Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 512 insertions, 0 deletions

diff --git a/src/global/dict_proxy.c b/src/global/dict_proxy.c
new file mode 100644
index 0000000..924c62d
--- /dev/null
+++ b/src/global/dict_proxy.c
@@ -0,0 +1,512 @@
+/*++
+/* NAME
+/*	dict_proxy 3
+/* SUMMARY
+/*	generic dictionary proxy client
+/* SYNOPSIS
+/*	#include <dict_proxy.h>
+/*
+/*	DICT	*dict_proxy_open(map, open_flags, dict_flags)
+/*	const char *map;
+/*	int	open_flags;
+/*	int	dict_flags;
+/* DESCRIPTION
+/*	dict_proxy_open() relays read-only or read-write operations
+/*	through the Postfix proxymap server.
+/*
+/*	The \fIopen_flags\fR argument must specify O_RDONLY
+/*	or O_RDWR. Depending on this, the client
+/*	connects to the proxymap multiserver or to the
+/*	proxywrite single updater.
+/*
+/*	The connection to the Postfix proxymap server is automatically
+/*	closed after $ipc_idle seconds of idle time, or after $ipc_ttl
+/*	seconds of activity.
+/* SECURITY
+/*	The proxy map server is not meant to be a trusted process. Proxy
+/*	maps must not be used to look up security sensitive information
+/*	such as user/group IDs, output files, or external commands.
+/* SEE ALSO
+/*	dict(3) generic dictionary manager
+/*	clnt_stream(3) client endpoint connection management
+/* DIAGNOSTICS
+/*	Fatal errors: out of memory, unimplemented operation,
+/*	bad request parameter, map not approved for proxy access.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <errno.h>
+#include <unistd.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <stringops.h>
+#include <vstring.h>
+#include <vstream.h>
+#include <attr.h>
+#include <dict.h>
+
+/* Global library. */
+
+#include <mail_proto.h>
+#include <mail_params.h>
+#include <clnt_stream.h>
+#include <dict_proxy.h>
+
+/* Application-specific. */
+
+typedef struct {
+    DICT    dict;			/* generic members */
+    CLNT_STREAM *clnt;			/* client handle (shared) */
+    const char *service;		/* service name */
+    int     inst_flags;			/* saved dict flags */
+    VSTRING *reskey;			/* result key storage */
+    VSTRING *result;			/* storage */
+} DICT_PROXY;
+
+ /*
+  * SLMs.
+  */
+#define STR(x)		vstring_str(x)
+#define VSTREQ(v,s)	(strcmp(STR(v),s) == 0)
+
+ /*
+  * All proxied maps of the same type share the same query/reply socket.
+  */
+static CLNT_STREAM *proxymap_stream;	/* read-only maps */
+static CLNT_STREAM *proxywrite_stream;	/* read-write maps */
+
+/* dict_proxy_sequence - find first/next entry */
+
+static int dict_proxy_sequence(DICT *dict, int function,
+			               const char **key, const char **value)
+{
+    const char *myname = "dict_proxy_sequence";
+    DICT_PROXY *dict_proxy = (DICT_PROXY *) dict;
+    VSTREAM *stream;
+    int     status;
+    int     count = 0;
+    int     request_flags;
+
+    /*
+     * The client and server live in separate processes that may start and
+     * terminate independently. We cannot rely on a persistent connection,
+     * let alone on persistent state (such as a specific open table) that is
+     * associated with a specific connection. Each lookup needs to specify
+     * the table and the flags that were specified to dict_proxy_open().
