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/*
* Copyright (c) 1994-1996, 1998-2010 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
#ifdef __TANDEM
# include <floss.h>
#endif
#include <config.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <pwd.h>
#include <grp.h>
#include <signal.h>
#include <time.h>
#include <errno.h>
#include <fcntl.h>
#include "sudo.h"
static void do_syslog __P((int, char *));
static void do_logfile __P((char *));
static void send_mail __P((const char *fmt, ...));
static int should_mail __P((int));
static void mysyslog __P((int, const char *, ...));
static char *new_logline __P((const char *, int));
#define MAXSYSLOGTRIES 16 /* num of retries for broken syslogs */
/*
* We do an openlog(3)/closelog(3) for each message because some
* authentication methods (notably PAM) use syslog(3) for their
* own nefarious purposes and may call openlog(3) and closelog(3).
* Note that because we don't want to assume that all systems have
* vsyslog(3) (HP-UX doesn't) "%m" will not be expanded.
* Sadly this is a maze of #ifdefs.
*/
static void
#ifdef __STDC__
mysyslog(int pri, const char *fmt, ...)
#else
mysyslog(pri, fmt, va_alist)
int pri;
const char *fmt;
va_dcl
#endif
{
#ifdef BROKEN_SYSLOG
int i;
#endif
char buf[MAXSYSLOGLEN+1];
va_list ap;
#ifdef __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
#ifdef LOG_NFACILITIES
openlog("sudo", 0, def_syslog);
#else
openlog("sudo", 0);
#endif
vsnprintf(buf, sizeof(buf), fmt, ap);
#ifdef BROKEN_SYSLOG
/*
* Some versions of syslog(3) don't guarantee success and return
* an int (notably HP-UX < 10.0). So, if at first we don't succeed,
* try, try again...
*/
for (i = 0; i < MAXSYSLOGTRIES; i++)
if (syslog(pri, "%s", buf) == 0)
break;
#else
syslog(pri, "%s", buf);
#endif /* BROKEN_SYSLOG */
va_end(ap);
closelog();
}
#define FMT_FIRST "%8s : %s"
#define FMT_CONTD "%8s : (command continued) %s"
/*
* Log a message to syslog, pre-pending the username and splitting the
* message into parts if it is longer than MAXSYSLOGLEN.
*/
static void
do_syslog(pri, msg)
int pri;
char *msg;
{
size_t len, maxlen;
char *p, *tmp, save;
const char *fmt;
/*
* Log the full line, breaking into multiple syslog(3) calls if necessary
*/
fmt = FMT_FIRST;
maxlen = MAXSYSLOGLEN - (sizeof(FMT_FIRST) - 6 + strlen(user_name));
for (p = msg; *p != '\0'; ) {
len = strlen(p);
if (len > maxlen) {
/*
* Break up the line into what will fit on one syslog(3) line
* Try to avoid breaking words into several lines if possible.
*/
tmp = memrchr(p, ' ', maxlen);
if (tmp == NULL)
tmp = p + maxlen;
/* NULL terminate line, but save the char to restore later */
save = *tmp;
*tmp = '\0';
mysyslog(pri, fmt, user_name, p);
*tmp = save; /* restore saved character */
/* Advance p and eliminate leading whitespace */
for (p = tmp; *p == ' '; p++)
;
} else {
mysyslog(pri, fmt, user_name, p);
p += len;
}
fmt = FMT_CONTD;
maxlen = MAXSYSLOGLEN - (sizeof(FMT_CONTD) - 6 + strlen(user_name));
}
}
static void
do_logfile(msg)
char *msg;
{
char *full_line;
char *beg, *oldend, *end;
FILE *fp;
mode_t oldmask;
size_t maxlen;
oldmask = umask(077);
maxlen = def_loglinelen > 0 ? def_loglinelen : 0;
fp = fopen(def_logfile, "a");
(void) umask(oldmask);
if (fp == NULL) {
send_mail("Can't open log file: %s: %s", def_logfile, strerror(errno));
} else if (!lock_file(fileno(fp), SUDO_LOCK)) {
send_mail("Can't lock log file: %s: %s", def_logfile, strerror(errno));
} else {
time_t now;
now = time(NULL);
if (def_loglinelen == 0) {
/* Don't pretty-print long log file lines (hard to grep) */
if (def_log_host)
(void) fprintf(fp, "%s : %s : HOST=%s : %s\n",
get_timestr(now, def_log_year), user_name, user_shost, msg);
else
(void) fprintf(fp, "%s : %s : %s\n",
get_timestr(now, def_log_year), user_name, msg);
} else {
if (def_log_host)
easprintf(&full_line, "%s : %s : HOST=%s : %s",
