gnutls_certificate_verify_peers(3)

1gnutls_certificate_verify_peers(3)  gnutls  gnutls_certificate_verify_peers(3)
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NAME

6       gnutls_certificate_verify_peers - API function
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SYNOPSIS

9       #include <gnutls/gnutls.h>
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11       int      gnutls_certificate_verify_peers(gnutls_session_t      session,
12       gnutls_typed_vdata_st * data, unsigned int  elements,  unsigned  int  *
13       status);
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ARGUMENTS

16       gnutls_session_t session
17                   is a gnutls session
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19       gnutls_typed_vdata_st * data
20                   an array of typed data
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22       unsigned int elements
23                   the number of data elements
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25       unsigned int * status
26                   is the output of the verification
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DESCRIPTION

29       This function will verify the peer's certificate and store the the sta‐
30       tus in the  status variable as a bitwise OR of  gnutls_certificate_sta‐
31       tus_t  values or zero if the certificate is trusted. Note that value in
32       status is set only when the return value of this  function  is  success
33       (i.e,  failure  to trust a certificate does not imply a negative return
34       value).  The default verification flags used by this  function  can  be
35       overridden  using  gnutls_certificate_set_verify_flags(). See the docu‐
36       mentation of gnutls_certificate_verify_peers2() for details in the ver‐
37       ification process.
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39       This function will take into account the stapled OCSP responses sent by
40       the server, as well as the following X.509 certificate extensions: Name
41       Constraints, Key Usage, and Basic Constraints (pathlen).
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43       The     acceptable      data    types    are    GNUTLS_DT_DNS_HOSTNAME,
44       GNUTLS_DT_RFC822NAME and  GNUTLS_DT_KEY_PURPOSE_OID.   The  former  two
45       accept  as  data  a  null-terminated hostname or email address, and the
46       latter     a     null-terminated     object      identifier      (e.g.,
47       GNUTLS_KP_TLS_WWW_SERVER).
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49       If a DNS hostname is provided then this function will compare the host‐
50       name in the certificate against the given. If names do  not  match  the
51       GNUTLS_CERT_UNEXPECTED_OWNER status flag will be set.  If a key purpose
52       OID is provided and the end-certificate contains the extended key usage
53       PKIX extension, it will be required to be have the provided key purpose
54       or be marked for any purpose, otherwise verification status  will  have
55       the GNUTLS_CERT_SIGNER_CONSTRAINTS_FAILURE flag set.
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57       To  avoid denial of service attacks some default upper limits regarding
58       the certificate key size and chain size are set. To override  them  use
59       gnutls_certificate_set_verify_limits().
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61       Note that when using raw public-keys verification will not work because
62       there is no corresponding certificate body belonging  to  the  raw  key
63       that   can  be  verified.  In  that  case  this  function  will  return
64       GNUTLS_E_INVALID_REQUEST.
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RETURNS

67       GNUTLS_E_SUCCESS (0) when the validation is performed,  or  a  negative
68       error  code  otherwise.  A successful error code means that the  status
69       parameter must be checked to obtain the validation status.
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SINCE

72       3.3.0
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REPORTING BUGS

75       Report bugs to <bugs@gnutls.org>.
76       Home page: https://www.gnutls.org
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COPYRIGHT

80       Copyright © 2001-2019 Free Software Foundation, Inc., and others.
81       Copying and distribution of this file, with  or  without  modification,
82       are  permitted  in  any  medium  without royalty provided the copyright
83       notice and this notice are preserved.
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