X509_STORE_LOAD_LOCATIONS(3) | Library Functions Manual | X509_STORE_LOAD_LOCATIONS(3)

# NAME

`X509_STORE_load_locations`, `X509_STORE_set_default_paths`, `X509_STORE_load_mem`, `X509_STORE_add_lookup` — configure files and directories used by a certificate store

# SYNOPSIS

library “libcrypto”
`#include <openssl/x509_vfy.h>`

int
`X509_STORE_load_locations`(X509_STORE *store, const char *file, const char *dirs);

int
`X509_STORE_set_default_paths`(X509_STORE *store);

int
`X509_STORE_load_mem`(X509_STORE *store, void *buffer, int length);

X509_LOOKUP *
`X509_STORE_add_lookup`(X509_STORE *store, const X509_LOOKUP_METHOD *method);

# DESCRIPTION

`X509_STORE_load_locations`() instructs the store to use the PEM file and all the PEM files in the directories contained in the colon-separated list dirs for looking up certificates, in addition to files and directories that are already configured. The certificates in the directories must be in hashed form, as documented in X509_LOOKUP_hash_dir(3). Directories already in use are not added again. If `NULL` is passed for file or dirs, no new file or no new directories are added, respectively.

`X509_STORE_load_locations`() is identical to SSL_CTX_load_verify_locations(3) except that it operates directly on an X509_STORE object, rather than on the store used by an SSL context. See that manual page for more information.

`X509_STORE_set_default_paths`() is similar except that it instructs the store to use the default PEM file and directory (as documented in FILES) in addition to what is already configured. It ignores errors that occur while trying to load the file or to add the directory, but it may still fail for other reasons, for example when out of memory while trying to allocate the required X509_LOOKUP objects.

`X509_STORE_set_default_paths`() is identical to SSL_CTX_set_default_verify_paths(3) except that it operates directly on an X509_STORE object, rather than on the store used by an SSL context. See that manual page for more information.

The above functions are wrappers around X509_LOOKUP_load_file(3) and X509_LOOKUP_add_dir(3).

`X509_STORE_load_mem`() instructs the store to use the certificates contained in the memory buffer of the given length for certificate lookup. It is a wrapper around X509_LOOKUP_add_mem(3).

`X509_STORE_add_lookup`() checks whether the store already contains an X509_LOOKUP object using the given method; if it does, the existing object is returned and no other action occurs. Otherwise, a new X509_LOOKUP object is allocated, added, and returned. This function is used internally by all the functions listed above.

# RETURN VALUES

`X509_STORE_load_locations`() returns 1 if all files and directories specified were successfully added. It returns 0 for failure. That can happen if adding the file failed, if adding any of the directories failed, or if both arguments were `NULL`.

`X509_STORE_set_default_paths`() returns 0 for some error conditions and 1 otherwise, not just for success, but also for various cases of failure.

`X509_STORE_load_mem`() returns 1 for success or 0 for failure. In particular, parse errors or lack of memory can cause failure.

`X509_STORE_add_lookup`() returns the existing or new lookup object or `NULL` on failure. This is an internal pointer that must not be freed. With LibreSSL, the only reason for failure is lack of memory.

# FILES

/etc/ssl/cert.pem
  default PEM file for `X509_STORE_set_default_paths`()
/etc/ssl/certs/
  default directory for `X509_STORE_set_default_paths`()

# SEE ALSO

SSL_CTX_load_verify_locations(3), X509_load_cert_file(3), X509_LOOKUP_hash_dir(3), X509_LOOKUP_new(3), X509_STORE_new(3), X509_STORE_set1_param(3), X509_STORE_set_verify_cb(3)

# HISTORY

`X509_STORE_load_locations`(), `X509_STORE_set_default_paths`(), and `X509_STORE_add_lookup`() first appeared in SSLeay 0.8.0 and have been available since OpenBSD 2.4.

`X509_STORE_load_mem`() first appeared in OpenBSD 5.7.

# BUGS

By the time that adding a directory is found to have failed, the file and some other directories may already have been successfully loaded, so these functions may change the state of the store even when they fail.

`X509_STORE_set_default_paths`() clears the error queue, deleting even error information that was already present when it was called.

June 8, 2025 | Debian