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-rw-r--r--source3/include/proto.h7
-rw-r--r--source3/include/smb.h6
-rw-r--r--source3/param/loadparm.c11
-rw-r--r--source3/smbd/conn.c1
-rw-r--r--source3/smbd/notify_inotify.c4
-rw-r--r--source3/smbd/process.c58
-rw-r--r--source3/smbd/service.c80
-rw-r--r--source3/smbd/uid.c96
8 files changed, 235 insertions, 28 deletions
diff --git a/source3/include/proto.h b/source3/include/proto.h
index 0dd1e98c86..d141de44cf 100644
--- a/source3/include/proto.h
+++ b/source3/include/proto.h
@@ -4296,6 +4296,7 @@ enum usershare_err parse_usershare_file(TALLOC_CTX *ctx,
char **pp_comment,
SEC_DESC **ppsd,
bool *pallow_guest);
+bool am_usershare(int iService);
int load_usershare_service(const char *servicename);
int load_usershare_shares(void);
void gfree_loadparm(void);
@@ -7063,7 +7064,8 @@ void reply_transs2(struct smb_request *req);
bool change_to_guest(void);
void conn_clear_vuid_cache(connection_struct *conn, uint16_t vuid);
-bool change_to_user(connection_struct *conn, uint16 vuid);
+bool change_to_user_force_recheck(connection_struct *conn, uint16 vuid,
+ bool recheck, NTSTATUS *pstatus);
bool change_to_root_user(void);
bool become_authenticated_pipe_user(pipes_struct *p);
bool unbecome_authenticated_pipe_user(void);
@@ -7072,6 +7074,9 @@ void unbecome_root(void);
bool become_user(connection_struct *conn, uint16 vuid);
bool unbecome_user(void);
+#define change_to_user(conn, vuid) \
+ change_to_user_force_recheck(conn, vuid, 0, NULL)
+
/* The following definitions come from smbd/utmp.c */
void sys_utmp_claim(const char *username, const char *hostname,
diff --git a/source3/include/smb.h b/source3/include/smb.h
index 2e9cf1b54a..44216f856a 100644
--- a/source3/include/smb.h
+++ b/source3/include/smb.h
@@ -550,6 +550,7 @@ typedef struct connection_struct {
unsigned cnum; /* an index passed over the wire */
struct share_params *params;
bool force_user;
+ bool force_recheck_perm;
struct vuid_cache vuid_cache;
struct dptr_struct *dirptr;
bool printer;
@@ -1398,6 +1399,11 @@ struct bitmap {
#define FILE_NOTIFY_CHANGE_STREAM_NAME 0x00000200
#define FILE_NOTIFY_CHANGE_STREAM_SIZE 0x00000400
#define FILE_NOTIFY_CHANGE_STREAM_WRITE 0x00000800
+#define FILE_NOTIFY_CHANGE_FILE_CONTENT \
+ (FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME \
+ | FILE_NOTIFY_CHANGE_ATTRIBUTES | FILE_NOTIFY_CHANGE_SIZE \
+ | FILE_NOTIFY_CHANGE_CREATION | FILE_NOTIFY_CHANGE_EA \
+ | FILE_NOTIFY_CHANGE_SECURITY)
#define FILE_NOTIFY_CHANGE_NAME \
(FILE_NOTIFY_CHANGE_FILE_NAME|FILE_NOTIFY_CHANGE_DIR_NAME)
diff --git a/source3/param/loadparm.c b/source3/param/loadparm.c
index 7e4371bf0b..7b4e363f1b 100644
--- a/source3/param/loadparm.c
+++ b/source3/param/loadparm.c
@@ -8727,6 +8727,17 @@ static int process_usershare_file(const char *dir_name, const char *file_name, i
}
/***************************************************************************
+Am I a usershare service?
+***************************************************************************/
+bool am_usershare(int iService)
+{
+ if (iService >= 0) {
+ return (ServicePtrs[iService]->usershare == USERSHARE_VALID);
+ }
+ return false;
+}
+
+/***************************************************************************
Checks if a usershare entry has been modified since last load.
