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https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-11-24 17:44:17 +01:00
bb5359e97e
eliminates the "X-authentication-warning" header line that has been coming out since I made it so that sendmail is run totally as the user whose calendar file is currently being processed.
356 lines
9.1 KiB
C
356 lines
9.1 KiB
C
/*
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* Copyright (c) 1989, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1989, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static const char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94";
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#endif /* not lint */
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#include <sys/param.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <err.h>
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#include <errno.h>
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#include <locale.h>
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#include <string.h>
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#include <sys/uio.h>
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#include <sys/time.h>
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#include <stdlib.h>
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#include <pwd.h>
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#include <sys/wait.h>
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#include "pathnames.h"
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#include "calendar.h"
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char *calendarFile = "calendar"; /* default calendar file */
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char *calendarHome = ".calendar"; /* HOME */
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char *calendarNoMail = "nomail"; /* don't sent mail if this file exist */
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struct fixs neaster, npaskha;
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struct iovec header[] = {
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{"From: ", 6},
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{NULL, 0},
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{" (Reminder Service)\nTo: ", 24},
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{NULL, 0},
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{"\nSubject: ", 10},
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{NULL, 0},
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{"'s Calendar\nPrecedence: bulk\n\n", 30},
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};
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void
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cal()
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{
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register int printing;
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register char *p;
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FILE *fp;
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int ch, l;
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int month;
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int day;
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int var;
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char buf[2048 + 1];
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if ((fp = opencal()) == NULL)
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return;
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for (printing = 0; fgets(buf, sizeof(buf), stdin) != NULL;) {
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if ((p = strchr(buf, '\n')) != NULL)
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*p = '\0';
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else
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while ((ch = getchar()) != '\n' && ch != EOF);
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for (l = strlen(buf);
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l > 0 && isspace((unsigned char)buf[l - 1]);
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l--)
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;
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buf[l] = '\0';
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if (buf[0] == '\0')
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continue;
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if (strncmp(buf, "LANG=", 5) == 0) {
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(void) setlocale(LC_ALL, buf + 5);
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setnnames();
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continue;
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}
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if (strncasecmp(buf, "Easter=", 7) == 0 && buf[7]) {
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if (neaster.name != NULL)
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free(neaster.name);
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neaster.name = strdup(buf + 7);
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neaster.len = strlen(buf + 7);
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continue;
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}
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if (strncasecmp(buf, "Paskha=", 7) == 0 && buf[7]) {
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if (npaskha.name != NULL)
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free(npaskha.name);
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npaskha.name = strdup(buf + 7);
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npaskha.len = strlen(buf + 7);
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continue;
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}
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if (buf[0] != '\t') {
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printing = isnow(buf, &month, &day, &var) ? 1 : 0;
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if ((p = strchr(buf, '\t')) == NULL)
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continue;
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if (p > buf && p[-1] == '*')
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var = 1;
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if (printing) {
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struct tm tm;
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char dbuf[30];
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tm.tm_sec = 0; /* unused */
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tm.tm_min = 0; /* unused */
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tm.tm_hour = 0; /* unused */
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tm.tm_wday = 0; /* unused */
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tm.tm_mon = month - 1;
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tm.tm_mday = day;
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tm.tm_year = tp->tm_year; /* unused */
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(void)strftime(dbuf, sizeof(dbuf), "%c", &tm);
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dbuf[10] = '\0';
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(void)fprintf(fp, "%s%c%s\n",
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dbuf + 4/* skip weekdays */,
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var ? '*' : ' ', p);
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}
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}
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else if (printing)
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fprintf(fp, "%s\n", buf);
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}
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closecal(fp);
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}
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int
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getfield(p, endp, flags)
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char *p, **endp;
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int *flags;
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{
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int val, var;
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char *start, savech;
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for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p);
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if (*p == '*') { /* `*' is current month */
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*flags |= F_ISMONTH;
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*endp = p+1;
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return (tp->tm_mon + 1);
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}
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if (isdigit((unsigned char)*p)) {
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val = strtol(p, &p, 10); /* if 0, it's failure */
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for (; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p);
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*endp = p;
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return (val);
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}
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for (start = p; isalpha((unsigned char)*++p););
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/* Sunday-1 */
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if (*p == '+' || *p == '-')
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for(; isdigit((unsigned char)*++p););
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savech = *p;
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*p = '\0';
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/* Month */
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if ((val = getmonth(start)) != 0)
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*flags |= F_ISMONTH;
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/* Day */
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else if ((val = getday(start)) != 0) {
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*flags |= F_ISDAY;
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/* variable weekday */
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if ((var = getdayvar(start)) != 0) {
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if (var <=5 && var >= -4)
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val += var * 10;
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#ifdef DEBUG
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printf("var: %d\n", var);
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#endif
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}
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}
