X509_STORE_CTX_NEW(3)

NAME
X509_STORE_CTX_new, X509_STORE_CTX_cleanup, X509_STORE_CTX_free, X509_STORE_CTX_init, X509_STORE_CTX_get0_store, X509_STORE_CTX_set0_trusted_stack, X509_STORE_CTX_trusted_stack, X509_STORE_CTX_set_cert, X509_STORE_CTX_set_chain, X509_STORE_CTX_set0_crls, X509_STORE_CTX_get0_param, X509_STORE_CTX_set0_param, X509_STORE_CTX_get0_untrusted, X509_STORE_CTX_set0_untrusted, X509_STORE_CTX_set_default - X509_STORE_CTX initialisation

SYNOPSIS
#include <openssl/x509_vfy.h>
X509_STORE_CTX *
X509_STORE_CTX_new(void);
void
X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx);
void
X509_STORE_CTX_free(X509_STORE_CTX *ctx);
int
X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store, X509 *x509, STACK_OF(X509) *chain);
X509_STORE *
X509_STORE_CTX_get0_store(X509_STORE_CTX *ctx);
void
X509_STORE_CTX_set0_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk);
void
X509_STORE_CTX_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk);
void
X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x);
void
X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk);
void
X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk);
X509_VERIFY_PARAM *
X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx);
void
X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param);
int
X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name);
STACK_OF(X509)*
X509_STORE_CTX_get0_untrusted(X509_STORE_CTX *ctx);
void
X509_STORE_CTX_set0_untrusted(X509_STORE_CTX *ctx, STACK_OF(X509) *sk);

DESCRIPTION
These functions initialise an X509_STORE_CTX structure for subsequent use by X509_verify_cert(3).

X509_STORE_CTX_new() returns a newly initialised X509_STORE_CTX structure.

X509_STORE_CTX_cleanup() internally cleans up an X509_STORE_CTX structure. The context can then be reused with a new call to X509_STORE_CTX_init().

X509_STORE_CTX_free() completely frees up ctx. After this call ctx is no longer valid. If ctx is a NULL pointer, no action occurs.

X509_STORE_CTX_init() sets up ctx for a subsequent verification operation. The trusted certificate store is set to store, the end entity certificate to be verified is set to x509 and a set of additional certificates (which will be untrusted but may be used to build the chain) in chain. Any or all of the store, x509, and chain parameters can be NULL.

X509_STORE_CTX_get0_store() returns an internal pointer to the trusted certificate store that was set with X509_STORE_CTX_init().

X509_STORE_CTX_set0_trusted_stack() sets the set of trusted certificates of ctx to sk. This is an alternative way of specifying trusted certificates instead of using an X509_STORE. X509_STORE_CTX_trusted_stack() is a deprecated alias for X509_STORE_CTX_set0_trusted_stack().

X509_STORE_CTX_set_cert() sets the certificate to be verified in ctx to x.

X509_STORE_CTX_set_chain() sets the additional certificate chain used by ctx to sk.

X509_STORE_CTX_set0_crls() sets a set of CRLs to use to aid certificate verification to sk. These CRLs will only be used if CRL verification is enabled in the associated X509_VERIFY_PARAM structure. This might be used where additional "useful" CRLs are supplied as part of a protocol, for example in a PKCS#7 structure.

X509_STORE_CTX_get0_param() retrieves an internal pointer to the verification parameters associated with ctx.

X509_STORE_CTX_set0_param() sets the internal verification parameter pointer to param. After this call param should not be used.

X509_STORE_CTX_set_default() looks up and sets the default verification method to name. This uses the function X509_VERIFY_PARAM_lookup(3) to find an appropriate set of parameters from name.

X509_STORE_CTX_get0_untrusted() retrieves an internal pointer to the stack of untrusted certificates associated with ctx.

X509_STORE_CTX_set0_untrusted() sets the internal pointer to the stack of untrusted certificates associated with ctx to sk.

The certificates and CRLs in a store are used internally and should not be freed up until after the associated X509_STORE_CTX is freed. Legacy applications might implicitly use an X509_STORE_CTX like this:

    X509_STORE_CTX ctx;
    X509_STORE_CTX_init(&ctx, store, cert, chain);

This is not recommended in new applications. They should instead do:

    X509_STORE_CTX *ctx;
    ctx = X509_STORE_CTX_new();
    if (ctx == NULL)
    	/* Bad error */
    X509_STORE_CTX_init(ctx, store, cert, chain);

RETURN VALUES
X509_STORE_CTX_new() returns a newly allocated context or NULL if an error occurred.

X509_STORE_CTX_init() returns 1 for success or 0 if an error occurred.

X509_STORE_CTX_get0_store() returns a pointer to the trusted certificate store or NULL if ctx was not initialised.

X509_STORE_CTX_get0_param() returns a pointer to an X509_VERIFY_PARAM structure or NULL if an error occurred.

X509_STORE_CTX_set_default() returns 1 for success or 0 if an error occurred.

X509_STORE_CTX_get0_untrusted() returns an internal pointer.

SEE ALSO
X509_STORE_CTX_get_error(3), X509_STORE_new(3), X509_STORE_set1_param(3), X509_verify_cert(3), X509_VERIFY_PARAM_set_flags(3)

HISTORY
X509_STORE_CTX_cleanup(), X509_STORE_CTX_init(), X509_STORE_CTX_set_cert(), and X509_STORE_CTX_set_chain() appeared before SSLeay 0.8 and have been available since OpenBSD 2.4.

X509_STORE_CTX_new() and X509_STORE_CTX_free() first appeared in OpenSSL 0.9.5 and have been available since OpenBSD 2.7.

X509_STORE_CTX_trusted_stack() first appeared in OpenSSL 0.9.6 and has been available since OpenBSD 2.9.

X509_STORE_CTX_set0_crls(), X509_STORE_CTX_get0_param(), X509_STORE_CTX_set0_param(), and X509_STORE_CTX_set_default() first appeared in OpenSSL 0.9.8 and have been available since OpenBSD 4.5.

X509_STORE_CTX_get0_store() first appeared in OpenSSL 1.0.2. X509_STORE_CTX_set0_trusted_stack(), X509_STORE_CTX_get0_untrusted(), and X509_STORE_CTX_set0_untrusted() first appeared in OpenSSL 1.1.0. These functions have been available since OpenBSD 6.3.

BUGS
The certificates and CRLs in a context are used internally and should not be freed up until after the associated X509_STORE_CTX is freed. Copies should be made or reference counts increased instead.