X509_verify_cert(3) OpenSSL X509_verify_cert(3)NAME
X509_verify_cert - discover and verify X509 certificte chain
LIBRARY
libcrypto, -lcrypto
SYNOPSIS
#include <openssl/x509.h>
int X509_verify_cert(X509_STORE_CTX *ctx);
DESCRIPTION
The X509_verify_cert() function attempts to discover and validate a certificate chain based on parameters in ctx. A complete description of
the process is contained in the openssl_verify(1) manual page.
RETURN VALUES
If a complete chain can be built and validated this function returns 1, otherwise it return zero, in exceptional circumstances it can also
return a negative code.
If the function fails additional error information can be obtained by examining ctx using, for example X509_STORE_CTX_get_error().
NOTES
Applications rarely call this function directly but it is used by OpenSSL internally for certificate validation, in both the S/MIME and
SSL/TLS code.
The negative return value from X509_verify_cert() can only occur if no certificate is set in ctx (due to a programming error) or if a retry
operation is requested during internal lookups (which never happens with standard lookup methods). It is however recommended that
application check for <= 0 return value on error.
BUGS
This function uses the header x509.h as opposed to most chain verification functiosn which use x509_vfy.h.
SEE ALSO X509_STORE_CTX_get_error(3)HISTORY
X509_verify_cert() is available in all versions of SSLeay and OpenSSL.
1.0.1i 2009-12-27 X509_verify_cert(3)
Check Out this Related Man Page
X509_STORE_CTX_new(3) OpenSSL 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_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_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);
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);
DESCRIPTION
These functions initialise an X509_STORE_CTX structure for subsequent use by X509_verify_cert().
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 an new call to
X509_STORE_CTX_init().
X509_STORE_CTX_free() completely frees up ctx. After this call ctx is no longer valid.
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_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_set_cert() sets the certificate to be vertified 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_VERIFY_PARAM *X509_STORE_CTX_get0_param() retrieves an intenal pointer to the verification parameters associated with ctx.
X509_STORE_CTX_set0_param() sets the intenal 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()
to find an appropriate set of parameters from name.
NOTES
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);
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.
RETURN VALUES
X509_STORE_CTX_new() returns an newly allocates context or NULL is an error occurred.
X509_STORE_CTX_init() returns 1 for success or 0 if an error occurred.
X509_STORE_CTX_get0_param() returns a pointer to an X509_VERIFY_PARAM structure or NULL if an error occurred.
X509_STORE_CTX_cleanup(), X509_STORE_CTX_free(), X509_STORE_CTX_trusted_stack(), X509_STORE_CTX_set_cert(), X509_STORE_CTX_set_chain(),
X509_STORE_CTX_set0_crls() and X509_STORE_CTX_set0_param() do not return values.
X509_STORE_CTX_set_default() returns 1 for success or 0 if an error occurred.
SEE ALSO X509_verify_cert(3)X509_VERIFY_PARAM_set_flags(3)HISTORY
X509_STORE_CTX_set0_crls() was first added to OpenSSL 1.0.0
1.0.1e 2013-02-11 X509_STORE_CTX_new(3)