+     */
+    VSTRING_RESET(dict_proxy->reskey);
+    VSTRING_TERMINATE(dict_proxy->reskey);
+    VSTRING_RESET(dict_proxy->result);
+    VSTRING_TERMINATE(dict_proxy->result);
+    request_flags = dict_proxy->inst_flags
+	| (dict->flags & DICT_FLAG_RQST_MASK);
+    for (;;) {
+	stream = clnt_stream_access(dict_proxy->clnt);
+	errno = 0;
+	count += 1;
+	if (attr_print(stream, ATTR_FLAG_NONE,
+		       SEND_ATTR_STR(MAIL_ATTR_REQ, PROXY_REQ_SEQUENCE),
+		       SEND_ATTR_STR(MAIL_ATTR_TABLE, dict->name),
+		       SEND_ATTR_INT(MAIL_ATTR_FLAGS, request_flags),
+		       SEND_ATTR_INT(MAIL_ATTR_FUNC, function),
+		       ATTR_TYPE_END) != 0
+	    || vstream_fflush(stream)
+	    || attr_scan(stream, ATTR_FLAG_STRICT,
+			 RECV_ATTR_INT(MAIL_ATTR_STATUS, &status),
+			 RECV_ATTR_STR(MAIL_ATTR_KEY, dict_proxy->reskey),
+			 RECV_ATTR_STR(MAIL_ATTR_VALUE, dict_proxy->result),
+			 ATTR_TYPE_END) != 3) {
+	    if (msg_verbose || count > 1 || (errno && errno != EPIPE && errno != ENOENT))
+		msg_warn("%s: service %s: %m", myname, VSTREAM_PATH(stream));
+	} else {
+	    if (msg_verbose)
+		msg_info("%s: table=%s flags=%s func=%d -> status=%d key=%s val=%s",
+			 myname, dict->name, dict_flags_str(request_flags),
+			 function, status, STR(dict_proxy->reskey),
+			 STR(dict_proxy->result));
+	    switch (status) {
+	    case PROXY_STAT_BAD:
+		msg_fatal("%s sequence failed for table \"%s\" function %d: "
+			  "invalid request",
+			  dict_proxy->service, dict->name, function);
+	    case PROXY_STAT_DENY:
+		msg_fatal("%s service is not configured for table \"%s\"",
+			  dict_proxy->service, dict->name);
+	    case PROXY_STAT_OK:
+		*key = STR(dict_proxy->reskey);
+		*value = STR(dict_proxy->result);
+		DICT_ERR_VAL_RETURN(dict, DICT_ERR_NONE, DICT_STAT_SUCCESS);
+	    case PROXY_STAT_NOKEY:
+		*key = *value = 0;
+		DICT_ERR_VAL_RETURN(dict, DICT_ERR_NONE, DICT_STAT_FAIL);
+	    case PROXY_STAT_RETRY:
+		*key = *value = 0;
+		DICT_ERR_VAL_RETURN(dict, DICT_ERR_RETRY, DICT_STAT_ERROR);
+	    case PROXY_STAT_CONFIG:
+		*key = *value = 0;
+		DICT_ERR_VAL_RETURN(dict, DICT_ERR_CONFIG, DICT_STAT_ERROR);
+	    default:
+		msg_warn("%s sequence failed for table \"%s\" function %d: "
+			 "unexpected reply status %d",
+			 dict_proxy->service, dict->name, function, status);
+	    }
+	}
+	clnt_stream_recover(dict_proxy->clnt);
+	sleep(1);				/* XXX make configurable */
+    }
+}
+
+/* dict_proxy_lookup - find table entry */
+
+static const char *dict_proxy_lookup(DICT *dict, const char *key)
+{
+    const char *myname = "dict_proxy_lookup";
+    DICT_PROXY *dict_proxy = (DICT_PROXY *) dict;
+    VSTREAM *stream;
+    int     status;
+    int     count = 0;
+    int     request_flags;
+
+    /*
+     * The client and server live in separate processes that may start and
+     * terminate independently. We cannot rely on a persistent connection,
+     * let alone on persistent state (such as a specific open table) that is
+     * associated with a specific connection. Each lookup needs to specify
+     * the table and the flags that were specified to dict_proxy_open().