***************************************************************************/
diff --git a/source3/smbd/conn.c b/source3/smbd/conn.c
index af6e0919a4..3ddb4c094f 100644
--- a/source3/smbd/conn.c
+++ b/source3/smbd/conn.c
@@ -155,6 +155,7 @@ find_again:
return NULL;
}
conn->cnum = i;
+ conn->force_recheck_perm = false;
conn->force_group_gid = (gid_t)-1;
bitmap_set(sconn->smb1.tcons.bmap, i);
diff --git a/source3/smbd/notify_inotify.c b/source3/smbd/notify_inotify.c
index 26570a2216..b6be69c8fd 100644
--- a/source3/smbd/notify_inotify.c
+++ b/source3/smbd/notify_inotify.c
@@ -316,7 +316,9 @@ static const struct {
{FILE_NOTIFY_CHANGE_LAST_WRITE, IN_ATTRIB},
{FILE_NOTIFY_CHANGE_LAST_ACCESS, IN_ATTRIB},
{FILE_NOTIFY_CHANGE_EA, IN_ATTRIB},
- {FILE_NOTIFY_CHANGE_SECURITY, IN_ATTRIB}
+ {FILE_NOTIFY_CHANGE_SECURITY, IN_ATTRIB},
+ {FILE_NOTIFY_CHANGE_FILE_CONTENT, IN_MODIFY|IN_DELETE|IN_CREATE|IN_DELETE_SELF
+ |IN_MOVE_SELF|IN_MOVED_FROM|IN_MOVED_TO},
};
static uint32_t inotify_map(struct notify_entry *e)
diff --git a/source3/smbd/process.c b/source3/smbd/process.c
index b26bc150db..5b8a325d22 100644
--- a/source3/smbd/process.c
+++ b/source3/smbd/process.c
@@ -1286,7 +1286,6 @@ static connection_struct *switch_message(uint8 type, struct smb_request *req, in
}
}
}
-
/* Does this call need to be run as the connected user? */
if (flags & AS_USER) {
@@ -1303,12 +1302,67 @@ static connection_struct *switch_message(uint8 type, struct smb_request *req, in
}
return NULL;
}
-
+#ifdef HAVE_INOTIFY
+ if (conn->force_recheck_perm) {
+ int old;
+ int iService = -1;
+ const char *service = NULL;
+ NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
+ conn->force_recheck_perm = false;
+ DEBUG(5, ("switch_message: rechecking permission for connection %x\n",
+ (unsigned int)conn));
+ old = SNUM(conn);
+ service = lp_servicename(old);
+ conn->read_only = False;
+ if (lp_snum_ok(old) && am_usershare(old)) {
+ iService = load_usershare_service(service);
+ if (iService < 0 || old != iService) {
+ /* non-exist service */
+ DEBUG(5, ("switch_message: deleting connection %x\n",
+ (unsigned int)conn));
+ DEBUG(5, ("snum %d, sname %s\n",
+ old, service ? service : "NULL"));
+ delete_share_security(service);
+ set_current_service(NULL, 0, True);
+ close_cnum(smbd_server_conn, conn, conn->vuid);
+ lp_killservice(old);
+ reply_nterror(req, NT_STATUS_BAD_NETWORK_NAME);
+ return NULL;
+ }
+
+ /*
+ * Don't have to reauthentication here, but
+ * need to check share permissions.....
+ * the vuid cache is a problem..
