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NAMESSL_get_ex_data_X509_STORE_CTX_idx, SSL_CTX_set_verify, SSL_set_verify, SSL_CTX_set_verify_depth, SSL_set_verify_depth, SSL_verify_cb, SSL_verify_client_post_handshake, SSL_set_post_handshake_auth, SSL_CTX_set_post_handshake_auth - set peer certificate verification parameters
SYNOPSIS#include <openssl/ssl.h> typedef int (*SSL_verify_cb)(int preverify_ok, X509_STORE_CTX *x509_ctx); void SSL_CTX_set_verify(SSL_CTX *ctx, int mode, SSL_verify_cb verify_callback); void SSL_set_verify(SSL *ssl, int mode, SSL_verify_cb verify_callback); SSL_get_ex_data_X509_STORE_CTX_idx(void); void SSL_CTX_set_verify_depth(SSL_CTX *ctx, int depth); void SSL_set_verify_depth(SSL *ssl, int depth); int SSL_verify_client_post_handshake(SSL *ssl); void SSL_CTX_set_post_handshake_auth(SSL_CTX *ctx, int val); void SSL_set_post_handshake_auth(SSL *ssl, int val);
DESCRIPTION
NOTESThe verification of certificates can be controlled by a set of logically or'ed mode flags:
If the mode is SSL_VERIFY_NONE none of the other flags may be set. The actual verification procedure is performed either using the built-in
verification procedure or using another application provided verification
function set with
SSL_CTX_set_cert_verify_callback(3).
The following descriptions apply in the case of the built-in procedure. An
application provided procedure also has access to the verify depth information
and the
The verify_callback function is used to control the behaviour when the SSL_VERIFY_PEER flag is set. It must be supplied by the application and receives two arguments: preverify_ok indicates, whether the verification of the certificate in question was passed (preverify_ok=1) or not (preverify_ok=0). x509_ctx is a pointer to the complete context used for the certificate chain verification. The certificate chain is checked starting with the deepest nesting level (the root CA certificate) and worked upward to the peer's certificate. At each level signatures and issuer attributes are checked. Whenever a verification error is found, the error number is stored in x509_ctx and verify_callback is called with preverify_ok=0. By applying X509_CTX_store_* functions verify_callback can locate the certificate in question and perform additional steps (see EXAMPLES). If no error is found for a certificate, verify_callback is called with preverify_ok=1 before advancing to the next level. The return value of verify_callback controls the strategy of the further verification process. If verify_callback returns 0, the verification process is immediately stopped with "verification failed" state. If SSL_VERIFY_PEER is set, a verification failure alert is sent to the peer and the TLS/SSL handshake is terminated. If verify_callback returns 1, the verification process is continued. If verify_callback always returns 1, the TLS/SSL handshake will not be terminated with respect to verification failures and the connection will be established. The calling process can however retrieve the error code of the last verification error using SSL_get_verify_result(3) or by maintaining its own error storage managed by verify_callback. If no verify_callback is specified, the default callback will be used. Its return value is identical to preverify_ok, so that any verification failure will lead to a termination of the TLS/SSL handshake with an alert message, if SSL_VERIFY_PEER is set. After calling
When post-handshake authentication occurs, a refreshed NewSessionTicket message is sent to the client.
BUGSIn client mode, it is not checked whether the SSL_VERIFY_PEER flag is set, but whether any flags other than SSL_VERIFY_NONE are set. This can lead to unexpected behaviour if SSL_VERIFY_PEER and other flags are not used as required.
RETURN VALUESThe SSL*_set_verify*() functions do not provide diagnostic information. The
EXAMPLESThe following code sequence realizes an example verify_callback function that will always continue the TLS/SSL handshake regardless of verification failure, if wished. The callback realizes a verification depth limit with more informational output. All verification errors are printed; information about the certificate chain is printed on request. The example is realized for a server that does allow but not require client certificates. The example makes use of the ex_data technique to store application data into/retrieve application data from the SSL structure (see CRYPTO_get_ex_new_index(3), SSL_get_ex_data_X509_STORE_CTX_idx(3)).
...
typedef struct {
int verbose_mode;
int verify_depth;
int always_continue;
} mydata_t;
int mydata_index;
...
static int verify_callback(int preverify_ok, X509_STORE_CTX *ctx)
{
char buf[256];
X509 *err_cert;
int err, depth;
SSL *ssl;
mydata_t *mydata;
err_cert = X509_STORE_CTX_get_current_cert(ctx);
err = X509_STORE_CTX_get_error(ctx);
depth = X509_STORE_CTX_get_error_depth(ctx);
/*
* Retrieve the pointer to the SSL of the connection currently treated
* and the application specific data stored into the SSL object.
*/
ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
mydata = SSL_get_ex_data(ssl, mydata_index);
X509_NAME_oneline(X509_get_subject_name(err_cert), buf, 256);
/*
* Catch a too long certificate chain. The depth limit set using
* SSL_CTX_set_verify_depth() is by purpose set to "limit+1" so
* that whenever the "depth>verify_depth" condition is met, we
* have violated the limit and want to log this error condition.
* We must do it here, because the CHAIN_TOO_LONG error would not
* be found explicitly; only errors introduced by cutting off the
* additional certificates would be logged.
*/
if (depth > mydata->verify_depth) {
preverify_ok = 0;
err = X509_V_ERR_CERT_CHAIN_TOO_LONG;
X509_STORE_CTX_set_error(ctx, err);
}
if (!preverify_ok) {
printf("verify error:num=%d:%s:depth=%d:%s\n", err,
X509_verify_cert_error_string(err), depth, buf);
} else if (mydata->verbose_mode) {
printf("depth=%d:%s\n", depth, buf);
}
/*
* At this point, err contains the last verification error. We can use
* it for something special
*/
if (!preverify_ok && (err == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT)) {
X509_NAME_oneline(X509_get_issuer_name(err_cert), buf, 256);
printf("issuer= %s\n", buf);
}
if (mydata->always_continue)
return 1;
else
return preverify_ok;
}
...
mydata_t mydata; ... mydata_index = SSL_get_ex_new_index(0, "mydata index", NULL, NULL, NULL);
...
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE,
verify_callback);
/* * Let the verify_callback catch the verify_depth error so that we get * an appropriate error in the logfile. */ SSL_CTX_set_verify_depth(verify_depth + 1); /* * Set up the SSL specific data into "mydata" and store it into th SSL * structure. */ mydata.verify_depth = verify_depth; ... SSL_set_ex_data(ssl, mydata_index, &mydata);
...
SSL_accept(ssl); /* check of success left out for clarity */
if (peer = SSL_get_peer_certificate(ssl)) {
if (SSL_get_verify_result(ssl) == X509_V_OK) {
/* The client sent a certificate which verified OK */
}
}
SEE ALSOssl(7), SSL_new(3), SSL_CTX_get_verify_mode(3), SSL_get_verify_result(3), SSL_CTX_load_verify_locations(3), SSL_get_peer_certificate(3), SSL_CTX_set_cert_verify_callback(3), SSL_get_ex_data_X509_STORE_CTX_idx(3), SSL_CTX_set_client_cert_cb(3), CRYPTO_get_ex_new_index(3)
HISTORYThe SSL_VERIFY_POST_HANDSHAKE option, and the
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