+     */
+    VSTRING_RESET(dict_proxy->result);
+    VSTRING_TERMINATE(dict_proxy->result);
+    request_flags = dict_proxy->inst_flags
+	| (dict->flags & DICT_FLAG_RQST_MASK);
+    for (;;) {
+	stream = clnt_stream_access(dict_proxy->clnt);
+	errno = 0;
+	count += 1;
+	if (attr_print(stream, ATTR_FLAG_NONE,
+		       SEND_ATTR_STR(MAIL_ATTR_REQ, PROXY_REQ_LOOKUP),
+		       SEND_ATTR_STR(MAIL_ATTR_TABLE, dict->name),
+		       SEND_ATTR_INT(MAIL_ATTR_FLAGS, request_flags),
+		       SEND_ATTR_STR(MAIL_ATTR_KEY, key),
+		       ATTR_TYPE_END) != 0
+	    || vstream_fflush(stream)
+	    || attr_scan(stream, ATTR_FLAG_STRICT,
+			 RECV_ATTR_INT(MAIL_ATTR_STATUS, &status),
+			 RECV_ATTR_STR(MAIL_ATTR_VALUE, dict_proxy->result),
+			 ATTR_TYPE_END) != 2) {
+	    if (msg_verbose || count > 1 || (errno && errno != EPIPE && errno != ENOENT))
+		msg_warn("%s: service %s: %m", myname, VSTREAM_PATH(stream));
+	} else {
+	    if (msg_verbose)
+		msg_info("%s: table=%s flags=%s key=%s -> status=%d result=%s",
+			 myname, dict->name,
+			 dict_flags_str(request_flags), key,
+			 status, STR(dict_proxy->result));
+	    switch (status) {
+	    case PROXY_STAT_BAD:
+		msg_fatal("%s lookup failed for table \"%s\" key \"%s\": "
+			  "invalid request",
+			  dict_proxy->service, dict->name, key);
+	    case PROXY_STAT_DENY:
+		msg_fatal("%s service is not configured for table \"%s\"",
+			  dict_proxy->service, dict->name);
+	    case PROXY_STAT_OK:
+		DICT_ERR_VAL_RETURN(dict, DICT_ERR_NONE, STR(dict_proxy->result));
+	    case PROXY_STAT_NOKEY:
+		DICT_ERR_VAL_RETURN(dict, DICT_ERR_NONE, (char *) 0);
+	    case PROXY_STAT_RETRY:
+		DICT_ERR_VAL_RETURN(dict, DICT_ERR_RETRY, (char *) 0);
+	    case PROXY_STAT_CONFIG:
+		DICT_ERR_VAL_RETURN(dict, DICT_ERR_CONFIG, (char *) 0);
+	    default:
+		msg_warn("%s lookup failed for table \"%s\" key \"%s\": "
+			 "unexpected reply status %d",
+			 dict_proxy->service, dict->name, key, status);
+	    }
+	}
+	clnt_stream_recover(dict_proxy->clnt);
+	sleep(1);				/* XXX make configurable */
+    }
+}
+
+/* dict_proxy_update - update table entry */
+
+static int dict_proxy_update(DICT *dict, const char *key, const char *value)
+{
+    const char *myname = "dict_proxy_update";
+    DICT_PROXY *dict_proxy = (DICT_PROXY *) dict;
+    VSTREAM *stream;
+    int     status;
+    int     count = 0;
+    int     request_flags;
+
+    /*
+     * The client and server live in separate processes that may start and
+     * terminate independently. We cannot rely on a persistent connection,
+     * let alone on persistent state (such as a specific open table) that is
+     * associated with a specific connection. Each lookup needs to specify
+     * the table and the flags that were specified to dict_proxy_open().