get_timestr(now, def_log_year), user_name, user_shost, msg);
else
easprintf(&full_line, "%s : %s : %s",
get_timestr(now, def_log_year), user_name, msg);
/*
* Print out full_line with word wrap
*/
beg = end = full_line;
while (beg) {
oldend = end;
end = strchr(oldend, ' ');
if (maxlen > 0 && end) {
*end = '\0';
if (strlen(beg) > maxlen) {
/* too far, need to back up & print the line */
if (beg == (char *)full_line)
maxlen -= 4; /* don't indent first line */
*end = ' ';
if (oldend != beg) {
/* rewind & print */
end = oldend-1;
while (*end == ' ')
--end;
*(++end) = '\0';
(void) fprintf(fp, "%s\n ", beg);
*end = ' ';
} else {
(void) fprintf(fp, "%s\n ", beg);
}
/* reset beg to point to the start of the new substr */
beg = end;
while (*beg == ' ')
++beg;
} else {
/* we still have room */
*end = ' ';
}
/* remove leading whitespace */
while (*end == ' ')
++end;
} else {
/* final line */
(void) fprintf(fp, "%s\n", beg);
beg = NULL; /* exit condition */
}
}
efree(full_line);
}
(void) fflush(fp);
(void) lock_file(fileno(fp), SUDO_UNLOCK);
(void) fclose(fp);
}
}
/*
* Log and mail the denial message, optionally informing the user.
*/
void
log_denial(status, inform_user)
int status;
int inform_user;
{
char *message;
char *logline;
/* Set error message. */
if (ISSET(status, FLAG_NO_USER))
message = "user NOT in sudoers";
else if (ISSET(status, FLAG_NO_HOST))
message = "user NOT authorized on host";
else
message = "command not allowed";
logline = new_logline(message, 0);
if (should_mail(status))
send_mail("%s", logline); /* send mail based on status */
/* Inform the user if they failed to authenticate. */
if (inform_user) {
if (ISSET(status, FLAG_NO_USER))
(void) fprintf(stderr, "%s is not in the sudoers file. %s",
user_name, "This incident will be reported.\n");
else if (ISSET(status, FLAG_NO_HOST))
(void) fprintf(stderr, "%s is not allowed to run sudo on %s. %s",
user_name, user_shost, "This incident will be reported.\n");
else if (ISSET(status, FLAG_NO_CHECK))
(void) fprintf(stderr, "Sorry, user %s may not run sudo on %s.\n",
user_name, user_shost);
else
(void) fprintf(stderr,
"Sorry, user %s is not allowed to execute '%s%s%s' as %s%s%s on %s.\n",
user_name, user_cmnd, user_args ? " " : "",
user_args ? user_args : "",
list_pw ? list_pw->pw_name : runas_pw ?
runas_pw->pw_name : user_name, runas_gr ? ":" : "",
runas_gr ? runas_gr->gr_name : "", user_host);
}
/*
* Log via syslog and/or a file.
*/
if (def_syslog)
do_syslog(def_syslog_badpri, logline);
if (def_logfile)
do_logfile(logline);
efree(logline);
}
/*
* Log and potentially mail the allowed command.
*/
void
log_allowed(status)
int status;
{
char *logline;
logline = new_logline(NULL, 0);
if (should_mail(status))
send_mail("%s", logline); /* send mail based on status */
/*
* Log via syslog and/or a file.
*/
if (def_syslog)
do_syslog(def_syslog_goodpri, logline);
if (def_logfile)
do_logfile(logline);
efree(logline);
}
void
#ifdef __STDC__
log_error(int flags, const char *fmt, ...)
#else
log_error(flags, fmt, va_alist)
int flags;
const char *fmt;
va_dcl
#endif
{
int serrno = errno;
char *message;
char *logline;
va_list ap;
#ifdef __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
/* Become root if we are not already to avoid user interference */
set_perms(PERM_ROOT|PERM_NOEXIT);
/* Expand printf-style format + args. */
evasprintf(&message, fmt, ap);
va_end(ap);
if (ISSET(flags, MSG_ONLY))
logline = message;
else
logline = new_logline(message, ISSET(flags, USE_ERRNO) ? serrno : 0);
/*
* Tell the user.
*/
if (!ISSET(flags, NO_STDERR)) {
if (ISSET(flags, USE_ERRNO))
warning("%s", message);
else
warningx("%s", message);
}
if (logline != message)
efree(message);
/*
* Send a copy of the error via mail.
*/
if (!ISSET(flags, NO_MAIL))
send_mail("%s", logline);
/*
* Log to syslog and/or a file.
