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-rw-r--r--contrib/tcp_wrappers/options.c621
1 files changed, 0 insertions, 621 deletions
diff --git a/contrib/tcp_wrappers/options.c b/contrib/tcp_wrappers/options.c
deleted file mode 100644
index 4fc6c9468732..000000000000
--- a/contrib/tcp_wrappers/options.c
+++ /dev/null
@@ -1,621 +0,0 @@
- /*
- * General skeleton for adding options to the access control language. The
- * features offered by this module are documented in the hosts_options(5)
- * manual page (source file: hosts_options.5, "nroff -man" format).
- *
- * Notes and warnings for those who want to add features:
- *
- * In case of errors, abort options processing and deny access. There are too
- * many irreversible side effects to make error recovery feasible. For
- * example, it makes no sense to continue after we have already changed the
- * userid.
- *
- * In case of errors, do not terminate the process: the routines might be
- * called from a long-running daemon that should run forever. Instead, call
- * tcpd_jump() which does a non-local goto back into the hosts_access()
- * routine.
- *
- * In case of severe errors, use clean_exit() instead of directly calling
- * exit(), or the inetd may loop on an UDP request.
- *
- * In verification mode (for example, with the "tcpdmatch" command) the
- * "dry_run" flag is set. In this mode, an option function should just "say"
- * what it is going to do instead of really doing it.
- *
- * Some option functions do not return (for example, the twist option passes
- * control to another program). In verification mode (dry_run flag is set)
- * such options should clear the "dry_run" flag to inform the caller of this
- * course of action.
- */
-
-#ifndef lint
-static char sccsid[] = "@(#) options.c 1.17 96/02/11 17:01:31";
-#endif
-
-/* System libraries. */
-
-#include <sys/types.h>
-#include <sys/param.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <netinet/in.h>
-#include <netdb.h>
-#include <stdio.h>
-#include <syslog.h>
-#include <pwd.h>
-#include <grp.h>
-#include <ctype.h>
-#include <setjmp.h>
-#include <string.h>
-
-#ifndef MAXPATHNAMELEN
-#define MAXPATHNAMELEN BUFSIZ
-#endif
-
-/* Local stuff. */
-
-#include "tcpd.h"
-
-/* Options runtime support. */
-
-int dry_run = 0; /* flag set in verification mode */
-extern jmp_buf tcpd_buf; /* tcpd_jump() support */
-
-/* Options parser support. */
-
-static char whitespace_eq[] = "= \t\r\n";
-#define whitespace (whitespace_eq + 1)
-
-static char *get_field(); /* chew :-delimited field off string */
-static char *chop_string(); /* strip leading and trailing blanks */
-
-/* List of functions that implement the options. Add yours here. */
-
-static void user_option(); /* execute "user name.group" option */
-static void group_option(); /* execute "group name" option */
-static void umask_option(); /* execute "umask mask" option */
-static void linger_option(); /* execute "linger time" option */
-static void keepalive_option(); /* execute "keepalive" option */
-static void spawn_option(); /* execute "spawn command" option */
-static void twist_option(); /* execute "twist command" option */
-static void rfc931_option(); /* execute "rfc931" option */
-static void setenv_option(); /* execute "setenv name value" */
-static void nice_option(); /* execute "nice" option */
-static void severity_option(); /* execute "severity value" */
-static void allow_option(); /* execute "allow" option */
-static void deny_option(); /* execute "deny" option */
-static void banners_option(); /* execute "banners path" option */
-
-/* Structure of the options table. */
-
-struct option {
- char *name; /* keyword name, case is ignored */
- void (*func) (); /* function that does the real work */
- int flags; /* see below... */
-};
-
-#define NEED_ARG (1<<1) /* option requires argument */
-#define USE_LAST (1<<2) /* option must be last */
-#define OPT_ARG (1<<3) /* option has optional argument */
-#define EXPAND_ARG (1<<4) /* do %x expansion on argument */
-
-#define need_arg(o) ((o)->flags & NEED_ARG)
-#define opt_arg(o) ((o)->flags & OPT_ARG)
-#define permit_arg(o) ((o)->flags & (NEED_ARG | OPT_ARG))
-#define use_last(o) ((o)->flags & USE_LAST)
-#define expand_arg(o) ((o)->flags & EXPAND_ARG)
-
-/* List of known keywords. Add yours here. */
-
-static struct option option_table[] = {
- "user", user_option, NEED_ARG,
- "group", group_option, NEED_ARG,
- "umask", umask_option, NEED_ARG,
- "linger", linger_option, NEED_ARG,
- "keepalive", keepalive_option, 0,
- "spawn", spawn_option, NEED_ARG | EXPAND_ARG,
- "twist", twist_option, NEED_ARG | EXPAND_ARG | USE_LAST,
- "rfc931", rfc931_option, OPT_ARG,
- "setenv", setenv_option, NEED_ARG | EXPAND_ARG,
- "nice", nice_option, OPT_ARG,
- "severity", severity_option, NEED_ARG,
- "allow", allow_option, USE_LAST,
- "deny", deny_option, USE_LAST,
- "banners", banners_option, NEED_ARG,
- 0,
-};
-
-/* process_options - process access control options */
-
-void process_options(options, request)
-char *options;
-struct request_info *request;
-{
- char *key;
- char *value;
- char *curr_opt;
- char *next_opt;
- struct option *op;
- char bf[BUFSIZ];
-
- for (curr_opt = get_field(options); curr_opt; curr_opt = next_opt) {
- next_opt = get_field((char *) 0);
-
- /*
- * Separate the option into name and value parts. For backwards
- * compatibility we ignore exactly one '=' between name and value.
