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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/mail_conf.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/mail_conf.c')
-rw-r--r--src/global/mail_conf.c278
1 files changed, 278 insertions, 0 deletions
diff --git a/src/global/mail_conf.c b/src/global/mail_conf.c
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+/*++
+/* NAME
+/* mail_conf 3
+/* SUMMARY
+/* global configuration parameter management
+/* SYNOPSIS
+/* #include <mail_conf.h>
+/*
+/* void mail_conf_read()
+/*
+/* void mail_conf_suck()
+/*
+/* void mail_conf_flush()
+/*
+/* void mail_conf_checkdir(config_dir)
+/* const char *config_dir;
+/*
+/* void mail_conf_update(name, value)
+/* const char *name;
+/* const char *value;
+/*
+/* const char *mail_conf_lookup(name)
+/* const char *name;
+/*
+/* const char *mail_conf_eval(string)
+/* const char *string;
+/*
+/* const char *mail_conf_eval_once(string)
+/* const char *string;
+/*
+/* const char *mail_conf_lookup_eval(name)
+/* const char *name;
+/* DESCRIPTION
+/* mail_conf_suck() reads the global Postfix configuration
+/* file, and stores its values into a global configuration
+/* dictionary. When the configuration directory name is not
+/* trusted, this function requires that the directory name is
+/* authorized with the alternate_config_directories setting
+/* in the default main.cf file.
+/*
+/* This function requires that all configuration directory
+/* override mechanisms set the MAIL_CONFIG environment variable,
+/* even if the override was specified via the command line.
+/* This reduces the number of pathways that need to be checked
+/* for possible security attacks.
+/*
+/* mail_conf_read() invokes mail_conf_suck() and assigns the values
+/* to global variables by calling mail_params_init().
+/*
+/* mail_conf_flush() discards the global configuration dictionary.
+/* This is needed in programs that read main.cf multiple times, to
+/* ensure that deleted parameter settings are handled properly.
+/*
+/* mail_conf_checkdir() verifies that configuration directory
+/* is authorized through settings in the default main.cf file,
+/* and terminates the program if it is not.
+/*
+/* The following routines are wrappers around the generic dictionary
+/* access routines.
+/*
+/* mail_conf_update() updates the named global parameter. This has
+/* no effect on parameters whose value has already been looked up.
+/* The update succeeds or the program terminates with fatal error.
+/*
+/* mail_conf_lookup() looks up the value of the named parameter.
+/* A null pointer result means the parameter was not found.
+/* The result is volatile and should be copied if it is to be
+/* used for any appreciable amount of time.
+/*
+/* mail_conf_eval() recursively expands any $parameters in the
+/* string argument. The result is volatile and should be copied
+/* if it is to be used for any appreciable amount of time.
+/*
+/* mail_conf_eval_once() non-recursively expands any $parameters
+/* in the string argument. The result is volatile and should
+/* be copied if it is to be used for any appreciable amount
+/* of time.
+/*
+/* mail_conf_lookup_eval() looks up the named parameter, and expands any
+/* $parameters in the result. The result is volatile and should be
+/* copied if it is to be used for any appreciable amount of time.
+/* DIAGNOSTICS
+/* Fatal errors: malformed numerical value.
+/* ENVIRONMENT
+/* MAIL_CONFIG, non-default configuration database
+/* MAIL_VERBOSE, enable verbose mode
+/* FILES
+/* /etc/postfix: default Postfix configuration directory.
+/* SEE ALSO
+/* dict(3) generic dictionary manager
+/* mail_conf_int(3) integer-valued parameters
+/* mail_conf_str(3) string-valued parameters
+/* 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
+/*
+/* Wietse Venema
+/* Google, Inc.
+/* 111 8th Avenue
+/* New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <vstream.h>
+#include <vstring.h>
+#include <dict.h>
+#include <safe.h>
+#include <stringops.h>
+#include <readlline.h>
+
+/* Global library. */
+
+#include "mail_params.h"
+#include "mail_conf.h"
+
+/* mail_conf_checkdir - authorize non-default directory */
+
+void mail_conf_checkdir(const char *config_dir)
+{
+ VSTRING *buf;
+ VSTREAM *fp;
+ char *path;
+ char *name;
+ char *value;
+ char *cp;
+ int found = 0;
+
+ /*
+ * If running set-[ug]id, require that a non-default configuration
+ * directory name is blessed as a bona fide configuration directory in
+ * the default main.cf file.
