mirror of
https://github.com/openssl/openssl.git
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4acda8635e
Reviewed-by: Paul Dale <pauli@openssl.org> (Merged from https://github.com/openssl/openssl/pull/14199)
213 lines
8.8 KiB
Plaintext
213 lines
8.8 KiB
Plaintext
=pod
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=head1 NAME
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X509_STORE_CTX_new_ex, X509_STORE_CTX_new, X509_STORE_CTX_cleanup,
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X509_STORE_CTX_free, X509_STORE_CTX_init, X509_STORE_CTX_set0_trusted_stack,
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X509_STORE_CTX_set_cert, X509_STORE_CTX_set0_crls,
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X509_STORE_CTX_get0_param, X509_STORE_CTX_set0_param,
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X509_STORE_CTX_get0_untrusted, X509_STORE_CTX_set0_untrusted,
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X509_STORE_CTX_get_num_untrusted,
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X509_STORE_CTX_get0_chain, X509_STORE_CTX_set0_verified_chain,
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X509_STORE_CTX_set_default,
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X509_STORE_CTX_set_verify,
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X509_STORE_CTX_verify_fn
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- X509_STORE_CTX initialisation
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=head1 SYNOPSIS
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#include <openssl/x509_vfy.h>
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X509_STORE_CTX *X509_STORE_CTX_new_ex(OSSL_LIB_CTX *libctx, const char *propq);
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X509_STORE_CTX *X509_STORE_CTX_new(void);
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void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx);
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void X509_STORE_CTX_free(X509_STORE_CTX *ctx);
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int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *trust_store,
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X509 *target, STACK_OF(X509) *untrusted);
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void X509_STORE_CTX_set0_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk);
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void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *target);
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void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk);
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X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(const X509_STORE_CTX *ctx);
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void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param);
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STACK_OF(X509)* X509_STORE_CTX_get0_untrusted(const X509_STORE_CTX *ctx);
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void X509_STORE_CTX_set0_untrusted(X509_STORE_CTX *ctx, STACK_OF(X509) *sk);
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int X509_STORE_CTX_get_num_untrusted(const X509_STORE_CTX *ctx);
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STACK_OF(X509) *X509_STORE_CTX_get0_chain(const X509_STORE_CTX *ctx);
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void X509_STORE_CTX_set0_verified_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *chain);
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int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name);
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typedef int (*X509_STORE_CTX_verify_fn)(X509_STORE_CTX *);
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void X509_STORE_CTX_set_verify(X509_STORE_CTX *ctx, X509_STORE_CTX_verify_fn verify);
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=head1 DESCRIPTION
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These functions initialise an B<X509_STORE_CTX> structure for subsequent use
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by L<X509_verify_cert(3)> or L<X509_STORE_CTX_verify(3)>.
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X509_STORE_CTX_new_ex() returns a newly initialised B<X509_STORE_CTX>
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structure associated with the specified library context I<libctx> and property
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query string I<propq>. Any cryptographic algorithms fetched while performing
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processing with the X509_STORE_CTX will use that library context and property
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query string.
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X509_STORE_CTX_new() is the same as X509_STORE_CTX_new_ex() except that
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the default library context and a NULL property query string are used.
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X509_STORE_CTX_cleanup() internally cleans up an B<X509_STORE_CTX> structure.
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It is used by X509_STORE_CTX_init() and X509_STORE_CTX_free().
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X509_STORE_CTX_free() completely frees up I<ctx>. After this call I<ctx>
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is no longer valid.
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If I<ctx> is NULL nothing is done.
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It must be called before each call to L<X509_verify_cert(3)> or
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L<X509_STORE_CTX_verify(3)>, i.e., a context is only good for one verification.
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If you want to verify a further certificate or chain with the same I<ctx>
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then you must call X509_STORE_CTX_init() again.
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The trusted certificate store is set to I<trust_store> of type B<X509_STORE>.
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This may be NULL because there are no trusted certificates or because
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they are provided simply as a list using X509_STORE_CTX_set0_trusted_stack().
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The certificate to be verified is set to I<target>,
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and a list of additional certificates may be provided in I<untrusted>,
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which will be untrusted but may be used to build the chain.
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Each of the I<trust_store>, I<target> and I<untrusted> parameters can be NULL.
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Yet note that L<X509_verify_cert(3)> and L<X509_STORE_CTX_verify(3)>
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will need a verification target.
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This can also be set using X509_STORE_CTX_set_cert().
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For L<X509_STORE_CTX_verify(3)>, which takes by default the first element of the
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list of untrusted certificates as its verification target,
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this can be also set indirectly using X509_STORE_CTX_set0_untrusted().
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X509_STORE_CTX_set0_trusted_stack() sets the set of trusted certificates of
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I<ctx> to I<sk>. This is an alternative way of specifying trusted certificates
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instead of using an B<X509_STORE> where its complexity is not needed
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or to make sure that only the given set I<sk> of certificates are trusted.