- */
- curr_opt = chop_string(curr_opt);
- if (*(value = curr_opt + strcspn(curr_opt, whitespace_eq))) {
- if (*value != '=') {
- *value++ = 0;
- value += strspn(value, whitespace);
- }
- if (*value == '=') {
- *value++ = 0;
- value += strspn(value, whitespace);
- }
- }
- if (*value == 0)
- value = 0;
- key = curr_opt;
-
- /*
- * Disallow missing option names (and empty option fields).
- */
- if (*key == 0)
- tcpd_jump("missing option name");
-
- /*
- * Lookup the option-specific info and do some common error checks.
- * Delegate option-specific processing to the specific functions.
- */
-
- for (op = option_table; op->name && STR_NE(op->name, key); op++)
- /* VOID */ ;
- if (op->name == 0)
- tcpd_jump("bad option name: \"%s\"", key);
- if (!value && need_arg(op))
- tcpd_jump("option \"%s\" requires value", key);
- if (value && !permit_arg(op))
- tcpd_jump("option \"%s\" requires no value", key);
- if (next_opt && use_last(op))
- tcpd_jump("option \"%s\" must be at end", key);
- if (value && expand_arg(op))
- value = chop_string(percent_x(bf, sizeof(bf), value, request));
- if (hosts_access_verbose)
- syslog(LOG_DEBUG, "option: %s %s", key, value ? value : "");
- (*(op->func)) (value, request);
- }
-}
-
-/* allow_option - grant access */
-
-/* ARGSUSED */
-
-static void allow_option(value, request)
-char *value;
-struct request_info *request;
-{
- longjmp(tcpd_buf, AC_PERMIT);
-}
-
-/* deny_option - deny access */
-
-/* ARGSUSED */
-
-static void deny_option(value, request)
-char *value;
-struct request_info *request;
-{
- longjmp(tcpd_buf, AC_DENY);
-}
-
-/* banners_option - expand %<char>, terminate each line with CRLF */
-
-static void banners_option(value, request)
-char *value;
-struct request_info *request;
-{
- char path[MAXPATHNAMELEN];
- char ibuf[BUFSIZ];
- char obuf[2 * BUFSIZ];
- struct stat st;
- int ch;
- FILE *fp;
-
- sprintf(path, "%s/%s", value, eval_daemon(request));
- if ((fp = fopen(path, "r")) != 0) {
- while ((ch = fgetc(fp)) == 0)
- write(request->fd, "", 1);
- ungetc(ch, fp);
- while (fgets(ibuf, sizeof(ibuf) - 1, fp)) {
- if (split_at(ibuf, '\n'))
- strcat(ibuf, "\r\n");
- percent_x(obuf, sizeof(obuf), ibuf, request);
- write(request->fd, obuf, strlen(obuf));
- }
- fclose(fp);
- } else if (stat(value, &st) < 0) {
- tcpd_warn("%s: %m", value);
- }
-}
-
-/* group_option - switch group id */
-
-/* ARGSUSED */
-
-static void group_option(value, request)
-char *value;
-struct request_info *request;
-{
- struct group *grp;
- struct group *getgrnam();
-
- if ((grp = getgrnam(value)) == 0)
- tcpd_jump("unknown group: \"%s\"", value);
- endgrent();
-
- if (dry_run == 0 && setgid(grp->gr_gid))
- tcpd_jump("setgid(%s): %m", value);
-}
-
-/* user_option - switch user id */
-
-/* ARGSUSED */
-
-static void user_option(value, request)
-char *value;
-struct request_info *request;
-{
- struct passwd *pwd;
- struct passwd *getpwnam();
- char *group;
-
- if ((group = split_at(value, '.')) != 0)
- group_option(group, request);
- if ((pwd = getpwnam(value)) == 0)
- tcpd_jump("unknown user: \"%s\"", value);
- endpwent();
-
- if (dry_run == 0 && setuid(pwd->pw_uid))
- tcpd_jump("setuid(%s): %m", value);
-}
-
-/* umask_option - set file creation mask */
-
-/* ARGSUSED */
-
-static void umask_option(value, request)
-char *value;
-struct request_info *request;
-{
- unsigned mask;
- char junk;
-
- if (sscanf(value, "%o%c", &mask, &junk) != 1 || (mask & 0777) != mask)
