455 lines
9.7 KiB
C
455 lines
9.7 KiB
C
/*
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* SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
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* SPDX-FileCopyrightText: 1996 - 1997, Marek Michałkiewicz
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* SPDX-FileCopyrightText: 2005 , Tomasz Kłoczko
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* SPDX-FileCopyrightText: 2008 , Nicolas François
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <config.h>
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#ident "$Id$"
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#include <stdio.h>
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#include <ctype.h>
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#include <errno.h>
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#include "defines.h"
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#include "prototypes.h"
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#include "port.h"
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static FILE *ports;
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/*
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* portcmp - compare the name of a port to a /etc/porttime entry
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*
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* portcmp works like strcmp, except that if the last character
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* in a failing match is a '*', the match is considered to have
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* passed. The "*" match is suppressed whenever the port is "SU",
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* which is the token the "su" command uses to validate access.
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* A match returns 0, failure returns non-zero.
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*/
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static int portcmp (const char *pattern, const char *port)
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{
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const char *orig = port;
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while (('\0' != *pattern) && (*pattern == *port)) {
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pattern++;
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port++;
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}
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if (('\0' == *pattern) && ('\0' == *port)) {
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return 0;
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}
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if (('S' == orig[0]) && ('U' == orig[1]) && ('\0' == orig[2])) {
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return 1;
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}
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return (*pattern == '*') ? 0 : 1;
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}
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/*
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* setportent - open /etc/porttime file or rewind
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*
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* the /etc/porttime file is rewound if already open, or
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* opened for reading.
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*/
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static void setportent (void)
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{
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if (NULL != ports) {
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rewind (ports);
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} else {
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ports = fopen (PORTS, "r");
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}
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}
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/*
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* endportent - close the /etc/porttime file
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*
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* the /etc/porttime file is closed and the ports variable set
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* to NULL to indicate that the /etc/porttime file is no longer
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* open.
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*/
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static void endportent (void)
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{
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if (NULL != ports) {
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(void) fclose (ports);
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}
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ports = (FILE *) 0;
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}
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/*
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* getportent - read a single entry from /etc/porttime
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*
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* the next line in /etc/porttime is converted to a (struct port)
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* and a pointer to a static (struct port) is returned to the
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* invoker. NULL is returned on either EOF or error. errno is
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* set to EINVAL on error to distinguish the two conditions.
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*/
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static struct port *getportent (void)
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{
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static struct port port; /* static struct to point to */
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static char buf[BUFSIZ]; /* some space for stuff */
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static char *ttys[PORT_TTY + 1]; /* some pointers to tty names */
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static char *users[PORT_IDS + 1]; /* some pointers to user ids */
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static struct pt_time ptimes[PORT_TIMES + 1]; /* time ranges */
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char *cp; /* pointer into line */
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int dtime; /* scratch time of day */
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int i, j;
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int saveerr = errno; /* errno value on entry */
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/*
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* If the ports file is not open, open the file. Do not rewind
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* since we want to search from the beginning each time.
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*/
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if (NULL == ports) {
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setportent ();
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}
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if (NULL == ports) {
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errno = saveerr;
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return 0;
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}
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/*
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* Common point for beginning a new line -
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*
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* - read a line, and NUL terminate
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* - skip lines which begin with '#'
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* - parse off the tty names
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* - parse off a list of user names
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* - parse off a list of days and times
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*/
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again:
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/*
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* Get the next line and remove the last character, which
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* is a '\n'. Lines which begin with '#' are all ignored.
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*/
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if (fgets (buf, (int) sizeof buf, ports) == 0) {
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errno = saveerr;
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return 0;
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}
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if ('#' == buf[0]) {
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goto again;
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}
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/*
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* Get the name of the TTY device. It is the first colon
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* separated field, and is the name of the TTY with no
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* leading "/dev". The entry '*' is used to specify all
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* TTY devices.
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*/
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buf[strlen (buf) - 1] = 0;
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port.pt_names = ttys;
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for (cp = buf, j = 0; j < PORT_TTY; j++) {
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port.pt_names[j] = cp;
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while (('\0' != *cp) && (':' != *cp) && (',' != *cp)) {
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cp++;
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}
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if ('\0' == *cp) {
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goto again; /* line format error */
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}
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if (':' == *cp) { /* end of tty name list */
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break;
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}
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if (',' == *cp) { /* end of current tty name */
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*cp++ = '\0';
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}
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}
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*cp = '\0';
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cp++;
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port.pt_names[j + 1] = (char *) 0;
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/*
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* Get the list of user names. It is the second colon
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* separated field, and is a comma separated list of user
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* names. The entry '*' is used to specify all usernames.
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* The last entry in the list is a (char *) 0 pointer.
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*/
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if (':' != *cp) {
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port.pt_users = users;
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port.pt_users[0] = cp;
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for (j = 1; ':' != *cp; cp++) {
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if ((',' == *cp) && (j < PORT_IDS)) {
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*cp = '\0';
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cp++;
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port.pt_users[j] = cp;
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j++;
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}
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}
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port.pt_users[j] = 0;
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} else {
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port.pt_users = 0;
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}
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if (':' != *cp) {
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goto again;
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}
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*cp = '\0';
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cp++;
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/*
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* Get the list of valid times. The times field is the third
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* colon separated field and is a list of days of the week and
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* times during which this port may be used by this user. The
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* valid days are 'Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', and 'Sa'.
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*
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* In addition, the value 'Al' represents all 7 days, and 'Wk'
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* represents the 5 weekdays.
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*
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* Times are given as HHMM-HHMM. The ending time may be before
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* the starting time. Days are presumed to wrap at 0000.
