pineapple/externals/libressl/tls/tls_config.c

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2022-04-24 22:29:35 +02:00
/* $OpenBSD: tls_config.c,v 1.65 2022/01/25 21:51:24 eric Exp $ */
2020-12-28 16:15:37 +01:00
/*
* Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/stat.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <tls.h>
#include "tls_internal.h"
static const char default_ca_file[] = TLS_DEFAULT_CA_FILE;
const char *
tls_default_ca_cert_file(void)
{
return default_ca_file;
}
int
tls_config_load_file(struct tls_error *error, const char *filetype,
const char *filename, char **buf, size_t *len)
{
struct stat st;
int fd = -1;
ssize_t n;
free(*buf);
*buf = NULL;
*len = 0;
if ((fd = open(filename, O_RDONLY)) == -1) {
tls_error_set(error, "failed to open %s file '%s'",
filetype, filename);
goto err;
}
if (fstat(fd, &st) != 0) {
tls_error_set(error, "failed to stat %s file '%s'",
filetype, filename);
goto err;
}
if (st.st_size < 0)
goto err;
*len = (size_t)st.st_size;
if ((*buf = malloc(*len)) == NULL) {
tls_error_set(error, "failed to allocate buffer for "
"%s file", filetype);
goto err;
}
n = read(fd, *buf, *len);
if (n < 0 || (size_t)n != *len) {
tls_error_set(error, "failed to read %s file '%s'",
filetype, filename);
goto err;
}
close(fd);
return 0;
err:
if (fd != -1)
close(fd);
freezero(*buf, *len);
*buf = NULL;
*len = 0;
return -1;
}
struct tls_config *
tls_config_new_internal(void)
{
struct tls_config *config;
unsigned char sid[TLS_MAX_SESSION_ID_LENGTH];
if ((config = calloc(1, sizeof(*config))) == NULL)
return (NULL);
if (pthread_mutex_init(&config->mutex, NULL) != 0)
goto err;
config->refcount = 1;
config->session_fd = -1;
if ((config->keypair = tls_keypair_new()) == NULL)
goto err;
/*
* Default configuration.
*/
if (tls_config_set_dheparams(config, "none") != 0)
goto err;
if (tls_config_set_ecdhecurves(config, "default") != 0)
goto err;
if (tls_config_set_ciphers(config, "secure") != 0)
goto err;
if (tls_config_set_protocols(config, TLS_PROTOCOLS_DEFAULT) != 0)
goto err;
if (tls_config_set_verify_depth(config, 6) != 0)
goto err;
/*
* Set session ID context to a random value. For the simple case
* of a single process server this is good enough. For multiprocess
* servers the session ID needs to be set by the caller.
*/
arc4random_buf(sid, sizeof(sid));
if (tls_config_set_session_id(config, sid, sizeof(sid)) != 0)
goto err;
config->ticket_keyrev = arc4random();
config->ticket_autorekey = 1;
tls_config_prefer_ciphers_server(config);
tls_config_verify(config);
return (config);
err:
tls_config_free(config);
return (NULL);
}
struct tls_config *
tls_config_new(void)
{
if (tls_init() == -1)
return (NULL);
return tls_config_new_internal();
}
void
tls_config_free(struct tls_config *config)
{
struct tls_keypair *kp, *nkp;
int refcount;
if (config == NULL)
return;
pthread_mutex_lock(&config->mutex);
refcount = --config->refcount;
pthread_mutex_unlock(&config->mutex);
if (refcount > 0)
return;
for (kp = config->keypair; kp != NULL; kp = nkp) {
nkp = kp->next;
tls_keypair_free(kp);
}
free(config->error.msg);
free(config->alpn);
free((char *)config->ca_mem);
free((char *)config->ca_path);
free((char *)config->ciphers);
free((char *)config->crl_mem);
free(config->ecdhecurves);
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pthread_mutex_destroy(&config->mutex);