+     */
+    request_flags = dict_proxy->inst_flags
+	| (dict->flags & DICT_FLAG_RQST_MASK);
+    for (;;) {
+	stream = clnt_stream_access(dict_proxy->clnt);
+	errno = 0;
+	count += 1;
+	if (attr_print(stream, ATTR_FLAG_NONE,
+		       SEND_ATTR_STR(MAIL_ATTR_REQ, PROXY_REQ_UPDATE),
+		       SEND_ATTR_STR(MAIL_ATTR_TABLE, dict->name),
+		       SEND_ATTR_INT(MAIL_ATTR_FLAGS, request_flags),
+		       SEND_ATTR_STR(MAIL_ATTR_KEY, key),
+		       SEND_ATTR_STR(MAIL_ATTR_VALUE, value),
+		       ATTR_TYPE_END) != 0
+	    || vstream_fflush(stream)
+	    || attr_scan(stream, ATTR_FLAG_STRICT,
+			 RECV_ATTR_INT(MAIL_ATTR_STATUS, &status),
+			 ATTR_TYPE_END) != 1) {
+	    if (msg_verbose || count > 1 || (errno && errno != EPIPE && errno != ENOENT))
+		msg_warn("%s: service %s: %m", myname, VSTREAM_PATH(stream));
+	} else {
+	    if (msg_verbose)
+		msg_info("%s: table=%s flags=%s key=%s value=%s -> status=%d",
+			 myname, dict->name, dict_flags_str(request_flags),
+			 key, value, status);
+	    switch (status) {
+	    case PROXY_STAT_BAD:
+		msg_fatal("%s update failed for table \"%s\" key \"%s\": "
+			  "invalid request",
+			  dict_proxy->service, dict->name, key);
+	    case PROXY_STAT_DENY:
+		msg_fatal("%s update access is not configured for table \"%s\"",
+			  dict_proxy->service, dict->name);
+	    case PROXY_STAT_OK:
+		DICT_ERR_VAL_RETURN(dict, DICT_ERR_NONE, DICT_STAT_SUCCESS);
+	    case PROXY_STAT_NOKEY:
+		DICT_ERR_VAL_RETURN(dict, DICT_ERR_NONE, DICT_STAT_FAIL);
+	    case PROXY_STAT_RETRY:
+		DICT_ERR_VAL_RETURN(dict, DICT_ERR_RETRY, DICT_STAT_ERROR);
+	    case PROXY_STAT_CONFIG:
+		DICT_ERR_VAL_RETURN(dict, DICT_ERR_CONFIG, DICT_STAT_ERROR);
+	    default:
+		msg_warn("%s update failed for table \"%s\" key \"%s\": "
+			 "unexpected reply status %d",
+			 dict_proxy->service, dict->name, key, status);
+	    }
+	}
+	clnt_stream_recover(dict_proxy->clnt);
+	sleep(1);				/* XXX make configurable */
+    }
+}
+
+/* dict_proxy_delete - delete table entry */
+
+static int dict_proxy_delete(DICT *dict, const char *key)
+{
+    const char *myname = "dict_proxy_delete";
+    DICT_PROXY *dict_proxy = (DICT_PROXY *) dict;
+    VSTREAM *stream;
+    int     status;
+    int     count = 0;
+    int     request_flags;
+
+    /*
+     * The client and server live in separate processes that may start and
+     * terminate independently. We cannot rely on a persistent connection,
+     * let alone on persistent state (such as a specific open table) that is
+     * associated with a specific connection. Each lookup needs to specify
+     * the table and the flags that were specified to dict_proxy_open().