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*/
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if ('\0' == *cp) {
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port.pt_times = 0;
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return &port;
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}
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port.pt_times = ptimes;
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/*
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* Get the next comma separated entry
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*/
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for (j = 0; ('\0' != *cp) && (j < PORT_TIMES); j++) {
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/*
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* Start off with no days of the week
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*/
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port.pt_times[j].t_days = 0;
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/*
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* Check each two letter sequence to see if it is
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* one of the abbreviations for the days of the
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* week or the other two values.
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*/
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for (i = 0;
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('\0' != cp[i]) && ('\0' != cp[i + 1]) && isalpha (cp[i]);
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i += 2) {
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switch ((cp[i] << 8) | (cp[i + 1])) {
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case ('S' << 8) | 'u':
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port.pt_times[j].t_days |= 01;
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break;
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case ('M' << 8) | 'o':
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port.pt_times[j].t_days |= 02;
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break;
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case ('T' << 8) | 'u':
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port.pt_times[j].t_days |= 04;
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break;
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case ('W' << 8) | 'e':
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port.pt_times[j].t_days |= 010;
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break;
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case ('T' << 8) | 'h':
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port.pt_times[j].t_days |= 020;
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break;
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case ('F' << 8) | 'r':
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port.pt_times[j].t_days |= 040;
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break;
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case ('S' << 8) | 'a':
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port.pt_times[j].t_days |= 0100;
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break;
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case ('W' << 8) | 'k':
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port.pt_times[j].t_days |= 076;
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break;
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case ('A' << 8) | 'l':
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port.pt_times[j].t_days |= 0177;
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break;
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default:
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errno = EINVAL;
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return 0;
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}
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}
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/*
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* The default is 'Al' if no days were seen.
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*/
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if (0 == i) {
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port.pt_times[j].t_days = 0177;
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}
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/*
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* The start and end times are separated from each
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* other by a '-'. The times are four digit numbers
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* representing the times of day.
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*/
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for (dtime = 0; ('\0' != cp[i]) && isdigit (cp[i]); i++) {
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dtime = dtime * 10 + cp[i] - '0';
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}
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if (('-' != cp[i]) || (dtime > 2400) || ((dtime % 100) > 59)) {
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goto again;
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}
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port.pt_times[j].t_start = dtime;
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cp = cp + i + 1;
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for (dtime = 0, i = 0;
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('\0' != cp[i]) && isdigit (cp[i]);
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i++) {
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dtime = dtime * 10 + cp[i] - '0';
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}
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if ( ((',' != cp[i]) && ('\0' != cp[i]))
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|| (dtime > 2400)
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|| ((dtime % 100) > 59)) {
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goto again;
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}
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port.pt_times[j].t_end = dtime;
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cp = cp + i + 1;
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}
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/*
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* The end of the list is indicated by a pair of -1's for the
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* start and end times.
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*/
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port.pt_times[j].t_start = port.pt_times[j].t_end = -1;
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return &port;
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}
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/*
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* getttyuser - get ports information for user and tty
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*
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* getttyuser() searches the ports file for an entry with a TTY
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* and user field both of which match the supplied TTY and
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* user name. The file is searched from the beginning, so the
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* entries are treated as an ordered list.
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*/
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static struct port *getttyuser (const char *tty, const char *user)
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{
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int i, j;
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struct port *port;
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setportent ();
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while ((port = getportent ()) != NULL) {
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if ( (0 == port->pt_names)
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|| (0 == port->pt_users)) {
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continue;
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}
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for (i = 0; NULL != port->pt_names[i]; i++) {
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if (portcmp (port->pt_names[i], tty) == 0) {
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break;
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}
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}
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if (port->pt_names[i] == 0) {
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continue;
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}
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for (j = 0; NULL != port->pt_users[j]; j++) {
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if ( (strcmp (user, port->pt_users[j]) == 0)
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|| (strcmp (port->pt_users[j], "*") == 0)) {
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break;
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}
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}
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if (port->pt_users[j] != 0) {
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break;
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}
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}
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endportent ();
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return port;
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}
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/*
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* isttytime - tell if a given user may login at a particular time
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*
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* isttytime searches the ports file for an entry which matches
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* the user name and TTY given.
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*/
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bool isttytime (const char *id, const char *port, time_t when)
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{
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int i;
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int dtime;
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struct port *pp;
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struct tm *tm;
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/*
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* Try to find a matching entry for this user. Default to
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* letting the user in - there are plenty of ways to have an
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* entry to match all users.
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*/
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pp = getttyuser (port, id);
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if (NULL == pp) {
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return true;
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}
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/*
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* The entry is there, but has no time entries - don't
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* ever let them login.
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*/
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if (0 == pp->pt_times) {
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return false;
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}
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/*
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* The current time is converted to HHMM format for
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* comparison against the time values in the TTY entry.
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*/
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tm = localtime (&when);
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dtime = tm->tm_hour * 100 + tm->tm_min;
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/*
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* Each time entry is compared against the current
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* time. For entries with the start after the end time,
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* the comparison is made so that the time is between
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* midnight and either the start or end time.
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*/
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for (i = 0; pp->pt_times[i].t_start != -1; i++) {
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if (!(pp->pt_times[i].t_days & PORT_DAY (tm->tm_wday))) {
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continue;
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}
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if (pp->pt_times[i].t_start <= pp->pt_times[i].t_end) {
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if ( (dtime >= pp->pt_times[i].t_start)
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&& (dtime <= pp->pt_times[i].t_end)) {
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return true;
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}
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} else {
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if ( (dtime >= pp->pt_times[i].t_start)
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|| (dtime <= pp->pt_times[i].t_end)) {
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return true;
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}
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}
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}
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/*
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* No matching time entry was found, user shouldn't
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* be let in right now.
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*/
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return false;
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}
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