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free(config);
}
static void
tls_config_keypair_add(struct tls_config *config, struct tls_keypair *keypair)
{
struct tls_keypair *kp;
kp = config->keypair;
while (kp->next != NULL)
kp = kp->next;
kp->next = keypair;
}
const char *
tls_config_error(struct tls_config *config)
{
return config->error.msg;
}
void
tls_config_clear_keys(struct tls_config *config)
{
struct tls_keypair *kp;
for (kp = config->keypair; kp != NULL; kp = kp->next)
tls_keypair_clear_key(kp);
}
int
tls_config_parse_protocols(uint32_t *protocols, const char *protostr)
{
uint32_t proto, protos = 0;
char *s, *p, *q;
int negate;
if (protostr == NULL) {
*protocols = TLS_PROTOCOLS_DEFAULT;
return (0);
}
if ((s = strdup(protostr)) == NULL)
return (-1);
q = s;
while ((p = strsep(&q, ",:")) != NULL) {
while (*p == ' ' || *p == '\t')
p++;
negate = 0;
if (*p == '!') {
negate = 1;
p++;
}
if (negate && protos == 0)
protos = TLS_PROTOCOLS_ALL;
proto = 0;
if (strcasecmp(p, "all") == 0 ||
strcasecmp(p, "legacy") == 0)
proto = TLS_PROTOCOLS_ALL;
else if (strcasecmp(p, "default") == 0 ||
strcasecmp(p, "secure") == 0)
proto = TLS_PROTOCOLS_DEFAULT;
if (strcasecmp(p, "tlsv1") == 0)
proto = TLS_PROTOCOL_TLSv1;
else if (strcasecmp(p, "tlsv1.0") == 0)
proto = TLS_PROTOCOL_TLSv1_0;
else if (strcasecmp(p, "tlsv1.1") == 0)
proto = TLS_PROTOCOL_TLSv1_1;
else if (strcasecmp(p, "tlsv1.2") == 0)
proto = TLS_PROTOCOL_TLSv1_2;
else if (strcasecmp(p, "tlsv1.3") == 0)
proto = TLS_PROTOCOL_TLSv1_3;
if (proto == 0) {
free(s);
return (-1);
}
if (negate)
protos &= ~proto;
else
protos |= proto;
}
*protocols = protos;
free(s);
return (0);
}
static int
tls_config_parse_alpn(struct tls_config *config, const char *alpn,
char **alpn_data, size_t *alpn_len)
{
size_t buf_len, i, len;
char *buf = NULL;
char *s = NULL;
char *p, *q;
free(*alpn_data);
*alpn_data = NULL;
*alpn_len = 0;
if ((buf_len = strlen(alpn) + 1) > 65535) {
tls_config_set_errorx(config, "alpn too large");
goto err;
}
if ((buf = malloc(buf_len)) == NULL) {
tls_config_set_errorx(config, "out of memory");
goto err;
}
if ((s = strdup(alpn)) == NULL) {
tls_config_set_errorx(config, "out of memory");
goto err;
}
i = 0;
q = s;
while ((p = strsep(&q, ",")) != NULL) {
if ((len = strlen(p)) == 0) {
tls_config_set_errorx(config,
"alpn protocol with zero length");
goto err;
}
if (len > 255) {
tls_config_set_errorx(config,
"alpn protocol too long");
goto err;
}
buf[i++] = len & 0xff;
memcpy(&buf[i], p, len);
i += len;
}
free(s);
*alpn_data = buf;
*alpn_len = buf_len;
return (0);
err:
free(buf);
free(s);
return (-1);
}
int
tls_config_set_alpn(struct tls_config *config, const char *alpn)
{
return tls_config_parse_alpn(config, alpn, &config->alpn,
&config->alpn_len);
}
static int
tls_config_add_keypair_file_internal(struct tls_config *config,
const char *cert_file, const char *key_file, const char *ocsp_file)
{
struct tls_keypair *keypair;
if ((keypair = tls_keypair_new()) == NULL)
return (-1);
if (tls_keypair_set_cert_file(keypair, &config->error, cert_file) != 0)
goto err;
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if (key_file != NULL &&
tls_keypair_set_key_file(keypair, &config->error, key_file) != 0)
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goto err;
