Revision 05f61fb27efaf1a3f4cfa1a8d4d62c34e3c8a0fe authored by Emilia Kasper on 25 August 2014, 10:38:16 UTC, committed by Emilia Kasper on 27 August 2014, 17:42:31 UTC
The old code implicitly relies on the ASN.1 code returning a \0-prefixed buffer when the buffer length is 0. Change this to verify explicitly that the ASN.1 string has positive length. Reviewed-by: Dr Stephen Henson <steve@openssl.org> (cherry picked from commit 82dc08de54ce443c2a9ac478faffe79e76157795)
1 parent 10be715
X509_verify_cert.pod
=pod
=head1 NAME
X509_verify_cert - discover and verify X509 certificte chain
=head1 SYNOPSIS
#include <openssl/x509.h>
int X509_verify_cert(X509_STORE_CTX *ctx);
=head1 DESCRIPTION
The X509_verify_cert() function attempts to discover and validate a
certificate chain based on parameters in B<ctx>. A complete description of
the process is contained in the L<verify(1)|verify(1)> manual page.
=head1 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 B<ctx> using, for example X509_STORE_CTX_get_error().
=head1 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 B<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.
=head1 BUGS
This function uses the header B<x509.h> as opposed to most chain verification
functiosn which use B<x509_vfy.h>.
=head1 SEE ALSO
L<X509_STORE_CTX_get_error(3)|X509_STORE_CTX_get_error(3)>
=head1 HISTORY
X509_verify_cert() is available in all versions of SSLeay and OpenSSL.
=cut
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