*/
if (def_syslog)
do_syslog(def_syslog_badpri, logline);
if (def_logfile)
do_logfile(logline);
efree(logline);
if (!ISSET(flags, NO_EXIT)) {
cleanup(0);
exit(1);
}
}
#define MAX_MAILFLAGS 63
/*
* Send a message to MAILTO user
*/
static void
#ifdef __STDC__
send_mail(const char *fmt, ...)
#else
send_mail(fmt, va_alist)
const char *fmt;
va_dcl
#endif
{
FILE *mail;
char *p;
int fd, pfd[2], status;
pid_t pid, rv;
sigaction_t sa;
va_list ap;
#ifndef NO_ROOT_MAILER
static char *root_envp[] = {
"HOME=/",
"PATH=/usr/bin:/bin:/usr/sbin:/sbin",
"LOGNAME=root",
"USERNAME=root",
"USER=root",
NULL
};
#endif
/* Just return if mailer is disabled. */
if (!def_mailerpath || !def_mailto)
return;
/* Fork and return, child will daemonize. */
switch (pid = fork()) {
case -1:
/* Error. */
error(1, "cannot fork");
break;
case 0:
/* Child. */
switch (pid = fork()) {
case -1:
/* Error. */
mysyslog(LOG_ERR, "cannot fork: %m");
_exit(1);
case 0:
/* Grandchild continues below. */
break;
default:
/* Parent will wait for us. */
_exit(0);
}
break;
default:
/* Parent. */
do {
#ifdef HAVE_WAITPID
rv = waitpid(pid, &status, 0);
#else
rv = wait(&status);
#endif
} while (rv == -1 && errno == EINTR);
return;
}
/* Daemonize - disassociate from session/tty. */
if (setsid() == -1)
warning("setsid");
(void) chdir("/");
if ((fd = open(_PATH_DEVNULL, O_RDWR, 0644)) != -1) {
(void) dup2(fd, STDIN_FILENO);
(void) dup2(fd, STDOUT_FILENO);
(void) dup2(fd, STDERR_FILENO);
}
/* Close password, group and other fds so we don't leak. */
sudo_endpwent();
sudo_endgrent();
closefrom(STDERR_FILENO + 1);
/* Ignore SIGPIPE in case mailer exits prematurely (or is missing). */
zero_bytes(&sa, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_INTERRUPT;
sa.sa_handler = SIG_IGN;
(void) sigaction(SIGPIPE, &sa, NULL);
if (pipe(pfd) == -1) {
mysyslog(LOG_ERR, "cannot open pipe: %m");
_exit(1);
}
switch (pid = fork()) {
case -1:
/* Error. */
mysyslog(LOG_ERR, "cannot fork: %m");
_exit(1);
break;
case 0:
{
char *argv[MAX_MAILFLAGS + 1];
char *mpath, *mflags;
int i;
/* Child, set stdin to output side of the pipe */
if (pfd[0] != STDIN_FILENO) {
if (dup2(pfd[0], STDIN_FILENO) == -1) {
mysyslog(LOG_ERR, "cannot dup stdin: %m");
_exit(127);
}
(void) close(pfd[0]);
}
(void) close(pfd[1]);
/* Build up an argv based on the mailer path and flags */
mflags = estrdup(def_mailerflags);
mpath = estrdup(def_mailerpath);
if ((argv[0] = strrchr(mpath, ' ')))
argv[0]++;
else
argv[0] = mpath;
i = 1;
if ((p = strtok(mflags, " \t"))) {
do {
argv[i] = p;
} while (++i < MAX_MAILFLAGS && (p = strtok(NULL, " \t")));
}
argv[i] = NULL;
/*
* Depending on the config, either run the mailer as root
* (so user cannot kill it) or as the user (for the paranoid).
*/
#ifndef NO_ROOT_MAILER
set_perms(PERM_ROOT|PERM_NOEXIT);
execve(mpath, argv, root_envp);
#else
set_perms(PERM_FULL_USER|PERM_NOEXIT);
execv(mpath, argv);
#endif /* NO_ROOT_MAILER */
mysyslog(LOG_ERR, "cannot execute %s: %m", mpath);
_exit(127);
}
break;
}
(void) close(pfd[0]);
mail = fdopen(pfd[1], "w");
/* Pipes are all setup, send message. */
(void) fprintf(mail, "To: %s\nFrom: %s\nAuto-Submitted: %s\nSubject: ",
def_mailto, def_mailfrom ? def_mailfrom : user_name, "auto-generated");
for (p = def_mailsub; *p; p++) {
/* Expand escapes in the subject */
if (*p == '%' && *(p+1) != '%') {
switch (*(++p)) {
case 'h':
(void) fputs(user_host, mail);
break;
case 'u':
(void) fputs(user_name, mail);
break;
default:
p--;
break;
}
} else
(void) fputc(*p, mail);
}
(void) fprintf(mail, "\n\n%s : %s : %s : ", user_host,
get_timestr(time(NULL), def_log_year), user_name);
#ifdef __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
(void) vfprintf(mail, fmt, ap);
va_end(ap);
fputs("\n\n", mail);
fclose(mail);
do {
#ifdef HAVE_WAITPID
rv = waitpid(pid, &status, 0);
#else
rv = wait(&status);
#endif
} while (rv == -1 && errno == EINTR);
_exit(0);
}
/*
* Determine whether we should send mail based on "status" and defaults options.