if (ocsp_file != NULL &&
tls_keypair_set_ocsp_staple_file(keypair, &config->error,
ocsp_file) != 0)
goto err;
tls_config_keypair_add(config, keypair);
return (0);
err:
tls_keypair_free(keypair);
return (-1);
}
static int
tls_config_add_keypair_mem_internal(struct tls_config *config, const uint8_t *cert,
size_t cert_len, const uint8_t *key, size_t key_len,
const uint8_t *staple, size_t staple_len)
{
struct tls_keypair *keypair;
if ((keypair = tls_keypair_new()) == NULL)
return (-1);
if (tls_keypair_set_cert_mem(keypair, &config->error, cert, cert_len) != 0)
goto err;
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if (key != NULL &&
tls_keypair_set_key_mem(keypair, &config->error, key, key_len) != 0)
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goto err;
if (staple != NULL &&
tls_keypair_set_ocsp_staple_mem(keypair, &config->error, staple,
staple_len) != 0)
goto err;
tls_config_keypair_add(config, keypair);
return (0);
err:
tls_keypair_free(keypair);
return (-1);
}
int
tls_config_add_keypair_mem(struct tls_config *config, const uint8_t *cert,
size_t cert_len, const uint8_t *key, size_t key_len)
{
return tls_config_add_keypair_mem_internal(config, cert, cert_len, key,
key_len, NULL, 0);
}
int
tls_config_add_keypair_file(struct tls_config *config,
const char *cert_file, const char *key_file)
{
return tls_config_add_keypair_file_internal(config, cert_file,
key_file, NULL);
}
int
tls_config_add_keypair_ocsp_mem(struct tls_config *config, const uint8_t *cert,
size_t cert_len, const uint8_t *key, size_t key_len, const uint8_t *staple,
size_t staple_len)
{
return tls_config_add_keypair_mem_internal(config, cert, cert_len, key,
key_len, staple, staple_len);
}
int
tls_config_add_keypair_ocsp_file(struct tls_config *config,
const char *cert_file, const char *key_file, const char *ocsp_file)
{
return tls_config_add_keypair_file_internal(config, cert_file,
key_file, ocsp_file);
}
int
tls_config_set_ca_file(struct tls_config *config, const char *ca_file)
{
return tls_config_load_file(&config->error, "CA", ca_file,
&config->ca_mem, &config->ca_len);
}
int
tls_config_set_ca_path(struct tls_config *config, const char *ca_path)
{
return tls_set_string(&config->ca_path, ca_path);
}
int
tls_config_set_ca_mem(struct tls_config *config, const uint8_t *ca, size_t len)
{
return tls_set_mem(&config->ca_mem, &config->ca_len, ca, len);
}
int
tls_config_set_cert_file(struct tls_config *config, const char *cert_file)
{
return tls_keypair_set_cert_file(config->keypair, &config->error,
cert_file);
}
int
tls_config_set_cert_mem(struct tls_config *config, const uint8_t *cert,
size_t len)
{
return tls_keypair_set_cert_mem(config->keypair, &config->error,
cert, len);
}
int
tls_config_set_ciphers(struct tls_config *config, const char *ciphers)
{
SSL_CTX *ssl_ctx = NULL;
if (ciphers == NULL ||
strcasecmp(ciphers, "default") == 0 ||
strcasecmp(ciphers, "secure") == 0)
ciphers = TLS_CIPHERS_DEFAULT;
else if (strcasecmp(ciphers, "compat") == 0)
ciphers = TLS_CIPHERS_COMPAT;
else if (strcasecmp(ciphers, "legacy") == 0)
ciphers = TLS_CIPHERS_LEGACY;
else if (strcasecmp(ciphers, "all") == 0 ||
strcasecmp(ciphers, "insecure") == 0)
ciphers = TLS_CIPHERS_ALL;
if ((ssl_ctx = SSL_CTX_new(SSLv23_method())) == NULL) {
tls_config_set_errorx(config, "out of memory");
