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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
commitb5896ba9f6047e7031e2bdee0622d543e11a6734 (patch)
treefd7b460593a2fee1be579bec5697e6d887ea3421 /src/global/dict_proxy.c
parentInitial commit. (diff)
downloadpostfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.tar.xz
postfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.zip
Adding upstream version 3.4.23.upstream/3.4.23upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/global/dict_proxy.c')
-rw-r--r--src/global/dict_proxy.c512
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 */
+ }
+}