acl-mailbox.c revision 7fb70daba4e571eab5b64f496d20b9e37e31141b
/* Copyright (C) 2006 Timo Sirainen */
/* FIXME: If we don't have permission to change flags/keywords, the changes
should still be stored temporarily for this session. However most clients
don't care and it's a huge job, so I currently this isn't done. The same
problem actually exists when opening read-only mailboxes. */
#include "lib.h"
#include "array.h"
#include "istream.h"
#include "mail-storage-private.h"
#include "acl-api-private.h"
#include "acl-plugin.h"
#include <sys/stat.h>
#define ACL_CONTEXT(obj) \
*((void **)array_idx_modifyable(&(obj)->module_contexts, \
acl_storage_module_id))
struct acl_mailbox {
struct mailbox_vfuncs super;
struct acl_object *aclobj;
unsigned int save_hack:1;
};
struct acl_mail {
struct mail_vfuncs super;
};
static int acl_mailbox_close(struct mailbox *box)
{
struct acl_mailbox *abox = ACL_CONTEXT(box);
acl_object_deinit(&abox->aclobj);
return abox->super.close(box);
}
static int mailbox_acl_right_lookup(struct mailbox *box, unsigned int right_idx)
{
struct acl_mailbox *abox = ACL_CONTEXT(box);
struct acl_mail_storage *astorage = ACL_CONTEXT(box->storage);
int ret;
ret = acl_object_have_right(abox->aclobj,
astorage->acl_storage_right_idx[right_idx]);
if (ret > 0)
return 1;
if (ret < 0)
return -1;
mail_storage_set_error(box->storage, MAIL_STORAGE_ERR_NO_PERMISSION);
return 0;
}
static int
acl_get_write_rights(struct mailbox *box,
bool *flags_r, bool *flag_seen_r, bool *flag_del_r)
{
int ret;
ret = mailbox_acl_right_lookup(box, ACL_STORAGE_RIGHT_WRITE);
if (ret < 0)
return -1;
*flags_r = ret > 0;
ret = mailbox_acl_right_lookup(box, ACL_STORAGE_RIGHT_WRITE_SEEN);
if (ret < 0)
return -1;
*flag_seen_r = ret > 0;
ret = mailbox_acl_right_lookup(box, ACL_STORAGE_RIGHT_WRITE_DELETED);
if (ret < 0)
return -1;
*flag_del_r = ret > 0;
return 1;
}
static int
acl_mail_update_flags(struct mail *_mail, enum modify_type modify_type,
enum mail_flags flags)
{
struct mail_private *mail = (struct mail_private *)_mail;
struct acl_mail *amail = ACL_CONTEXT(mail);
bool acl_flags, acl_flag_seen, acl_flag_del;
int ret;
ret = acl_get_write_rights(_mail->box, &acl_flags, &acl_flag_seen,
&acl_flag_del);
if (ret < 0)
return -1;
if (modify_type != MODIFY_REPLACE) {
/* adding/removing flags. just remove the disallowed
flags from the mask. */
if (!acl_flags)
flags &= MAIL_SEEN | MAIL_DELETED;
if (!acl_flag_seen)
flags &= ~MAIL_SEEN;
if (!acl_flag_del)
flags &= ~MAIL_DELETED;
} else if (!acl_flags || acl_flag_seen || !acl_flag_del) {
/* we don't have permission to replace all the flags. */
if (!acl_flags && !acl_flag_seen && !acl_flag_del) {
/* no flag changes allowed. ignore silently. */
return 0;
}
/* handle this by first removing the allowed flags and
then adding the allowed flags */
if (acl_mail_update_flags(_mail, MODIFY_REMOVE,
~flags) < 0)
return -1;
return acl_mail_update_flags(_mail, MODIFY_ADD, flags);
}
return amail->super.update_flags(_mail, modify_type, flags);
}
static int
acl_mail_update_keywords(struct mail *_mail, enum modify_type modify_type,
struct mail_keywords *keywords)
{
struct mail_private *mail = (struct mail_private *)_mail;
struct acl_mail *amail = ACL_CONTEXT(mail);
int ret;
ret = mailbox_acl_right_lookup(_mail->box, ACL_STORAGE_RIGHT_WRITE);
if (ret <= 0) {
/* if we don't have permission, just silently return success. */
return ret;
}
return amail->super.update_keywords(_mail, modify_type, keywords);
}
static int acl_mail_expunge(struct mail *_mail)
{
struct mail_private *mail = (struct mail_private *)_mail;
struct acl_mail *amail = ACL_CONTEXT(mail);
int ret;
ret = mailbox_acl_right_lookup(_mail->box, ACL_STORAGE_RIGHT_EXPUNGE);
if (ret <= 0) {
/* if we don't have permission, silently return success so
users won't see annoying error messages in case their
clients try automatic expunging. */
return ret;
}
return amail->super.expunge(_mail);
}
static struct mail *
acl_mail_alloc(struct mailbox_transaction_context *t,
enum mail_fetch_field wanted_fields,
struct mailbox_header_lookup_ctx *wanted_headers)
{
struct acl_mailbox *abox = ACL_CONTEXT(t->box);
struct acl_mail *amail;
struct mail *_mail;
struct mail_private *mail;
_mail = abox->super.mail_alloc(t, wanted_fields, wanted_headers);
mail = (struct mail_private *)_mail;
amail = p_new(mail->pool, struct acl_mail, 1);
amail->super = mail->v;
mail->v.update_flags = acl_mail_update_flags;
mail->v.update_keywords = acl_mail_update_keywords;
mail->v.expunge = acl_mail_expunge;
array_idx_set(&mail->module_contexts, acl_storage_module_id, &amail);
return _mail;
}
static int
acl_save_init(struct mailbox_transaction_context *t,
enum mail_flags flags, struct mail_keywords *keywords,
time_t received_date, int timezone_offset,
const char *from_envelope, struct istream *input,
bool want_mail, struct mail_save_context **ctx_r)
{
struct acl_mailbox *abox = ACL_CONTEXT(t->box);
if (mailbox_acl_right_lookup(t->box, ACL_STORAGE_RIGHT_INSERT) <= 0)
return -1;
return abox->super.save_init(t, flags, keywords, received_date,
timezone_offset, from_envelope,
input, want_mail, ctx_r);
}
static int
acl_copy(struct mailbox_transaction_context *t, struct mail *mail,
enum mail_flags flags, struct mail_keywords *keywords,
struct mail *dest_mail)
{
struct acl_mailbox *abox = ACL_CONTEXT(t->box);
if (mailbox_acl_right_lookup(t->box, ACL_STORAGE_RIGHT_INSERT) <= 0)
return -1;
return abox->super.copy(t, mail, flags, keywords, dest_mail);
}
struct mailbox *acl_mailbox_open_box(struct mailbox *box)
{
struct acl_mail_storage *astorage = ACL_CONTEXT(box->storage);
struct acl_mailbox *abox;
abox = p_new(box->pool, struct acl_mailbox, 1);
abox->super = box->v;
abox->aclobj = acl_object_init_from_name(astorage->backend,
mailbox_get_name(box));
box->v.close = acl_mailbox_close;
box->v.mail_alloc = acl_mail_alloc;
box->v.save_init = acl_save_init;
box->v.copy = acl_copy;
array_idx_set(&box->module_contexts, acl_storage_module_id, &abox);
return box;
}