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/* Easter */
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else if ((val = geteaster(start, tp->tm_year + 1900)) != 0)
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*flags |= F_EASTER;
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/* Paskha */
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else if ((val = getpaskha(start, tp->tm_year + 1900)) != 0)
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*flags |= F_EASTER;
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/* undefined rest */
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else {
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*p = savech;
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return (0);
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}
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for (*p = savech; !isdigit((unsigned char)*p) && !isalpha((unsigned char)*p) && *p != '*'; ++p);
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*endp = p;
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return (val);
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}
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char path[MAXPATHLEN + 1];
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FILE *
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opencal()
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{
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uid_t uid;
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int fd, pdes[2];
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struct stat sbuf;
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/* open up calendar file as stdin */
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if (!freopen(calendarFile, "r", stdin)) {
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if (doall) {
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if (chdir(calendarHome) != 0)
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return (NULL);
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if (stat(calendarNoMail, &sbuf) == 0)
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return (NULL);
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if (!freopen(calendarFile, "r", stdin))
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return (NULL);
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} else {
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chdir(getenv("HOME"));
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if (!(chdir(calendarHome) == 0 &&
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freopen(calendarFile, "r", stdin)))
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errx(1, "no calendar file: ``%s'' or ``~/%s/%s\n", calendarFile, calendarHome, calendarFile);
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}
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}
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if (pipe(pdes) < 0)
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return (NULL);
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switch (vfork()) {
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case -1: /* error */
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(void)close(pdes[0]);
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(void)close(pdes[1]);
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return (NULL);
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case 0:
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/* child -- stdin already setup, set stdout to pipe input */
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if (pdes[1] != STDOUT_FILENO) {
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(void)dup2(pdes[1], STDOUT_FILENO);
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(void)close(pdes[1]);
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}
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(void)close(pdes[0]);
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uid = geteuid();
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if (setuid(getuid()) < 0) {
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fprintf(stderr, "calendar: first setuid failed\n");
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_exit(1);
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};
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if (setgid(getegid()) < 0) {
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fprintf(stderr, "calendar: setgid failed\n");
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_exit(1);
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}
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if (setuid(uid) < 0) {
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fprintf(stderr, "calendar: setuid failed\n");
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_exit(1);
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}
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execl(_PATH_CPP, "cpp", "-P", "-I.", _PATH_INCLUDE, NULL);
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(void)fprintf(stderr,
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"calendar: execl: %s: %s.\n", _PATH_CPP, strerror(errno));
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_exit(1);
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}
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/* parent -- set stdin to pipe output */
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(void)dup2(pdes[0], STDIN_FILENO);
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(void)close(pdes[0]);
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(void)close(pdes[1]);
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/* not reading all calendar files, just set output to stdout */
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if (!doall)
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return (stdout);
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/* set output to a temporary file, so if no output don't send mail */
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(void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
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if ((fd = mkstemp(path)) < 0)
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return (NULL);
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return (fdopen(fd, "w+"));
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}
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void
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closecal(fp)
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FILE *fp;
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{
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uid_t uid;
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struct stat sbuf;
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int nread, pdes[2], status;
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char buf[1024];
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if (!doall)
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return;
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(void)rewind(fp);
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if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
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goto done;
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if (pipe(pdes) < 0)
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goto done;
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switch (vfork()) {
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case -1: /* error */
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(void)close(pdes[0]);
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(void)close(pdes[1]);
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goto done;
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case 0:
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/* child -- set stdin to pipe output */
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if (pdes[0] != STDIN_FILENO) {
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(void)dup2(pdes[0], STDIN_FILENO);
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(void)close(pdes[0]);
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}
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(void)close(pdes[1]);
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uid = geteuid();
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if (setuid(getuid()) < 0) {
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fprintf(stderr, "calendar: setuid failed\n");
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_exit(1);
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};
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if (setgid(getegid()) < 0) {
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fprintf(stderr, "calendar: setgid failed\n");
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_exit(1);
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}
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if (setuid(uid) < 0) {
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fprintf(stderr, "calendar: setuid failed\n");
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_exit(1);
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}
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execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
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"\"Reminder Service\"", NULL);
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(void)fprintf(stderr,
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"calendar: %s: %s.\n", _PATH_SENDMAIL, strerror(errno));
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_exit(1);
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}
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/* parent -- write to pipe input */
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(void)close(pdes[0]);
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header[1].iov_base = header[3].iov_base = pw->pw_name;
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header[1].iov_len = header[3].iov_len = strlen(pw->pw_name);
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writev(pdes[1], header, 7);
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while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
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(void)write(pdes[1], buf, nread);
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(void)close(pdes[1]);
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done: (void)fclose(fp);
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(void)unlink(path);
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while (wait(&status) >= 0);
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}
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