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f7e47677e3
Add a key/keyring change notification facility whereby notifications about
changes in key and keyring content and attributes can be received.
Firstly, an event queue needs to be created:
pipe2(fds, O_NOTIFICATION_PIPE);
ioctl(fds[1], IOC_WATCH_QUEUE_SET_SIZE, 256);
then a notification can be set up to report notifications via that queue:
struct watch_notification_filter filter = {
.nr_filters = 1,
.filters = {
[0] = {
.type = WATCH_TYPE_KEY_NOTIFY,
.subtype_filter[0] = UINT_MAX,
},
},
};
ioctl(fds[1], IOC_WATCH_QUEUE_SET_FILTER, &filter);
keyctl_watch_key(KEY_SPEC_SESSION_KEYRING, fds[1], 0x01);
After that, records will be placed into the queue when events occur in
which keys are changed in some way. Records are of the following format:
struct key_notification {
struct watch_notification watch;
__u32 key_id;
__u32 aux;
} *n;
Where:
n->watch.type will be WATCH_TYPE_KEY_NOTIFY.
n->watch.subtype will indicate the type of event, such as
NOTIFY_KEY_REVOKED.
n->watch.info & WATCH_INFO_LENGTH will indicate the length of the
record.
n->watch.info & WATCH_INFO_ID will be the second argument to
keyctl_watch_key(), shifted.
n->key will be the ID of the affected key.
n->aux will hold subtype-dependent information, such as the key
being linked into the keyring specified by n->key in the case of
NOTIFY_KEY_LINKED.
Note that it is permissible for event records to be of variable length -
or, at least, the length may be dependent on the subtype. Note also that
the queue can be shared between multiple notifications of various types.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jamorris@linux.microsoft.com>
105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_LINUX_WATCH_QUEUE_H
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#define _UAPI_LINUX_WATCH_QUEUE_H
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/ioctl.h>
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#define O_NOTIFICATION_PIPE O_EXCL /* Parameter to pipe2() selecting notification pipe */
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#define IOC_WATCH_QUEUE_SET_SIZE _IO('W', 0x60) /* Set the size in pages */
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#define IOC_WATCH_QUEUE_SET_FILTER _IO('W', 0x61) /* Set the filter */
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enum watch_notification_type {
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WATCH_TYPE_META = 0, /* Special record */
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WATCH_TYPE_KEY_NOTIFY = 1, /* Key change event notification */
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WATCH_TYPE__NR = 2
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};
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enum watch_meta_notification_subtype {
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WATCH_META_REMOVAL_NOTIFICATION = 0, /* Watched object was removed */
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WATCH_META_LOSS_NOTIFICATION = 1, /* Data loss occurred */
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};
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/*
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* Notification record header. This is aligned to 64-bits so that subclasses
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* can contain __u64 fields.
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*/
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struct watch_notification {
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__u32 type:24; /* enum watch_notification_type */
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__u32 subtype:8; /* Type-specific subtype (filterable) */
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__u32 info;
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#define WATCH_INFO_LENGTH 0x0000007f /* Length of record */
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#define WATCH_INFO_LENGTH__SHIFT 0
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#define WATCH_INFO_ID 0x0000ff00 /* ID of watchpoint */
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#define WATCH_INFO_ID__SHIFT 8
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#define WATCH_INFO_TYPE_INFO 0xffff0000 /* Type-specific info */
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#define WATCH_INFO_TYPE_INFO__SHIFT 16
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#define WATCH_INFO_FLAG_0 0x00010000 /* Type-specific info, flag bit 0 */
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#define WATCH_INFO_FLAG_1 0x00020000 /* ... */
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#define WATCH_INFO_FLAG_2 0x00040000
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#define WATCH_INFO_FLAG_3 0x00080000
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#define WATCH_INFO_FLAG_4 0x00100000
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#define WATCH_INFO_FLAG_5 0x00200000
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#define WATCH_INFO_FLAG_6 0x00400000
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#define WATCH_INFO_FLAG_7 0x00800000
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};
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/*
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* Notification filtering rules (IOC_WATCH_QUEUE_SET_FILTER).
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*/
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struct watch_notification_type_filter {
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__u32 type; /* Type to apply filter to */
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__u32 info_filter; /* Filter on watch_notification::info */
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__u32 info_mask; /* Mask of relevant bits in info_filter */
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__u32 subtype_filter[8]; /* Bitmask of subtypes to filter on */
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};
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struct watch_notification_filter {
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__u32 nr_filters; /* Number of filters */
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__u32 __reserved; /* Must be 0 */
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struct watch_notification_type_filter filters[];
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};
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/*
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* Extended watch removal notification. This is used optionally if the type
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* wants to indicate an identifier for the object being watched, if there is
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* such. This can be distinguished by the length.
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*
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* type -> WATCH_TYPE_META
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* subtype -> WATCH_META_REMOVAL_NOTIFICATION
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*/
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struct watch_notification_removal {
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struct watch_notification watch;
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__u64 id; /* Type-dependent identifier */
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};
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/*
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* Type of key/keyring change notification.
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*/
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enum key_notification_subtype {
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NOTIFY_KEY_INSTANTIATED = 0, /* Key was instantiated (aux is error code) */
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NOTIFY_KEY_UPDATED = 1, /* Key was updated */
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NOTIFY_KEY_LINKED = 2, /* Key (aux) was added to watched keyring */
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NOTIFY_KEY_UNLINKED = 3, /* Key (aux) was removed from watched keyring */
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NOTIFY_KEY_CLEARED = 4, /* Keyring was cleared */
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NOTIFY_KEY_REVOKED = 5, /* Key was revoked */
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NOTIFY_KEY_INVALIDATED = 6, /* Key was invalidated */
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NOTIFY_KEY_SETATTR = 7, /* Key's attributes got changed */
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};
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/*
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* Key/keyring notification record.
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* - watch.type = WATCH_TYPE_KEY_NOTIFY
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* - watch.subtype = enum key_notification_type
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*/
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struct key_notification {
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struct watch_notification watch;
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__u32 key_id; /* The key/keyring affected */
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__u32 aux; /* Per-type auxiliary data */
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};
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#endif /* _UAPI_LINUX_WATCH_QUEUE_H */
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