs;
CAMLparam3(datav, formatv, flagsv);
CAMLlocal2(array, crt);
nettls_init();
data = unwrap_str_datum(datav);
format = unwrap_gnutls_x509_crt_fmt_t(formatv);
flags = unwrap_gnutls_certificate_import_flags(flagsv);
certs = &cert1;
n = 1;
alloc_certs = 0;
code = gnutls_x509_crt_list_import(certs, &n, &data, format,
flags | GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED);
if (code == GNUTLS_E_SHORT_MEMORY_BUFFER) {
certs = (gnutls_x509_crt_t *) stat_alloc(n * sizeof(void *));
alloc_certs = 1;
code = gnutls_x509_crt_list_import(certs, &n, &data, format,
flags);
};
if (code >= 0) {
array = caml_alloc(code, 0);
for (k = 0; k < code; k++) {
crt = wrap_gnutls_x509_crt_t(certs[k]);
Store_field(array, k, crt);
};
};
if (alloc_certs)
stat_free(certs);
net_gnutls_error_check(code);
CAMLreturn(array);
}
CAMLprim value net_gnutls_x509_crl_list_import(value datav, value formatv,
value flagsv) {
#ifdef HAVE_FUN_net_gnutls_x509_crl_list_import
gnutls_datum_t data;
gnutls_x509_crt_fmt_t format;
unsigned int flags;
gnutls_x509_crl_t cert1;
gnutls_x509_crl_t *certs;
unsigned int n;
int code, k, alloc_certs;
CAMLparam3(datav, formatv, flagsv);
CAMLlocal2(array, crt);
nettls_init();
data = unwrap_str_datum(datav);
format = unwrap_gnutls_x509_crt_fmt_t(formatv);
flags = unwrap_gnutls_certificate_import_flags(flagsv);
certs = &cert1;
n = 1;
alloc_certs = 0;
code = gnutls_x509_crl_list_import(certs, &n, &data, format,
flags | GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED);
if (code == GNUTLS_E_SHORT_MEMORY_BUFFER) {
certs = (gnutls_x509_crl_t *) stat_alloc(n * sizeof(void *));
alloc_certs = 1;
code = gnutls_x509_crl_list_import(certs, &n, &data, format,
flags);
};
if (code >= 0) {
array = caml_alloc(code, 0);
for (k = 0; k < code; k++) {
crt = wrap_gnutls_x509_crl_t(certs[k]);
Store_field(array, k, crt);
};
};
if (alloc_certs)
stat_free(certs);
net_gnutls_error_check(code);
CAMLreturn(array);
#else
invalid_argument("gnutls_x509_crl_list_import");
#endif
}
static int net_have_crypto(void) {
#ifdef HAVE_FUN_gnutls_cipher_encrypt2
return 1;
#else
return 0;
#endif
}
#ifndef HAVE_GNUTLS_ABSTRACT_H
typedef void *gnutls_pubkey_t;
typedef void *gnutls_privkey_t;
static void gnutls_pubkey_deinit(gnutls_pubkey_t key) {}
static void gnutls_privkey_deinit(gnutls_privkey_t key) {}
#endif
static int net_have_pubkey(void) {
#ifdef HAVE_FUN_gnutls_pubkey_encrypt_data
return 1;
#else
return 0;
#endif
}
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