Revision a520723f29aac6598ff0d69e34f5e9b88213e511 authored by Matt Caswell on 14 October 2016, 12:07:00 UTC, committed by Matt Caswell on 28 October 2016, 08:43:41 UTC
The previous commit inspired a review of all the length checks for the extension adding code. This adds more robust checks and adds checks where some were missing previously. The real solution for this is to use WPACKET which is currently in master - but that cannot be applied to release branches. Reviewed-by: Rich Salz <rsalz@openssl.org>
1 parent 83a1d4b
CMS_get0_SignerInfos.pod
=pod
=head1 NAME
CMS_get0_SignerInfos, CMS_SignerInfo_get0_signer_id, CMS_SignerInfo_get0_signature, CMS_SignerInfo_cert_cmp, CMS_set1_signer_cert - CMS signedData signer functions.
=head1 SYNOPSIS
#include <openssl/cms.h>
STACK_OF(CMS_SignerInfo) *CMS_get0_SignerInfos(CMS_ContentInfo *cms);
int CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si, ASN1_OCTET_STRING **keyid, X509_NAME **issuer, ASN1_INTEGER **sno);
ASN1_OCTET_STRING *CMS_SignerInfo_get0_signature(CMS_SignerInfo *si);
int CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert);
void CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer);
=head1 DESCRIPTION
The function CMS_get0_SignerInfos() returns all the CMS_SignerInfo structures
associated with a CMS signedData structure.
CMS_SignerInfo_get0_signer_id() retrieves the certificate signer identifier
associated with a specific CMS_SignerInfo structure B<si>. Either the
keyidentifier will be set in B<keyid> or B<both> issuer name and serial number
in B<issuer> and B<sno>.
CMS_SignerInfo_get0_signature() retrieves the signature associated with
B<si> in a pointer to an ASN1_OCTET_STRING structure. This pointer returned
corresponds to the internal signature value if B<si> so it may be read or
modified.
CMS_SignerInfo_cert_cmp() compares the certificate B<cert> against the signer
identifier B<si>. It returns zero if the comparison is successful and non zero
if not.
CMS_SignerInfo_set1_signer_cert() sets the signers certificate of B<si> to
B<signer>.
=head1 NOTES
The main purpose of these functions is to enable an application to lookup
signers certificates using any appropriate technique when the simpler method
of CMS_verify() is not appropriate.
In typical usage and application will retrieve all CMS_SignerInfo structures
using CMS_get0_SignerInfo() and retrieve the identifier information using
CMS. It will then obtain the signer certificate by some unspecified means
(or return and error if it cannot be found) and set it using
CMS_SignerInfo_set1_signer_cert().
Once all signer certificates have been set CMS_verify() can be used.
Although CMS_get0_SignerInfos() can return NULL is an error occur B<or> if
there are no signers this is not a problem in practice because the only
error which can occur is if the B<cms> structure is not of type signedData
due to application error.
=head1 RETURN VALUES
CMS_get0_SignerInfos() returns all CMS_SignerInfo structures, or NULL there
are no signers or an error occurs.
CMS_SignerInfo_get0_signer_id() returns 1 for success and 0 for failure.
CMS_SignerInfo_cert_cmp() returns 0 for a successful comparison and non
zero otherwise.
CMS_SignerInfo_set1_signer_cert() does not return a value.
Any error can be obtained from L<ERR_get_error(3)|ERR_get_error(3)>
=head1 SEE ALSO
L<ERR_get_error(3)|ERR_get_error(3)>, L<CMS_verify(3)|CMS_verify(3)>
=head1 HISTORY
These functions were first was added to OpenSSL 0.9.8
=cut
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