+     */
+    request_flags = dict_proxy->inst_flags
+	| (dict->flags & DICT_FLAG_RQST_MASK);
+    for (;;) {
+	stream = clnt_stream_access(dict_proxy->clnt);
+	errno = 0;
+	count += 1;
+	if (attr_print(stream, ATTR_FLAG_NONE,
+		       SEND_ATTR_STR(MAIL_ATTR_REQ, PROXY_REQ_DELETE),
+		       SEND_ATTR_STR(MAIL_ATTR_TABLE, dict->name),
+		       SEND_ATTR_INT(MAIL_ATTR_FLAGS, request_flags),
+		       SEND_ATTR_STR(MAIL_ATTR_KEY, key),
+		       ATTR_TYPE_END) != 0
+	    || vstream_fflush(stream)
+	    || attr_scan(stream, ATTR_FLAG_STRICT,
+			 RECV_ATTR_INT(MAIL_ATTR_STATUS, &status),
+			 ATTR_TYPE_END) != 1) {
+	    if (msg_verbose || count > 1 || (errno && errno != EPIPE && errno !=
+					     ENOENT))
+		msg_warn("%s: service %s: %m", myname, VSTREAM_PATH(stream));
+	} else {
+	    if (msg_verbose)
+		msg_info("%s: table=%s flags=%s key=%s -> status=%d",
+			 myname, dict->name, dict_flags_str(request_flags),
+			 key, status);
+	    switch (status) {
+	    case PROXY_STAT_BAD:
+		msg_fatal("%s delete failed for table \"%s\" key \"%s\": "
+			  "invalid request",
+			  dict_proxy->service, dict->name, key);
+	    case PROXY_STAT_DENY:
+		msg_fatal("%s update access is not configured for table \"%s\"",
+			  dict_proxy->service, dict->name);
+	    case PROXY_STAT_OK:
+		DICT_ERR_VAL_RETURN(dict, DICT_ERR_NONE, DICT_STAT_SUCCESS);
+	    case PROXY_STAT_NOKEY:
+		DICT_ERR_VAL_RETURN(dict, DICT_ERR_NONE, DICT_STAT_FAIL);
+	    case PROXY_STAT_RETRY:
+		DICT_ERR_VAL_RETURN(dict, DICT_ERR_RETRY, DICT_STAT_ERROR);
+	    case PROXY_STAT_CONFIG:
+		DICT_ERR_VAL_RETURN(dict, DICT_ERR_CONFIG, DICT_STAT_ERROR);
+	    default:
+		msg_warn("%s delete failed for table \"%s\" key \"%s\": "
+			 "unexpected reply status %d",
+			 dict_proxy->service, dict->name, key, status);
+	    }
+	}
+	clnt_stream_recover(dict_proxy->clnt);
+	sleep(1);				/* XXX make configurable */
+    }
+}
+
+/* dict_proxy_close - disconnect */
+
+static void dict_proxy_close(DICT *dict)
+{
+    DICT_PROXY *dict_proxy = (DICT_PROXY *) dict;
+
+    vstring_free(dict_proxy->reskey);
+    vstring_free(dict_proxy->result);
+    dict_free(dict);
+}
+
+/* dict_proxy_open - open remote map */
+
+DICT   *dict_proxy_open(const char *map, int open_flags, int dict_flags)
+{
+    const char *myname = "dict_proxy_open";
+    DICT_PROXY *dict_proxy;
+    VSTREAM *stream;
+    int     server_flags;
+    int     status;
+    const char *service;
+    char   *relative_path;
+    char   *kludge = 0;
+    char   *prefix;
+    CLNT_STREAM **pstream;
+
+    /*
+     * If this map can't be proxied then we silently do a direct open. This
+     * allows sites to benefit from proxying the virtual mailbox maps without
+     * unnecessary pain.
+     */
+    if (dict_flags & DICT_FLAG_NO_PROXY)
+	return (dict_open(map, open_flags, dict_flags));
+
+    /*
+     * Use a shared stream for proxied table lookups of the same type.
+     * 
+     * XXX A complete implementation would also allow O_RDWR without O_CREAT.
+     * But we must not pass on every possible set of flags to the proxy
+     * server; only sets that make sense. For now, the flags are passed
+     * implicitly by choosing between the proxymap or proxywrite service.
+     * 
+     * XXX Use absolute pathname to make this work from non-daemon processes.