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X509_STORE_CTX_set_cert() sets the target certificate to be verified in I<ctx>
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to I<target>.
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X509_STORE_CTX_set0_verified_chain() sets the validated chain to I<chain>.
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Ownership of the chain is transferred to I<ctx>,
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and so it should not be free'd by the caller.
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X509_STORE_CTX_get0_chain() returns the internal pointer used by the
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I<ctx> that contains the constructed (output) chain.
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X509_STORE_CTX_set0_crls() sets a set of CRLs to use to aid certificate
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verification to I<sk>. These CRLs will only be used if CRL verification is
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enabled in the associated B<X509_VERIFY_PARAM> structure. This might be
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used where additional "useful" CRLs are supplied as part of a protocol,
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for example in a PKCS#7 structure.
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X509_STORE_CTX_get0_param() retrieves an internal pointer
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to the verification parameters associated with I<ctx>.
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X509_STORE_CTX_set0_param() sets the internal verification parameter pointer
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to I<param>. After this call B<param> should not be used.
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X509_STORE_CTX_get0_untrusted() retrieves an internal pointer to the
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stack of untrusted certificates associated with I<ctx>.
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X509_STORE_CTX_set0_untrusted() sets the internal pointer to the stack
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of untrusted certificates associated with I<ctx> to I<sk>.
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X509_STORE_CTX_verify() will take the first element, if any,
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as its default target if the target certificate is not set explicitly.
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X509_STORE_CTX_get_num_untrusted() returns the number of untrusted certificates
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that were used in building the chain.
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This is can be used after calling L<X509_verify_cert(3)> and similar functions.
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With L<X509_STORE_CTX_verify(3)>, this does not count the first chain element.
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X509_STORE_CTX_get0_chain() returns the internal pointer used by the
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I<ctx> that contains the validated chain.
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Details of the chain building and checking process are described in
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L<openssl-verification-options(1)/Certification Path Building> and
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L<openssl-verification-options(1)/Certification Path Validation>.
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X509_STORE_CTX_set0_verified_chain() sets the validated chain used
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by I<ctx> to be I<chain>.
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Ownership of the chain is transferred to I<ctx>,
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and so it should not be free'd by the caller.
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X509_STORE_CTX_set_default() looks up and sets the default verification
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method to I<name>. This uses the function X509_VERIFY_PARAM_lookup() to
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find an appropriate set of parameters from the purpose identifier I<name>.
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Currently defined purposes are C<sslclient>, C<sslserver>, C<nssslserver>,
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C<smimesign>, C<smimeencrypt>, C<crlsign>, C<ocsphelper>, C<timestampsign>,
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and C<any>.
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X509_STORE_CTX_set_verify() provides the capability for overriding the default
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verify function. This function is responsible for verifying chain signatures and
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expiration times.
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A verify function is defined as an X509_STORE_CTX_verify type which has the
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following signature:
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int (*verify)(X509_STORE_CTX *);
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This function should receive the current X509_STORE_CTX as a parameter and
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return 1 on success or 0 on failure.
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=head1 NOTES
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The certificates and CRLs in a store are used internally and should B<not>
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be freed up until after the associated B<X509_STORE_CTX> is freed.
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=head1 BUGS
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The certificates and CRLs in a context are used internally and should B<not>
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be freed up until after the associated B<X509_STORE_CTX> is freed. Copies
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should be made or reference counts increased instead.
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=head1 RETURN VALUES
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X509_STORE_CTX_new() returns a newly allocated context or NULL if an
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error occurred.
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X509_STORE_CTX_init() returns 1 for success or 0 if an error occurred.
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X509_STORE_CTX_get0_param() returns a pointer to an B<X509_VERIFY_PARAM>
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structure or NULL if an error occurred.
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X509_STORE_CTX_cleanup(), X509_STORE_CTX_free(),
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X509_STORE_CTX_set0_trusted_stack(),
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X509_STORE_CTX_set_cert(),
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X509_STORE_CTX_set0_crls() and X509_STORE_CTX_set0_param() do not return
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values.
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X509_STORE_CTX_set_default() returns 1 for success or 0 if an error occurred.
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X509_STORE_CTX_get_num_untrusted() returns the number of untrusted certificates
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used.
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=head1 SEE ALSO
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L<X509_verify_cert(3)>, L<X509_STORE_CTX_verify(3)>,
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L<X509_VERIFY_PARAM_set_flags(3)>
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=head1 HISTORY
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The X509_STORE_CTX_set0_crls() function was added in OpenSSL 1.0.0.
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The X509_STORE_CTX_get_num_untrusted() function was added in OpenSSL 1.1.0.
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The X509_STORE_CTX_new_ex() function was added in OpenSSL 3.0.
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There is no need to call X509_STORE_CTX_cleanup() explicitly since OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2009-2021 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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