+ */
+ path = concatenate(DEF_CONFIG_DIR, "/", "main.cf", (char *) 0);
+ if ((fp = vstream_fopen(path, O_RDONLY, 0)) == 0)
+ msg_fatal("open file %s: %m", path);
+
+ buf = vstring_alloc(1);
+ while (found == 0 && readlline(buf, fp, (int *) 0)) {
+ if (split_nameval(vstring_str(buf), &name, &value) == 0
+ && (strcmp(name, VAR_CONFIG_DIRS) == 0
+ || strcmp(name, VAR_MULTI_CONF_DIRS) == 0)) {
+ while (found == 0 && (cp = mystrtok(&value, CHARS_COMMA_SP)) != 0)
+ if (strcmp(cp, config_dir) == 0)
+ found = 1;
+ }
+ }
+ if (vstream_fclose(fp))
+ msg_fatal("read file %s: %m", path);
+ vstring_free(buf);
+
+ if (found == 0) {
+ msg_error("unauthorized configuration directory name: %s", config_dir);
+ msg_fatal("specify \"%s = %s\" or \"%s = %s\" in %s",
+ VAR_CONFIG_DIRS, config_dir,
+ VAR_MULTI_CONF_DIRS, config_dir, path);
+ }
+ myfree(path);
+}
+
+/* mail_conf_read - read global configuration file */
+
+void mail_conf_read(void)
+{
+ mail_conf_suck();
+ mail_params_init();
+}
+
+/* mail_conf_suck - suck in the global configuration file */
+
+void mail_conf_suck(void)
+{
+ char *config_dir;
+ char *path;
+
+ /*
+ * The code below requires that all configuration directory override
+ * mechanisms set the CONF_ENV_PATH environment variable, even if the
+ * override was specified via the command line. This reduces the number
+ * of pathways that need to be checked for possible security attacks.
+ *
+ * Note: this code necessarily runs before cleanenv() can enforce the
+ * import_environment scrubbing policy.
+ */
+
+ /*
+ * Permit references to unknown configuration variable names. We rely on
+ * a separate configuration checking tool to spot misspelled names and
+ * other kinds of trouble. Enter the configuration directory into the
+ * default dictionary.
+ */
+ if (var_config_dir)
+ myfree(var_config_dir);
+ if ((config_dir = getenv(CONF_ENV_PATH)) == 0)
+ config_dir = DEF_CONFIG_DIR;
+ var_config_dir = mystrdup(config_dir);
+ set_mail_conf_str(VAR_CONFIG_DIR, var_config_dir);
+
+ /*
+ * If the configuration directory name comes from an untrusted source,
+ * require that it is listed in the default main.cf file.
+ */
+ if (strcmp(var_config_dir, DEF_CONFIG_DIR) != 0 /* non-default */
+ && unsafe()) /* untrusted env and cli */
+ mail_conf_checkdir(var_config_dir);
+ path = concatenate(var_config_dir, "/", "main.cf", (char *) 0);
+ if (dict_load_file_xt(CONFIG_DICT, path) == 0)
+ msg_fatal("open %s: %m", path);
+ myfree(path);
+}
+
+/* mail_conf_flush - discard configuration dictionary */
+
+void mail_conf_flush(void)
+{
+ if (dict_handle(CONFIG_DICT) != 0)
+ dict_unregister(CONFIG_DICT);
+}
+
+/* mail_conf_eval - expand macros in string */
+
+const char *mail_conf_eval(const char *string)
+{
+#define RECURSIVE 1
+
+ return (dict_eval(CONFIG_DICT, string, RECURSIVE));
+}
+
+/* mail_conf_eval_once - expand one level of macros in string */
+
+const char *mail_conf_eval_once(const char *string)
+{
+#define NONRECURSIVE 0
+
+ return (dict_eval(CONFIG_DICT, string, NONRECURSIVE));
+}
+
+/* mail_conf_lookup - lookup named variable */
+
+const char *mail_conf_lookup(const char *name)
+{
+ return (dict_lookup(CONFIG_DICT, name));
+}
+
+/* mail_conf_lookup_eval - expand named variable */
+
+const char *mail_conf_lookup_eval(const char *name)
+{
+ const char *value;
+
+#define RECURSIVE 1
+
+ if ((value = dict_lookup(CONFIG_DICT, name)) != 0)
+ value = dict_eval(CONFIG_DICT, value, RECURSIVE);
+ return (value);
+}
+
+/* mail_conf_update - update parameter */
+
+void mail_conf_update(const char *key, const char *value)
+{
+ dict_update(CONFIG_DICT, key, value);
+}