+     */
+    if (open_flags == O_RDONLY) {
+	pstream = &proxymap_stream;
+	service = var_proxymap_service;
+    } else if ((open_flags & O_RDWR) == O_RDWR) {
+	pstream = &proxywrite_stream;
+	service = var_proxywrite_service;
+    } else
+	msg_fatal("%s: %s map open requires O_RDONLY or O_RDWR mode",
+		  map, DICT_TYPE_PROXY);
+
+    if (*pstream == 0) {
+	relative_path = concatenate(MAIL_CLASS_PRIVATE "/",
+				    service, (char *) 0);
+	if (access(relative_path, F_OK) == 0)
+	    prefix = MAIL_CLASS_PRIVATE;
+	else
+	    prefix = kludge = concatenate(var_queue_dir, "/",
+					  MAIL_CLASS_PRIVATE, (char *) 0);
+	*pstream = clnt_stream_create(prefix, service, var_ipc_idle_limit,
+				      var_ipc_ttl_limit);
+	if (kludge)
+	    myfree(kludge);
+	myfree(relative_path);
+    }
+
+    /*
+     * Local initialization.
+     */
+    dict_proxy = (DICT_PROXY *)
+	dict_alloc(DICT_TYPE_PROXY, map, sizeof(*dict_proxy));
+    dict_proxy->dict.lookup = dict_proxy_lookup;
+    dict_proxy->dict.update = dict_proxy_update;
+    dict_proxy->dict.delete = dict_proxy_delete;
+    dict_proxy->dict.sequence = dict_proxy_sequence;
+    dict_proxy->dict.close = dict_proxy_close;
+    dict_proxy->inst_flags = (dict_flags & DICT_FLAG_INST_MASK);
+    dict_proxy->reskey = vstring_alloc(10);
+    dict_proxy->result = vstring_alloc(10);
+    dict_proxy->clnt = *pstream;
+    dict_proxy->service = service;
+
+    /*
+     * Establish initial contact and get the map type specific flags.
+     * 
+     * XXX Should retrieve flags from local instance.
+     */
+    for (;;) {
+	stream = clnt_stream_access(dict_proxy->clnt);
+	errno = 0;
+	if (attr_print(stream, ATTR_FLAG_NONE,
+		       SEND_ATTR_STR(MAIL_ATTR_REQ, PROXY_REQ_OPEN),
+		       SEND_ATTR_STR(MAIL_ATTR_TABLE, dict_proxy->dict.name),
+		     SEND_ATTR_INT(MAIL_ATTR_FLAGS, dict_proxy->inst_flags),
+		       ATTR_TYPE_END) != 0
+	    || vstream_fflush(stream)
+	    || attr_scan(stream, ATTR_FLAG_STRICT,
+			 RECV_ATTR_INT(MAIL_ATTR_STATUS, &status),
+			 RECV_ATTR_INT(MAIL_ATTR_FLAGS, &server_flags),
+			 ATTR_TYPE_END) != 2) {
+	    if (msg_verbose || (errno != EPIPE && errno != ENOENT))
+		msg_warn("%s: service %s: %m", VSTREAM_PATH(stream), myname);
+	} else {
+	    if (msg_verbose)
+		msg_info("%s: connect to map=%s status=%d server_flags=%s",
+			 myname, dict_proxy->dict.name, status,
+			 dict_flags_str(server_flags));
+	    switch (status) {
+	    case PROXY_STAT_BAD:
+		msg_fatal("%s open failed for table \"%s\": invalid request",
+			  dict_proxy->service, dict_proxy->dict.name);
+	    case PROXY_STAT_DENY:
+		msg_fatal("%s service is not configured for table \"%s\"",
+			  dict_proxy->service, dict_proxy->dict.name);
+	    case PROXY_STAT_OK:
+		dict_proxy->dict.flags = (dict_flags & ~DICT_FLAG_IMPL_MASK)
+		    | (server_flags & DICT_FLAG_IMPL_MASK);
+		return (DICT_DEBUG (&dict_proxy->dict));
+	    default:
+		msg_warn("%s open failed for table \"%s\": unexpected status %d",
+			 dict_proxy->service, dict_proxy->dict.name, status);
+	    }
+	}
+	clnt_stream_recover(dict_proxy->clnt);
+	sleep(1);				/* XXX make configurable */
+    }
+}