goto err;
}
if (SSL_CTX_set_cipher_list(ssl_ctx, ciphers) != 1) {
tls_config_set_errorx(config, "no ciphers for '%s'", ciphers);
goto err;
}
SSL_CTX_free(ssl_ctx);
return tls_set_string(&config->ciphers, ciphers);
err:
SSL_CTX_free(ssl_ctx);
return -1;
}
int
tls_config_set_crl_file(struct tls_config *config, const char *crl_file)
{
return tls_config_load_file(&config->error, "CRL", crl_file,
&config->crl_mem, &config->crl_len);
}
int
tls_config_set_crl_mem(struct tls_config *config, const uint8_t *crl,
size_t len)
{
return tls_set_mem(&config->crl_mem, &config->crl_len, crl, len);
}
int
tls_config_set_dheparams(struct tls_config *config, const char *params)
{
int keylen;
if (params == NULL || strcasecmp(params, "none") == 0)
keylen = 0;
else if (strcasecmp(params, "auto") == 0)
keylen = -1;
else if (strcasecmp(params, "legacy") == 0)
keylen = 1024;
else {
tls_config_set_errorx(config, "invalid dhe param '%s'", params);
return (-1);
}
config->dheparams = keylen;
return (0);
}
int
tls_config_set_ecdhecurve(struct tls_config *config, const char *curve)
{
if (curve == NULL ||
strcasecmp(curve, "none") == 0 ||
strcasecmp(curve, "auto") == 0) {
curve = TLS_ECDHE_CURVES;
} else if (strchr(curve, ',') != NULL || strchr(curve, ':') != NULL) {
tls_config_set_errorx(config, "invalid ecdhe curve '%s'",
curve);
return (-1);
}
return tls_config_set_ecdhecurves(config, curve);
}
int
tls_config_set_ecdhecurves(struct tls_config *config, const char *curves)
{
int *curves_list = NULL, *curves_new;
size_t curves_num = 0;
char *cs = NULL;
char *p, *q;
int rv = -1;
int nid;
free(config->ecdhecurves);
config->ecdhecurves = NULL;
config->ecdhecurves_len = 0;
if (curves == NULL || strcasecmp(curves, "default") == 0)
curves = TLS_ECDHE_CURVES;
if ((cs = strdup(curves)) == NULL) {
tls_config_set_errorx(config, "out of memory");
goto err;
}
q = cs;
while ((p = strsep(&q, ",:")) != NULL) {
while (*p == ' ' || *p == '\t')
p++;
nid = OBJ_sn2nid(p);
if (nid == NID_undef)
nid = OBJ_ln2nid(p);
if (nid == NID_undef)
nid = EC_curve_nist2nid(p);
if (nid == NID_undef) {
tls_config_set_errorx(config,
"invalid ecdhe curve '%s'", p);
goto err;
}
if ((curves_new = reallocarray(curves_list, curves_num + 1,
sizeof(int))) == NULL) {
tls_config_set_errorx(config, "out of memory");
goto err;
}
curves_list = curves_new;
curves_list[curves_num] = nid;
curves_num++;
}
config->ecdhecurves = curves_list;
config->ecdhecurves_len = curves_num;
curves_list = NULL;
rv = 0;
err:
free(cs);
free(curves_list);
return (rv);
}
int
tls_config_set_key_file(struct tls_config *config, const char *key_file)
{
return tls_keypair_set_key_file(config->keypair, &config->error,
key_file);
}
int
tls_config_set_key_mem(struct tls_config *config, const uint8_t *key,
size_t len)
{
return tls_keypair_set_key_mem(config->keypair, &config->error,
key, len);
}
static int
tls_config_set_keypair_file_internal(struct tls_config *config,
const char *cert_file, const char *key_file, const char *ocsp_file)
{
if (tls_config_set_cert_file(config, cert_file) != 0)
return (-1);
if (tls_config_set_key_file(config, key_file) != 0)
return (-1);
if (ocsp_file != NULL &&
tls_config_set_ocsp_staple_file(config, ocsp_file) != 0)
return (-1);
return (0);
}
static int
tls_config_set_keypair_mem_internal(struct tls_config *config, const uint8_t *cert,