+ */
+
+ if (!change_to_root_user()) {
+ smb_panic("cann't change to root user!\n");
+ }
+
+ if (!change_to_user_force_recheck(conn, session_tag,
+ True, &status)) {
+ reply_nterror(req, status);
+ remove_deferred_open_smb_message(req->mid);
+ return conn;
+ }
+ }
+ } else {
+ NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
+ if (!change_to_user_force_recheck(conn, session_tag,
+ False, &status)) {
+ reply_nterror(req, status);
+ remove_deferred_open_smb_message(req->mid);
+ return conn;
+ }
+ }
+#else
if (!change_to_user(conn,session_tag)) {
reply_nterror(req, NT_STATUS_DOS(ERRSRV, ERRbaduid));
remove_deferred_open_smb_message(req->mid);
return conn;
}
+#endif
/* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */
diff --git a/source3/smbd/service.c b/source3/smbd/service.c
index 0124b2b047..8ae13b14f3 100644
--- a/source3/smbd/service.c
+++ b/source3/smbd/service.c
@@ -630,6 +630,33 @@ static NTSTATUS create_connection_server_info(struct smbd_server_connection *sco
return NT_STATUS_ACCESS_DENIED;
}
+#ifdef HAVE_INOTIFY
+static void share_perm_changed(struct sys_notify_context *ctx,
+ void *ptr, struct notify_event *ev)
+{
+ connection_struct *conn = talloc_get_type_abort(ptr, connection_struct);
+ const char *service = NULL;
+ service = lp_servicename(SNUM(conn));
+ if (strequal(ev->path, service)) {
+ conn->force_recheck_perm = true;
+ DEBUG(0, ("share_perm_changed: set recheck flag for connection %x\n",
+ (unsigned int)conn));
+ }
+}
+
+struct notify_context {
+ struct db_context *db_recursive;
+ struct db_context *db_onelevel;
+ struct server_id server;
+ struct messaging_context *messaging_ctx;
+ struct notify_list *list;
+ struct notify_array *array;
+ int seqnum;
+ struct sys_notify_context *sys_notify_ctx;
+ TDB_DATA key;
+};
+#endif
+
/****************************************************************************
Make a connection, given the snum to connect to, and the vuser of the
@@ -867,11 +894,64 @@ connection_struct *make_connection_snum(struct smbd_server_connection *sconn,
}
if ((!conn->printer) && (!conn->ipc)) {
+#ifdef HAVE_INOTIFY
+ struct sys_notify_context *sys_ctx = NULL;
+ struct notify_entry e;
+ struct inotify_watch_context *w = NULL;
+#endif
conn->notify_ctx = notify_init(conn, server_id_self(),
smbd_messaging_context(),
smbd_event_context(),
conn);
+#ifdef HAVE_INOTIFY
+ /*
+ * here is the start of monitoring share permissions change.
+ * For usershares, we have to watch on both
+ * get_dyn_STATDIR()/servicename and get_dyn_STATDIR()/share_info.tdb.
+ * For shares in smb.conf, we just watch on
+ * get_dyn_STATDIR()/share_info.tdb
+ */
+ if (!conn->notify_ctx) {
+ DEBUG(1, ("change notify is not enabled??\n"));
+ goto nonotify;
+ }
+ sys_ctx = conn->notify_ctx->sys_notify_ctx;
+ if (!sys_ctx) {
+ DEBUG(1, ("change notify: out of memory!!\n"));
+ *pstatus = NT_STATUS_NO_MEMORY;
+ conn_free(sconn, conn);
+ return NULL;
+ }
+ ZERO_STRUCT(e);
+ if (am_usershare(SNUM(conn))) {
+ const char *usershare_path = lp_usershare_path();
+ /* This is usershare service. */
+ e.path = talloc_strdup(conn, usershare_path);
+ } else {
+ goto nonotify;
+ /* watch normal shares' permission? */
+ }
+ if (!e.path) {
+ DEBUG(1, ("setting up usershare notify: out of memory!\n"));
+ *pstatus = status;
+ conn_free(sconn, conn);
+ return NULL;
+ }
+ e.path_len = strlen(e.path);
+ e.filter = FILE_NOTIFY_CHANGE_FILE_CONTENT;
+ status = inotify_watch(sys_ctx, &e, share_perm_changed,
