Re: [PATCH v2 7/7] crypto: Make QCryptoTLSCreds* structures private

["Daniel P. Berrangé" <berrange@redhat.com>]

On Tue, Jun 15, 2021 at 07:16:17PM +0200, Philippe Mathieu-Daudé wrote:
> On 6/15/21 6:52 PM, Daniel P. Berrangé wrote:
> > On Tue, Jun 15, 2021 at 06:47:51PM +0200, Philippe Mathieu-Daudé wrote:
> >> Code consuming the "crypto/tlscreds*.h" APIs doesn't need
> >> to access its internals. Move the structure definitions to
> >> the implementations in crypto/. The headers still forward
> >> declare the structures typedef.
> >>
> >> This solves a bug introduced by commit 7de2e856533 which made
> >> migration/qemu-file-channel.c include "io/channel-tls.h",
> >> itself sometime depends on GNUTLS, leading to build failure
> >> on OSX:
> >>
> >>   [2/35] Compiling C object libmigration.fa.p/migration_qemu-file-channel.c.o
> >>   FAILED: libmigration.fa.p/migration_qemu-file-channel.c.o
> >>   cc -Ilibmigration.fa.p -I. -I.. -Iqapi [ ... ] -o libmigration.fa.p/migration_qemu-file-channel.c.o -c ../migration/qemu-file-channel.c
> >>   In file included from ../migration/qemu-file-channel.c:29:
> >>   In file included from include/io/channel-tls.h:26:
> >>   In file included from include/crypto/tlssession.h:24:
> >>   include/crypto/tlscreds.h:28:10: fatal error: 'gnutls/gnutls.h' file not found
> >>   #include <gnutls/gnutls.h>
> >>            ^~~~~~~~~~~~~~~~~
> >>   1 error generated.
> >>
> >> Reported-by: Stefan Weil <sw@weilnetz.de>
> >> Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
> >> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/407
> >> Fixes: 7de2e856533 ("yank: Unregister function when using TLS migration")
> >> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> >> ---
> >>  crypto/tlscredspriv.h         | 15 +++++++++++++++
> >>  include/crypto/tlscreds.h     | 16 ----------------
> >>  include/crypto/tlscredsanon.h | 12 ------------
> >>  include/crypto/tlscredspsk.h  | 12 ------------
> >>  include/crypto/tlscredsx509.h | 10 ----------
> >>  crypto/tlscredsanon.c         | 13 +++++++++++++
> >>  crypto/tlscredspsk.c          | 14 ++++++++++++++
> >>  crypto/tlscredsx509.c         | 16 +++++++++++++---
> >>  8 files changed, 55 insertions(+), 53 deletions(-)
> > 
> > Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
> 
> Thanks, however I missed something:
> 
> crypto/tlssession.c: In function ‘qcrypto_tls_session_new’:
> crypto/tlssession.c:163:48: error: invalid use of incomplete typedef
> ‘QCryptoTLSCredsAnon’
>   163 |                                          acreds->data.server);
>       |                                                ^~
> crypto/tlssession.c:167:48: error: invalid use of incomplete typedef
> ‘QCryptoTLSCredsAnon’
>   167 |                                          acreds->data.client);
>       |                                                ^~
> crypto/tlssession.c:201:48: error: invalid use of incomplete typedef
> ‘QCryptoTLSCredsPSK’
>   201 |                                          pcreds->data.server);
>       |                                                ^~
> crypto/tlssession.c:205:48: error: invalid use of incomplete typedef
> ‘QCryptoTLSCredsPSK’
>   205 |                                          pcreds->data.client);
>       |                                                ^~
> crypto/tlssession.c:228:44: error: invalid use of incomplete typedef
> ‘QCryptoTLSCredsX509’
>   228 |                                      tcreds->data);
>       |                                            ^~

Ah, yes, the tls session code needs to peer at the tlscred data.

We could have a 'crypto/tlscredspriv.h' header that declares
some accessors for getting this data from tls session.

Regards,
Daniel
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