size_t cert_len, const uint8_t *key, size_t key_len,
const uint8_t *staple, size_t staple_len)
{
if (tls_config_set_cert_mem(config, cert, cert_len) != 0)
return (-1);
if (tls_config_set_key_mem(config, key, key_len) != 0)
return (-1);
if ((staple != NULL) &&
(tls_config_set_ocsp_staple_mem(config, staple, staple_len) != 0))
return (-1);
return (0);
}
int
tls_config_set_keypair_file(struct tls_config *config,
const char *cert_file, const char *key_file)
{
return tls_config_set_keypair_file_internal(config, cert_file, key_file,
NULL);
}
int
tls_config_set_keypair_mem(struct tls_config *config, const uint8_t *cert,
size_t cert_len, const uint8_t *key, size_t key_len)
{
return tls_config_set_keypair_mem_internal(config, cert, cert_len,
key, key_len, NULL, 0);
}
int
tls_config_set_keypair_ocsp_file(struct tls_config *config,
const char *cert_file, const char *key_file, const char *ocsp_file)
{
return tls_config_set_keypair_file_internal(config, cert_file, key_file,
ocsp_file);
}
int
tls_config_set_keypair_ocsp_mem(struct tls_config *config, const uint8_t *cert,
size_t cert_len, const uint8_t *key, size_t key_len,
const uint8_t *staple, size_t staple_len)
{
return tls_config_set_keypair_mem_internal(config, cert, cert_len,
key, key_len, staple, staple_len);
}
int
tls_config_set_protocols(struct tls_config *config, uint32_t protocols)
{
config->protocols = protocols;
return (0);
}
int
tls_config_set_session_fd(struct tls_config *config, int session_fd)
{
struct stat sb;
mode_t mugo;
if (session_fd == -1) {
config->session_fd = session_fd;
return (0);
}
if (fstat(session_fd, &sb) == -1) {
tls_config_set_error(config, "failed to stat session file");
return (-1);
}
if (!S_ISREG(sb.st_mode)) {
tls_config_set_errorx(config,
"session file is not a regular file");
return (-1);
}
if (sb.st_uid != getuid()) {
tls_config_set_errorx(config, "session file has incorrect "
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"owner (uid %u != %u)", sb.st_uid, getuid());
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return (-1);
}
mugo = sb.st_mode & (S_IRWXU|S_IRWXG|S_IRWXO);
if (mugo != (S_IRUSR|S_IWUSR)) {
tls_config_set_errorx(config, "session file has incorrect "
"permissions (%o != 600)", mugo);
return (-1);
}
config->session_fd = session_fd;
return (0);
}
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int
tls_config_set_sign_cb(struct tls_config *config, tls_sign_cb cb, void *cb_arg)
{
config->use_fake_private_key = 1;
config->skip_private_key_check = 1;
config->sign_cb = cb;
config->sign_cb_arg = cb_arg;
return (0);
}
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int
tls_config_set_verify_depth(struct tls_config *config, int verify_depth)
{
config->verify_depth = verify_depth;
return (0);
}
void
tls_config_prefer_ciphers_client(struct tls_config *config)
{
config->ciphers_server = 0;
}
void
tls_config_prefer_ciphers_server(struct tls_config *config)
{
config->ciphers_server = 1;
}
void
tls_config_insecure_noverifycert(struct tls_config *config)
{
config->verify_cert = 0;
}
void
tls_config_insecure_noverifyname(struct tls_config *config)
{
config->verify_name = 0;
}
void
tls_config_insecure_noverifytime(struct tls_config *config)
{
config->verify_time = 0;
}
void
tls_config_verify(struct tls_config *config)
{