+ (void *)conn, (void *)&w);
+ if (NT_STATUS_IS_ERR(status)) {
+ DEBUG(1, ("add inotify for usershare permission failed!\n"));
+ *pstatus = status;
+ conn_free(sconn, conn);
+ return NULL;
+ }
+#endif
}
+#ifdef HAVE_INOTIFY
+nonotify:
+#endif
/* ROOT Activities: */
/*
diff --git a/source3/smbd/uid.c b/source3/smbd/uid.c
index 2ec50cd4d8..8e5a386a2d 100644
--- a/source3/smbd/uid.c
+++ b/source3/smbd/uid.c
@@ -82,12 +82,17 @@ static void free_conn_server_info_if_unused(connection_struct *conn)
static bool check_user_ok(connection_struct *conn,
uint16_t vuid,
const struct auth_serversupplied_info *server_info,
- int snum)
+ int snum, bool recheck, NTSTATUS *pstatus)
{
bool valid_vuid = (vuid != UID_FIELD_INVALID);
unsigned int i;
bool readonly_share;
bool admin_user;
+ struct vuid_cache_entry *ent0;
+
+ if (pstatus) {
+ *pstatus = NT_STATUS_OK;
+ }
if (valid_vuid) {
struct vuid_cache_entry *ent;
@@ -96,18 +101,27 @@ static bool check_user_ok(connection_struct *conn,
ent = &conn->vuid_cache.array[i];
if (ent->vuid == vuid) {
free_conn_server_info_if_unused(conn);
- conn->server_info = ent->server_info;
- conn->read_only = ent->read_only;
- conn->admin_user = ent->admin_user;
- return(True);
+ ent0 = ent;
+ if (!recheck) {
+ conn->server_info = ent->server_info;
+ conn->read_only = ent->read_only;
+ conn->admin_user = ent->admin_user;
+ return(True);
+ } else {
+ break;
+ }
}
}
}
if (!user_ok_token(server_info->unix_name,
pdb_get_domain(server_info->sam_account),
- server_info->ptok, snum))
+ server_info->ptok, snum)) {
+ if (pstatus) {
+ *pstatus = NT_STATUS_ACCESS_DENIED;
+ }
return(False);
+ }
readonly_share = is_share_read_only_for_token(
server_info->unix_name,
@@ -128,6 +142,9 @@ static bool check_user_ok(connection_struct *conn,
if (!share_access_check(server_info->ptok, lp_servicename(snum),
readonly_share ?
FILE_READ_DATA : FILE_WRITE_DATA)) {
+ if (pstatus) {
+ *pstatus = NT_STATUS_ACCESS_DENIED;
+ }
return False;
}
@@ -137,13 +154,26 @@ static bool check_user_ok(connection_struct *conn,
NULL, server_info->ptok, lp_admin_users(snum));
if (valid_vuid) {
- struct vuid_cache_entry *ent =
- &conn->vuid_cache.array[conn->vuid_cache.next_entry];
+ struct vuid_cache_entry *ent = NULL;
+
+ if (!recheck || i == VUID_CACHE_SIZE) {
+ /* find a new entry and fill it. */
+ ent = &conn->vuid_cache.array[conn->vuid_cache.next_entry];
- conn->vuid_cache.next_entry =
- (conn->vuid_cache.next_entry + 1) % VUID_CACHE_SIZE;
+ conn->vuid_cache.next_entry =
+ (conn->vuid_cache.next_entry + 1) % VUID_CACHE_SIZE;
- TALLOC_FREE(ent->server_info);
+ TALLOC_FREE(ent->server_info);
+ } else if (recheck && (i < VUID_CACHE_SIZE) && (ent0->vuid == vuid)) {
+ /* she perform forced recheck, replace the old one. */
+ ent = ent0;
+ } else {
+ /* must not happen */
+ DEBUG(0, ("check_user_ok: recheck %s\n", recheck ? "true" : "false"));
+ DEBUG(0, ("check_user_ok: vuid cache %d -- %d\n", i, VUID_CACHE_SIZE));
+ DEBUG(0, ("check_user_ok: vuid %d -- %d\n", ent0->vuid, vuid));
+ smb_panic("should not happen");
+ }
/*
* If force_user was set, all server_info's are based on the same
@@ -155,6 +185,9 @@ static bool check_user_ok(connection_struct *conn,
if (ent->server_info == NULL) {
ent->vuid = UID_FIELD_INVALID;
+ if (pstatus) {
+ *pstatus = NT_STATUS_NO_MEMORY;
+ }
return false;
}
@@ -221,7 +254,8 @@ void conn_clear_vuid_cache(connection_struct *conn, uint16_t vuid)
stack, but modify the current_user entries.
