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bh=emmvmASQa/Ii+7RqHVvCxBkIyv2EOg9lzPdlgiyJKRw=; b=ZWF2fMjOfnJYvcv5ONxN/VSRTlJgQLVH8UHGYIulhMBFzR983wsAO4pJdHZYA4Ihz9QO+h loUdN7jJFVUBR0ywwvK4l3bdG14/vq825VIOdafOOAWVQ3BPeeJ3n5Ou+dJ3k0RtCfLUEL ccWouaantq1ffThgUChhgmcNraA46iE= X-MC-Unique: mcBLKkEMOxKFvQzU-mba1g-1 From: Anthony Harivel To: pbonzini@redhat.com, mtosatti@redhat.com, berrange@redhat.com Cc: qemu-devel@nongnu.org, vchundur@redhat.com, rjarry@redhat.com, Anthony Harivel Subject: [PATCH v6 1/3] qio: add support for SO_PEERCRED for socket channel Date: Wed, 22 May 2024 17:34:50 +0200 Message-ID: <20240522153453.1230389-2-aharivel@redhat.com> In-Reply-To: <20240522153453.1230389-1-aharivel@redhat.com> References: <20240522153453.1230389-1-aharivel@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.9 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=aharivel@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1716392157361100001 Content-Type: text/plain; charset="utf-8" The function qio_channel_get_peercred() returns a pointer to the credentials of the peer process connected to this socket. This credentials structure is defined in as follows: struct ucred { pid_t pid; /* Process ID of the sending process */ uid_t uid; /* User ID of the sending process */ gid_t gid; /* Group ID of the sending process */ }; The use of this function is possible only for connected AF_UNIX stream sockets and for AF_UNIX stream and datagram socket pairs. On platform other than Linux, the function return 0. Signed-off-by: Anthony Harivel --- include/io/channel.h | 21 +++++++++++++++++++++ io/channel-socket.c | 28 ++++++++++++++++++++++++++++ io/channel.c | 13 +++++++++++++ 3 files changed, 62 insertions(+) diff --git a/include/io/channel.h b/include/io/channel.h index 7986c49c713a..bdf0bca92ae2 100644 --- a/include/io/channel.h +++ b/include/io/channel.h @@ -160,6 +160,9 @@ struct QIOChannelClass { void *opaque); int (*io_flush)(QIOChannel *ioc, Error **errp); + int (*io_peerpid)(QIOChannel *ioc, + unsigned int *pid, + Error **errp); }; =20 /* General I/O handling functions */ @@ -981,4 +984,22 @@ int coroutine_mixed_fn qio_channel_writev_full_all(QIO= Channel *ioc, int qio_channel_flush(QIOChannel *ioc, Error **errp); =20 +/** + * qio_channel_get_peercred: + * @ioc: the channel object + * @pid: pointer to pid + * @errp: pointer to a NULL-initialized error object + * + * Returns the pid of the peer process connected to this socket. + * + * The use of this function is possible only for connected + * AF_UNIX stream sockets and for AF_UNIX stream and datagram + * socket pairs on Linux. + * Return -1 on error with pid -1 for the non-Linux OS. + * + */ +int qio_channel_get_peerpid(QIOChannel *ioc, + unsigned int *pid, + Error **errp); + #endif /* QIO_CHANNEL_H */ diff --git a/io/channel-socket.c b/io/channel-socket.c index 3a899b060858..608bcf066ecd 100644 --- a/io/channel-socket.c +++ b/io/channel-socket.c @@ -841,6 +841,33 @@ qio_channel_socket_set_cork(QIOChannel *ioc, socket_set_cork(sioc->fd, v); } =20 +static int +qio_channel_socket_get_peerpid(QIOChannel *ioc, + unsigned int *pid, + Error **errp) +{ +#ifdef CONFIG_LINUX + QIOChannelSocket *sioc =3D QIO_CHANNEL_SOCKET(ioc); + Error *err =3D NULL; + socklen_t len =3D sizeof(struct ucred); + + struct ucred cred; + if (getsockopt(sioc->fd, + SOL_SOCKET, SO_PEERCRED, + &cred, &len) =3D=3D -1) { + error_setg_errno(&err, errno, "Unable to get peer credentials"); + error_propagate(errp, err); + *pid =3D -1; + return -1; + } + *pid =3D (unsigned int)cred.pid; + return 0; +#else + error_setg(errp, "Unsupported feature"); + *pid =3D -1; + return -1; +#endif +} =20 static int qio_channel_socket_close(QIOChannel *ioc, @@ -938,6 +965,7 @@ static void qio_channel_socket_class_init(ObjectClass *= klass, #ifdef QEMU_MSG_ZEROCOPY ioc_klass->io_flush =3D qio_channel_socket_flush; #endif + ioc_klass->io_peerpid =3D qio_channel_socket_get_peerpid; } =20 static const TypeInfo qio_channel_socket_info =3D { diff --git a/io/channel.c b/io/channel.c index a1f12f8e9096..e3f17c24a00f 100644 --- a/io/channel.c +++ b/io/channel.c @@ -548,6 +548,19 @@ void qio_channel_set_cork(QIOChannel *ioc, } } =20 +int qio_channel_get_peerpid(QIOChannel *ioc, + unsigned int *pid, + Error **errp) +{ + QIOChannelClass *klass =3D QIO_CHANNEL_GET_CLASS(ioc); + + if (!klass->io_peerpid) { + error_setg(errp, "Channel does not support peer pid"); + return -1; + } + klass->io_peerpid(ioc, pid, errp); + return 0; +} =20 off_t qio_channel_io_seek(QIOChannel *ioc, off_t offset, --=20 2.45.1