- tcpd_jump("bad umask value: \"%s\"", value);
- (void) umask(mask);
-}
-
-/* spawn_option - spawn a shell command and wait */
-
-/* ARGSUSED */
-
-static void spawn_option(value, request)
-char *value;
-struct request_info *request;
-{
- if (dry_run == 0)
- shell_cmd(value);
-}
-
-/* linger_option - set the socket linger time (Marc Boucher <marc@cam.org>) */
-
-/* ARGSUSED */
-
-static void linger_option(value, request)
-char *value;
-struct request_info *request;
-{
- struct linger linger;
- char junk;
-
- if (sscanf(value, "%d%c", &linger.l_linger, &junk) != 1
- || linger.l_linger < 0)
- tcpd_jump("bad linger value: \"%s\"", value);
- if (dry_run == 0) {
- linger.l_onoff = (linger.l_linger != 0);
- if (setsockopt(request->fd, SOL_SOCKET, SO_LINGER, (char *) &linger,
- sizeof(linger)) < 0)
- tcpd_warn("setsockopt SO_LINGER %d: %m", linger.l_linger);
- }
-}
-
-/* keepalive_option - set the socket keepalive option */
-
-/* ARGSUSED */
-
-static void keepalive_option(value, request)
-char *value;
-struct request_info *request;
-{
- static int on = 1;
-
- if (dry_run == 0 && setsockopt(request->fd, SOL_SOCKET, SO_KEEPALIVE,
- (char *) &on, sizeof(on)) < 0)
- tcpd_warn("setsockopt SO_KEEPALIVE: %m");
-}
-
-/* nice_option - set nice value */
-
-/* ARGSUSED */
-
-static void nice_option(value, request)
-char *value;
-struct request_info *request;
-{
- int niceval = 10;
- char junk;
-
- if (value != 0 && sscanf(value, "%d%c", &niceval, &junk) != 1)
- tcpd_jump("bad nice value: \"%s\"", value);
- if (dry_run == 0 && nice(niceval) < 0)
- tcpd_warn("nice(%d): %m", niceval);
-}
-
-/* twist_option - replace process by shell command */
-
-static void twist_option(value, request)
-char *value;
-struct request_info *request;
-{
- char *error;
-
- if (dry_run != 0) {
- dry_run = 0;
- } else {
- if (resident > 0)
- tcpd_jump("twist option in resident process");
-
- syslog(deny_severity, "twist %s to %s", eval_client(request), value);
-
- /* Before switching to the shell, set up stdin, stdout and stderr. */
-
-#define maybe_dup2(from, to) ((from == to) ? to : (close(to), dup(from)))
-
- if (maybe_dup2(request->fd, 0) != 0 ||
- maybe_dup2(request->fd, 1) != 1 ||
- maybe_dup2(request->fd, 2) != 2) {
- error = "twist_option: dup: %m";
- } else {
- if (request->fd > 2)
- close(request->fd);
- (void) execl("/bin/sh", "sh", "-c", value, (char *) 0);
- error = "twist_option: /bin/sh: %m";
- }
-
- /* Something went wrong: we MUST terminate the process. */
-
- tcpd_warn(error);
- clean_exit(request);
- }
-}
-
-/* rfc931_option - look up remote user name */
-
-static void rfc931_option(value, request)
-char *value;
-struct request_info *request;
-{
- int timeout;
- char junk;
-
- if (value != 0) {
- if (sscanf(value, "%d%c", &timeout, &junk) != 1 || timeout <= 0)
- tcpd_jump("bad rfc931 timeout: \"%s\"", value);
- rfc931_timeout = timeout;
- }
- (void) eval_user(request);
-}
-
-/* setenv_option - set environment variable */
-
-/* ARGSUSED */
-
-static void setenv_option(value, request)
-char *value;
-struct request_info *request;
-{
- char *var_value;
-
- if (*(var_value = value + strcspn(value, whitespace)))
- *var_value++ = 0;
- if (setenv(chop_string(value), chop_string(var_value), 1))
- tcpd_jump("memory allocation failure");
-}
-
- /*
- * The severity option goes last because it comes with a huge amount of ugly
- * #ifdefs and tables.