*/
static int
should_mail(status)
int status;
{
return(def_mail_always || ISSET(status, VALIDATE_ERROR) ||
(def_mail_no_user && ISSET(status, FLAG_NO_USER)) ||
(def_mail_no_host && ISSET(status, FLAG_NO_HOST)) ||
(def_mail_no_perms && !ISSET(status, VALIDATE_OK)));
}
#define LL_TTY_STR "TTY="
#define LL_CWD_STR "PWD=" /* XXX - should be CWD= */
#define LL_USER_STR "USER="
#define LL_GROUP_STR "GROUP="
#define LL_ENV_STR "ENV="
#define LL_CMND_STR "COMMAND="
#define LL_TSID_STR "TSID="
/*
* Allocate and fill in a new logline.
*/
static char *
new_logline(message, serrno)
const char *message;
int serrno;
{
size_t len = 0;
char *evstr = NULL;
char *errstr = NULL;
char *line;
/*
* Compute line length
*/
if (message != NULL)
len += strlen(message) + 3;
if (serrno) {
errstr = strerror(serrno);
len += strlen(errstr) + 3;
}
len += sizeof(LL_TTY_STR) + 2 + strlen(user_tty);
len += sizeof(LL_CWD_STR) + 2 + strlen(user_cwd);
if (runas_pw != NULL)
len += sizeof(LL_USER_STR) + 2 + strlen(runas_pw->pw_name);
if (runas_gr != NULL)
len += sizeof(LL_GROUP_STR) + 2 + strlen(runas_gr->gr_name);
if (sudo_user.sessid[0] != '\0')
len += sizeof(LL_TSID_STR) + 2 + strlen(sudo_user.sessid);
if (sudo_user.env_vars != NULL) {
size_t evlen = 0;
struct list_member *cur;
for (cur = sudo_user.env_vars; cur != NULL; cur = cur->next)
evlen += strlen(cur->value) + 1;
evstr = emalloc(evlen);
evstr[0] = '\0';
for (cur = sudo_user.env_vars; cur != NULL; cur = cur->next) {
strlcat(evstr, cur->value, evlen);
strlcat(evstr, " ", evlen); /* NOTE: last one will fail */
}
len += sizeof(LL_ENV_STR) + 2 + evlen;
}
len += sizeof(LL_CMND_STR) - 1 + strlen(user_cmnd);
if (user_args != NULL)
len += strlen(user_args) + 1;
/*
* Allocate and build up the line.
*/
line = emalloc(++len);
line[0] = '\0';
if (message != NULL) {
if (strlcat(line, message, len) >= len ||
strlcat(line, errstr ? " : " : " ; ", len) >= len)
goto toobig;
}
if (serrno) {
if (strlcat(line, errstr, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
}
if (strlcat(line, LL_TTY_STR, len) >= len ||
strlcat(line, user_tty, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
if (strlcat(line, LL_CWD_STR, len) >= len ||
strlcat(line, user_cwd, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
if (runas_pw != NULL) {
if (strlcat(line, LL_USER_STR, len) >= len ||
strlcat(line, runas_pw->pw_name, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
}
if (runas_gr != NULL) {
if (strlcat(line, LL_GROUP_STR, len) >= len ||
strlcat(line, runas_gr->gr_name, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
}
if (sudo_user.sessid[0] != '\0') {
if (strlcat(line, LL_TSID_STR, len) >= len ||
strlcat(line, sudo_user.sessid, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
}
if (evstr != NULL) {
if (strlcat(line, LL_ENV_STR, len) >= len ||
strlcat(line, evstr, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
efree(evstr);
}
if (strlcat(line, LL_CMND_STR, len) >= len ||
strlcat(line, user_cmnd, len) >= len)
goto toobig;
if (user_args != NULL) {
if (strlcat(line, " ", len) >= len ||
strlcat(line, user_args, len) >= len)
goto toobig;
}
return (line);
toobig:
errorx(1, "internal error: insufficient space for log line");
}
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