****************************************************************************/
-bool change_to_user(connection_struct *conn, uint16 vuid)
+bool change_to_user_force_recheck(connection_struct *conn, uint16 vuid,
+ bool recheck, NTSTATUS *pstatus)
{
const struct auth_serversupplied_info *server_info = NULL;
struct smbd_server_connection *sconn = smbd_server_conn;
@@ -235,6 +269,9 @@ bool change_to_user(connection_struct *conn, uint16 vuid)
if (!conn) {
DEBUG(2,("change_to_user: Connection not open\n"));
+ if (pstatus) {
+ *pstatus = NT_STATUS_INVALID_HANDLE;
+ }
return(False);
}
@@ -245,17 +282,19 @@ bool change_to_user(connection_struct *conn, uint16 vuid)
* SMB's - this hurts performance - Badly.
*/
- if((lp_security() == SEC_SHARE) && (current_user.conn == conn) &&
- (current_user.ut.uid == conn->server_info->utok.uid)) {
- DEBUG(4,("change_to_user: Skipping user change - already "
- "user\n"));
- return(True);
- } else if ((current_user.conn == conn) &&
- (vuser != NULL) && (current_user.vuid == vuid) &&
- (current_user.ut.uid == vuser->server_info->utok.uid)) {
- DEBUG(4,("change_to_user: Skipping user change - already "
- "user\n"));
- return(True);
+ if (!recheck) {
+ if((lp_security() == SEC_SHARE) && (current_user.conn == conn) &&
+ (current_user.ut.uid == conn->server_info->utok.uid)) {
+ DEBUG(4,("change_to_user: Skipping user change - already "
+ "user\n"));
+ return(True);
+ } else if ((current_user.conn == conn) &&
+ (vuser != NULL) && (current_user.vuid == vuid) &&
+ (current_user.ut.uid == vuser->server_info->utok.uid)) {
+ DEBUG(4,("change_to_user: Skipping user change - already "
+ "user\n"));
+ return(True);
+ }
}
snum = SNUM(conn);
@@ -266,10 +305,13 @@ bool change_to_user(connection_struct *conn, uint16 vuid)
/* Invalid vuid sent - even with security = share. */
DEBUG(2,("change_to_user: Invalid vuid %d used on "
"share %s.\n",vuid, lp_servicename(snum) ));
+ if (pstatus) {
+ *pstatus = NT_STATUS_ACCESS_VIOLATION;
+ }
return false;
}
- if (!check_user_ok(conn, vuid, server_info, snum)) {
+ if (!check_user_ok(conn, vuid, server_info, snum, recheck, pstatus)) {
DEBUG(2,("change_to_user: SMB user %s (unix user %s, vuid %d) "
"not permitted access to share %s.\n",
server_info->sanitized_username,
@@ -296,6 +338,9 @@ bool change_to_user(connection_struct *conn, uint16 vuid)
} else {
DEBUG(2,("change_to_user: Invalid vuid used %d in accessing "
"share %s.\n",vuid, lp_servicename(snum) ));
+ if (pstatus) {
+ *pstatus = NT_STATUS_DOS(ERRSRV, ERRbaduid);
+ }
return False;
}
@@ -353,6 +398,9 @@ bool change_to_user(connection_struct *conn, uint16 vuid)
DEBUG(5,("change_to_user uid=(%d,%d) gid=(%d,%d)\n",
(int)getuid(),(int)geteuid(),(int)getgid(),(int)getegid()));
+ if (pstatus) {
+ *pstatus = NT_STATUS_OK;
+ }
return(True);
}
generated by cgit (git 2.34.1) at 2024-12-01 20:33:32 +0000