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#include "hiredis.h"
#include "sslio.h"
#include <assert.h>
#ifdef HIREDIS_SSL
#include <pthread.h>
#include <errno.h>
void __redisSetError(redisContext *c, int type, const char *str);
/**
* Callback used for debugging
*/
static void sslLogCallback(const SSL *ssl, int where, int ret) {
const char *retstr = "";
int should_log = 1;
/* Ignore low-level SSL stuff */
if (where & SSL_CB_ALERT) {
should_log = 1;
}
if (where == SSL_CB_HANDSHAKE_START || where == SSL_CB_HANDSHAKE_DONE) {
should_log = 1;
}
if ((where & SSL_CB_EXIT) && ret == 0) {
should_log = 1;
}
if (!should_log) {
return;
}
retstr = SSL_alert_type_string(ret);
printf("ST(0x%x). %s. R(0x%x)%s\n", where, SSL_state_string_long(ssl), ret, retstr);
if (where == SSL_CB_HANDSHAKE_DONE) {
printf("Using SSL version %s. Cipher=%s\n", SSL_get_version(ssl), SSL_get_cipher_name(ssl));
}
}
typedef pthread_mutex_t sslLockType;
static void sslLockInit(sslLockType *l) {
pthread_mutex_init(l, NULL);
}
static void sslLockAcquire(sslLockType *l) {
pthread_mutex_lock(l);
}
static void sslLockRelease(sslLockType *l) {
pthread_mutex_unlock(l);
}
static pthread_mutex_t *ossl_locks;
static void opensslDoLock(int mode, int lkid, const char *f, int line) {
sslLockType *l = ossl_locks + lkid;
if (mode & CRYPTO_LOCK) {
sslLockAcquire(l);
} else {
sslLockRelease(l);
}
(void)f;
(void)line;
}
static void initOpensslLocks(void) {
unsigned ii, nlocks;
if (CRYPTO_get_locking_callback() != NULL) {
/* Someone already set the callback before us. Don't destroy it! */
return;
}
nlocks = CRYPTO_num_locks();
ossl_locks = malloc(sizeof(*ossl_locks) * nlocks);
for (ii = 0; ii < nlocks; ii++) {
sslLockInit(ossl_locks + ii);
}
CRYPTO_set_locking_callback(opensslDoLock);
}
void redisFreeSsl(redisSsl *ssl){
if (ssl->ctx) {
SSL_CTX_free(ssl->ctx);
}
if (ssl->ssl) {
SSL_free(ssl->ssl);
}
free(ssl);
}
int redisSslCreate(redisContext *c, const char *capath, const char *certpath,
const char *keypath, const char *servername) {
assert(!c->ssl);
c->ssl = calloc(1, sizeof(*c->ssl));
static int isInit = 0;
if (!isInit) {
isInit = 1;
SSL_library_init();
initOpensslLocks();
}
redisSsl *s = c->ssl;
s->ctx = SSL_CTX_new(SSLv23_client_method());
SSL_CTX_set_info_callback(s->ctx, sslLogCallback);
SSL_CTX_set_mode(s->ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
SSL_CTX_set_options(s->ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
SSL_CTX_set_verify(s->ctx, SSL_VERIFY_PEER, NULL);
if ((certpath != NULL && keypath == NULL) || (keypath != NULL && certpath == NULL)) {
__redisSetError(c, REDIS_ERR, "certpath and keypath must be specified together");
return REDIS_ERR;
}
if (capath) {
if (!SSL_CTX_load_verify_locations(s->ctx, capath, NULL)) {
__redisSetError(c, REDIS_ERR, "Invalid CA certificate");
return REDIS_ERR;
}
}
if (certpath) {
if (!SSL_CTX_use_certificate_chain_file(s->ctx, certpath)) {
__redisSetError(c, REDIS_ERR, "Invalid client certificate");
return REDIS_ERR;
}
if (!SSL_CTX_use_PrivateKey_file(s->ctx, keypath, SSL_FILETYPE_PEM)) {
__redisSetError(c, REDIS_ERR, "Invalid client key");
return REDIS_ERR;
}
}
s->ssl = SSL_new(s->ctx);
if (!s->ssl) {
__redisSetError(c, REDIS_ERR, "Couldn't create new SSL instance");
return REDIS_ERR;
}
if (servername) {
if (!SSL_set_tlsext_host_name(s->ssl, servername)) {
__redisSetError(c, REDIS_ERR, "Couldn't set server name indication");
return REDIS_ERR;
}
}
SSL_set_fd(s->ssl, c->fd);
SSL_set_connect_state(s->ssl);
c->flags |= REDIS_SSL;
int rv = SSL_connect(c->ssl->ssl);
if (rv == 1) {
return REDIS_OK;
}
rv = SSL_get_error(s->ssl, rv);
if (((c->flags & REDIS_BLOCK) == 0) &&
(rv == SSL_ERROR_WANT_READ || rv == SSL_ERROR_WANT_WRITE)) {
return REDIS_OK;
}
if (c->err == 0) {
__redisSetError(c, REDIS_ERR_IO, "SSL_connect() failed");
}
return REDIS_ERR;
}
static int maybeCheckWant(redisSsl *rssl, int rv) {
/**
* If the error is WANT_READ or WANT_WRITE, the appropriate flags are set
* and true is returned. False is returned otherwise
*/
if (rv == SSL_ERROR_WANT_READ) {
rssl->wantRead = 1;
return 1;
} else if (rv == SSL_ERROR_WANT_WRITE) {
rssl->pendingWrite = 1;
return 1;
} else {
return 0;
}
}
int redisSslRead(redisContext *c, char *buf, size_t bufcap) {
int nread = SSL_read(c->ssl->ssl, buf, bufcap);
if (nread > 0) {
return nread;
} else if (nread == 0) {
__redisSetError(c, REDIS_ERR_EOF, "Server closed the connection");
return -1;
} else {
int err = SSL_get_error(c->ssl->ssl, nread);
if (c->flags & REDIS_BLOCK) {
/**
* In blocking mode, we should never end up in a situation where
* we get an error without it being an actual error, except
* in the case of EINTR, which can be spuriously received from
* debuggers or whatever.
*/
if (errno == EINTR) {
return 0;
} else {
const char *msg = NULL;
if (errno == EAGAIN) {
msg = "Timed out";
}
__redisSetError(c, REDIS_ERR_IO, msg);
return -1;
}
}
/**
* We can very well get an EWOULDBLOCK/EAGAIN, however
*/
if (maybeCheckWant(c->ssl, err)) {
return 0;
} else {
__redisSetError(c, REDIS_ERR_IO, NULL);
return -1;
}
}
}
int redisSslWrite(redisContext *c) {
size_t len = c->ssl->lastLen ? c->ssl->lastLen : sdslen(c->obuf);
int rv = SSL_write(c->ssl->ssl, c->obuf, len);
if (rv > 0) {
c->ssl->lastLen = 0;
} else if (rv < 0) {
c->ssl->lastLen = len;
int err = SSL_get_error(c->ssl->ssl, rv);
if ((c->flags & REDIS_BLOCK) == 0 && maybeCheckWant(c->ssl, err)) {
return 0;
} else {
__redisSetError(c, REDIS_ERR_IO, NULL);
return -1;
}
}
return rv;
}
#endif
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