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NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | RETURNS | SINCE | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
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gnutls_certif...e_verify_peers(3) gnutlsgnutls_certif...e_verify_peers(3)
gnutls_certificate_verify_peers - API function
#include <gnutls/gnutls.h>
int gnutls_certificate_verify_peers(gnutls_session_t session,
gnutls_typed_vdata_st * data, unsigned int elements, unsigned int
* status);
gnutls_session_t session
is a gnutls session
gnutls_typed_vdata_st * data
an array of typed data
unsigned int elements
the number of data elements
unsigned int * status
is the output of the verification
This function will verify the peer's certificate and store the the
status in the status variable as a bitwise OR of
gnutls_certificate_status_t values or zero if the certificate is
trusted. Note that value in status is set only when the return
value of this function is success (i.e, failure to trust a
certificate does not imply a negative return value). The default
verification flags used by this function can be overridden using
gnutls_certificate_set_verify_flags(). See the documentation of
gnutls_certificate_verify_peers2() for details in the verification
process.
This function will take into account the stapled OCSP responses
sent by the server, as well as the following X.509 certificate
extensions: Name Constraints, Key Usage, and Basic Constraints
(pathlen).
The acceptable data types are GNUTLS_DT_DNS_HOSTNAME,
GNUTLS_DT_RFC822NAME and GNUTLS_DT_KEY_PURPOSE_OID. The former
two accept as data a null-terminated hostname or email address,
and the latter a null-terminated object identifier (e.g.,
GNUTLS_KP_TLS_WWW_SERVER).
If a DNS hostname is provided then this function will compare the
hostname in the certificate against the given. If names do not
match the GNUTLS_CERT_UNEXPECTED_OWNER status flag will be set.
If a key purpose OID is provided and the end-certificate contains
the extended key usage PKIX extension, it will be required to be
have the provided key purpose or be marked for any purpose,
otherwise verification status will have the
GNUTLS_CERT_SIGNER_CONSTRAINTS_FAILURE flag set.
To avoid denial of service attacks some default upper limits
regarding the certificate key size and chain size are set. To
override them use gnutls_certificate_set_verify_limits().
Note that when using raw public-keys verification will not work
because there is no corresponding certificate body belonging to
the raw key that can be verified. In that case this function will
return GNUTLS_E_INVALID_REQUEST.
GNUTLS_E_SUCCESS (0) when the validation is performed, or a
negative error code otherwise. A successful error code means that
the status parameter must be checked to obtain the validation
status.
3.3.0
Report bugs to <[email protected]>.
Home page: https://www.gnutls.org
Copyright © 2001-2023 Free Software Foundation, Inc., and others.
Copying and distribution of this file, with or without
modification, are permitted in any medium without royalty provided
the copyright notice and this notice are preserved.
The full documentation for gnutls is maintained as a Texinfo
manual. If the /usr/share/doc/gnutls/ directory does not contain
the HTML form visit
https://www.gnutls.org/manual/
This page is part of the GnuTLS (GnuTLS Transport Layer Security
Library) project. Information about the project can be found at
⟨http://www.gnutls.org/⟩. If you have a bug report for this
manual page, send it to [email protected]. This page was obtained
from the tarball fetched from
⟨https://www.gnupg.org/ftp/gcrypt/gnutls/⟩ on 2025-08-11. If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for the
page, or you have corrections or improvements to the information
in this COLOPHON (which is not part of the original manual page),
send a mail to [email protected]
gnutls 3.8.10gnutls_certif...e_verify_peers(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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