.\" $OpenBSD: SSL_load_client_CA_file.3,v 1.9 2019/06/12 09:36:30 schwarze Exp $ .\" OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100 .\" .\" This file is a derived work. .\" The changes are covered by the following Copyright and license: .\" .\" Copyright (c) 2016 Ingo Schwarze .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. 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IN NO EVENT SHALL THE OpenSSL PROJECT OR .\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, .\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; .\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, .\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED .\" OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd $Mdocdate: June 12 2019 $ .Dt SSL_LOAD_CLIENT_CA_FILE 3 .Os .Sh NAME .Nm SSL_load_client_CA_file , .Nm SSL_add_file_cert_subjects_to_stack , .Nm SSL_add_dir_cert_subjects_to_stack .Nd load certificate names from files .Sh SYNOPSIS .In openssl/ssl.h .Ft STACK_OF(X509_NAME) * .Fn SSL_load_client_CA_file "const char *file" .Ft int .Fo SSL_add_file_cert_subjects_to_stack .Fa "STACK_OF(X509_NAME) *stack" .Fa "const char *file" .Fc .Ft int .Fo SSL_add_dir_cert_subjects_to_stack .Fa "STACK_OF(X509_NAME) *stack" .Fa "const char *dir" .Fc .Sh DESCRIPTION .Fn SSL_load_client_CA_file reads PEM formatted certificates from .Fa file and returns a new .Vt STACK_OF(X509_NAME) with the subject names found. While the name suggests the specific usage as a support function for .Xr SSL_CTX_set_client_CA_list 3 , it is not limited to CA certificates. .Pp .Fn SSL_add_file_cert_subjects_to_stack is similar except that the names are added to the existing .Fa stack . .Pp .Fn SSL_add_dir_cert_subjects_to_stack calls .Fn SSL_add_file_cert_subjects_to_stack on every file in the directory .Fa dir . .Pp If a name is already on the stack, all these functions skip it and do not add it again. .Sh RETURN VALUES .Fn SSL_load_client_CA_file returns a pointer to the new .Vt STACK_OF(X509_NAME) or .Dv NULL on failure . .Pp .Fn SSL_add_file_cert_subjects_to_stack and .Fn SSL_add_dir_cert_subjects_to_stack return 1 for success or 0 for failure. .Pp All these functions treat empty files and directories as failures. .Pp In some cases of failure, the reason can be determined with .Xr ERR_get_error 3 . .Sh EXAMPLES Load names of CAs from a file and use it as a client CA list: .Bd -literal SSL_CTX *ctx; STACK_OF(X509_NAME) *cert_names; \&... cert_names = SSL_load_client_CA_file("/path/to/CAfile.pem"); if (cert_names != NULL) SSL_CTX_set_client_CA_list(ctx, cert_names); else error_handling(); \&... .Ed .Sh SEE ALSO .Xr PEM_read_bio_X509 3 , .Xr ssl 3 , .Xr SSL_CTX_set_client_CA_list 3 , .Xr X509_get_subject_name 3 , .Xr X509_NAME_new 3 .Sh HISTORY .Fn SSL_load_client_CA_file first appeared in SSLeay 0.8.0 and has been available since .Ox 2.4 . .Pp .Fn SSL_add_file_cert_subjects_to_stack and .Fn SSL_add_dir_cert_subjects_to_stack first appeared in OpenSSL 0.9.2b and have been available since .Ox 2.6 . .Sh AUTHORS .Fn SSL_add_file_cert_subjects_to_stack and .Fn SSL_add_dir_cert_subjects_to_stack were written by .An Ben Laurie Aq Mt ben@openssl.org in 1999. .Sh BUGS In some cases of failure, for example for empty files and directories, these functions fail to report an error, in the sense that .Xr ERR_get_error 3 does not work. .Pp Even in case of failure, for example when parsing one of the files or certificates fails, .Fn SSL_add_file_cert_subjects_to_stack and .Fn SSL_add_dir_cert_subjects_to_stack may still have added some certificates to the stack. .Pp The behaviour of .Fn SSL_add_dir_cert_subjects_to_stack is non-deterministic. If parsing one file fails, parsing of the whole directory is aborted. Files in the directory are not parsed in any specific order. For example, adding an empty file to .Fa dir may or may not cause some of the other files to be ignored.