- */
-
-struct syslog_names {
- char *name;
- int value;
-};
-
-static struct syslog_names log_fac[] = {
-#ifdef LOG_KERN
- "kern", LOG_KERN,
-#endif
-#ifdef LOG_USER
- "user", LOG_USER,
-#endif
-#ifdef LOG_MAIL
- "mail", LOG_MAIL,
-#endif
-#ifdef LOG_DAEMON
- "daemon", LOG_DAEMON,
-#endif
-#ifdef LOG_AUTH
- "auth", LOG_AUTH,
-#endif
-#ifdef LOG_LPR
- "lpr", LOG_LPR,
-#endif
-#ifdef LOG_NEWS
- "news", LOG_NEWS,
-#endif
-#ifdef LOG_UUCP
- "uucp", LOG_UUCP,
-#endif
-#ifdef LOG_CRON
- "cron", LOG_CRON,
-#endif
-#ifdef LOG_LOCAL0
- "local0", LOG_LOCAL0,
-#endif
-#ifdef LOG_LOCAL1
- "local1", LOG_LOCAL1,
-#endif
-#ifdef LOG_LOCAL2
- "local2", LOG_LOCAL2,
-#endif
-#ifdef LOG_LOCAL3
- "local3", LOG_LOCAL3,
-#endif
-#ifdef LOG_LOCAL4
- "local4", LOG_LOCAL4,
-#endif
-#ifdef LOG_LOCAL5
- "local5", LOG_LOCAL5,
-#endif
-#ifdef LOG_LOCAL6
- "local6", LOG_LOCAL6,
-#endif
-#ifdef LOG_LOCAL7
- "local7", LOG_LOCAL7,
-#endif
- 0,
-};
-
-static struct syslog_names log_sev[] = {
-#ifdef LOG_EMERG
- "emerg", LOG_EMERG,
-#endif
-#ifdef LOG_ALERT
- "alert", LOG_ALERT,
-#endif
-#ifdef LOG_CRIT
- "crit", LOG_CRIT,
-#endif
-#ifdef LOG_ERR
- "err", LOG_ERR,
-#endif
-#ifdef LOG_WARNING
- "warning", LOG_WARNING,
-#endif
-#ifdef LOG_NOTICE
- "notice", LOG_NOTICE,
-#endif
-#ifdef LOG_INFO
- "info", LOG_INFO,
-#endif
-#ifdef LOG_DEBUG
- "debug", LOG_DEBUG,
-#endif
- 0,
-};
-
-/* severity_map - lookup facility or severity value */
-
-static int severity_map(table, name)
-struct syslog_names *table;
-char *name;
-{
- struct syslog_names *t;
-
- for (t = table; t->name; t++)
- if (STR_EQ(t->name, name))
- return (t->value);
- tcpd_jump("bad syslog facility or severity: \"%s\"", name);
- /* NOTREACHED */
-}
-
-/* severity_option - change logging severity for this event (Dave Mitchell) */
-
-/* ARGSUSED */
-
-static void severity_option(value, request)
-char *value;
-struct request_info *request;
-{
- char *level = split_at(value, '.');
-
- allow_severity = deny_severity = level ?
- severity_map(log_fac, value) | severity_map(log_sev, level) :
- severity_map(log_sev, value);
-}
-
-/* get_field - return pointer to next field in string */
-
-static char *get_field(string)
-char *string;
-{
- static char *last = "";
- char *src;
- char *dst;
- char *ret;
- int ch;
-
- /*
- * This function returns pointers to successive fields within a given
- * string. ":" is the field separator; warn if the rule ends in one. It
- * replaces a "\:" sequence by ":", without treating the result of
- * substitution as field terminator. A null argument means resume search
- * where the previous call terminated. This function destroys its
- * argument.
- *
- * Work from explicit source or from memory. While processing \: we
- * overwrite the input. This way we do not have to maintain buffers for
- * copies of input fields.
- */
-
- src = dst = ret = (string ? string : last);
- if (src[0] == 0)
- return (0);
-
- while (ch = *src) {
- if (ch == ':') {
- if (*++src == 0)
- tcpd_warn("rule ends in \":\"");
- break;
- }
- if (ch == '\\' && src[1] == ':')
- src++;
- *dst++ = *src++;
- }
- last = src;
- *dst = 0;
- return (ret);
-}
-
-/* chop_string - strip leading and trailing blanks from string */
-
-static char *chop_string(string)
-register char *string;
-{
- char *start = 0;
- char *end;
- char *cp;
-
- for (cp = string; *cp; cp++) {
- if (!isspace(*cp)) {
- if (start == 0)
- start = cp;
- end = cp;
- }
- }
- return (start ? (end[1] = 0, start) : cp);
-}
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