Adding upstream version 3.4.23.upstream/3.4.23upstream

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

1 files changed, 278 insertions, 0 deletions

diff --git a/src/global/mail_conf.c b/src/global/mail_conf.c
new file mode 100644
index 0000000..cd79d35
--- /dev/null
+++ b/src/global/mail_conf.c
@@ -0,0 +1,278 @@
+/*++
+/* 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);
+}