config->verify_cert = 1;
config->verify_name = 1;
config->verify_time = 1;
}
void
tls_config_ocsp_require_stapling(struct tls_config *config)
{
config->ocsp_require_stapling = 1;
}
void
tls_config_verify_client(struct tls_config *config)
{
config->verify_client = 1;
}
void
tls_config_verify_client_optional(struct tls_config *config)
{
config->verify_client = 2;
}
void
tls_config_skip_private_key_check(struct tls_config *config)
{
config->skip_private_key_check = 1;
}
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void
tls_config_use_fake_private_key(struct tls_config *config)
{
config->use_fake_private_key = 1;
config->skip_private_key_check = 1;
}
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int
tls_config_set_ocsp_staple_file(struct tls_config *config, const char *staple_file)
{
return tls_keypair_set_ocsp_staple_file(config->keypair, &config->error,
staple_file);
}
int
tls_config_set_ocsp_staple_mem(struct tls_config *config, const uint8_t *staple,
size_t len)
{
return tls_keypair_set_ocsp_staple_mem(config->keypair, &config->error,
staple, len);
}
int
tls_config_set_session_id(struct tls_config *config,
const unsigned char *session_id, size_t len)
{
if (len > TLS_MAX_SESSION_ID_LENGTH) {
tls_config_set_errorx(config, "session ID too large");
return (-1);
}
memset(config->session_id, 0, sizeof(config->session_id));
memcpy(config->session_id, session_id, len);
return (0);
}
int
tls_config_set_session_lifetime(struct tls_config *config, int lifetime)
{
if (lifetime > TLS_MAX_SESSION_TIMEOUT) {
tls_config_set_errorx(config, "session lifetime too large");
return (-1);
}
if (lifetime != 0 && lifetime < TLS_MIN_SESSION_TIMEOUT) {
tls_config_set_errorx(config, "session lifetime too small");
return (-1);
}
config->session_lifetime = lifetime;
return (0);
}
int
tls_config_add_ticket_key(struct tls_config *config, uint32_t keyrev,
unsigned char *key, size_t keylen)
{
struct tls_ticket_key newkey;
int i;
if (TLS_TICKET_KEY_SIZE != keylen ||
sizeof(newkey.aes_key) + sizeof(newkey.hmac_key) > keylen) {
tls_config_set_errorx(config,
"wrong amount of ticket key data");
return (-1);
}
keyrev = htonl(keyrev);
memset(&newkey, 0, sizeof(newkey));
memcpy(newkey.key_name, &keyrev, sizeof(keyrev));
memcpy(newkey.aes_key, key, sizeof(newkey.aes_key));
memcpy(newkey.hmac_key, key + sizeof(newkey.aes_key),
sizeof(newkey.hmac_key));
newkey.time = time(NULL);
for (i = 0; i < TLS_NUM_TICKETS; i++) {
struct tls_ticket_key *tk = &config->ticket_keys[i];
if (memcmp(newkey.key_name, tk->key_name,
sizeof(tk->key_name)) != 0)
continue;
/* allow re-entry of most recent key */
if (i == 0 && memcmp(newkey.aes_key, tk->aes_key,
sizeof(tk->aes_key)) == 0 && memcmp(newkey.hmac_key,
tk->hmac_key, sizeof(tk->hmac_key)) == 0)
return (0);
tls_config_set_errorx(config, "ticket key already present");
return (-1);
}
memmove(&config->ticket_keys[1], &config->ticket_keys[0],
sizeof(config->ticket_keys) - sizeof(config->ticket_keys[0]));
config->ticket_keys[0] = newkey;
config->ticket_autorekey = 0;
return (0);
}
int
tls_config_ticket_autorekey(struct tls_config *config)
{
unsigned char key[TLS_TICKET_KEY_SIZE];
int rv;
arc4random_buf(key, sizeof(key));
rv = tls_config_add_ticket_key(config, config->ticket_keyrev++, key,
sizeof(key));
config->ticket_autorekey = 1;
return (rv);
}