/*
* Copyright (c) 1994-1996, 1998-2011 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 */
#ifdef HAVE_SETLOCALE
# include <locale.h>
#endif /* HAVE_SETLOCALE */
#ifdef HAVE_NL_LANGINFO
# include <langinfo.h>
#endif /* HAVE_NL_LANGINFO */
#include <pwd.h>
#include <grp.h>
#include <signal.h>
#include <time.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <setjmp.h>
#include "sudoers.h"
static void do_syslog(int, char *);
static void do_logfile(char *);
static void send_mail(const char *fmt, ...);
static int should_mail(int);
static void mysyslog(int, const char *, ...);
static char *new_logline(const char *, int);
extern sigjmp_buf error_jmp;
#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
mysyslog(int pri, const char *fmt, ...)
{
#ifdef BROKEN_SYSLOG
int i;
#endif
char buf[MAXSYSLOGLEN+1];
va_list ap;
debug_decl(mysyslog, SUDO_DEBUG_LOGGING)
va_start(ap, fmt);
#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();
debug_return;
}
#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(int pri, char *msg)
{
size_t len, maxlen;
char *p, *tmp, save;
const char *fmt;
debug_decl(do_syslog, SUDO_DEBUG_LOGGING)
#ifdef HAVE_SETLOCALE
const char *old_locale = estrdup(setlocale(LC_ALL, NULL));
if (!setlocale(LC_ALL, def_sudoers_locale))
setlocale(LC_ALL, "C");
#endif /* HAVE_SETLOCALE */
/*
* Log the full line, breaking into multiple syslog(3) calls if necessary
*/
fmt = _(FMT_FIRST);
maxlen = MAXSYSLOGLEN - (strlen(fmt) - 5 + 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 - (strlen(fmt) - 5 + strlen(user_name));
}
#ifdef HAVE_SETLOCALE
setlocale(LC_ALL, old_locale);
efree((void *)old_locale);
#endif /* HAVE_SETLOCALE */
debug_return;
}
static void
do_logfile(char *msg)
{
char *full_line;
size_t len;
mode_t oldmask;
time_t now;
FILE *fp;
debug_decl(do_logfile, SUDO_DEBUG_LOGGING)
oldmask = umask(077);
fp = fopen(def_logfile, "a");
(void) umask(oldmask);
if (fp == NULL) {
send_mail(_("unable to open log file: %s: %s"),
def_logfile, strerror(errno));
} else if (!lock_file(fileno(fp), SUDO_LOCK)) {
send_mail(_("unable to lock log file: %s: %s"),
def_logfile, strerror(errno));
} else {
#ifdef HAVE_SETLOCALE
const char *old_locale = estrdup(setlocale(LC_ALL, NULL));
if (!setlocale(LC_ALL, def_sudoers_locale))
setlocale(LC_ALL, "C");
#endif /* HAVE_SETLOCALE */
now = time(NULL);
if (def_loglinelen < sizeof(LOG_INDENT)) {
/* 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)
len = easprintf(&full_line, "%s : %s : HOST=%s : %s",
get_timestr(now, def_log_year), user_name, user_shost, msg);
else
len = easprintf(&full_line, "%s : %s : %s",
get_timestr(now, def_log_year), user_name, msg);
/*
* Print out full_line with word wrap around def_loglinelen chars.
*/
writeln_wrap(fp, full_line, len, def_loglinelen);
efree(full_line);
}
(void) fflush(fp);
(void) lock_file(fileno(fp), SUDO_UNLOCK);
(void) fclose(fp);
#ifdef HAVE_SETLOCALE
setlocale(LC_ALL, old_locale);
efree((void *)old_locale);
#endif /* HAVE_SETLOCALE */
}
debug_return;
}
/*
* Log and mail the denial message, optionally informing the user.
*/
void
log_denial(int status, int inform_user)
{
char *logline, *message;
debug_decl(log_denial, SUDO_DEBUG_LOGGING)
/* 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)) {
sudo_printf(SUDO_CONV_ERROR_MSG, _("%s is not in the sudoers "
"file. This incident will be reported.\n"), user_name);
} else if (ISSET(status, FLAG_NO_HOST)) {
sudo_printf(SUDO_CONV_ERROR_MSG, _("%s is not allowed to run sudo "
"on %s. This incident will be reported.\n"),
user_name, user_shost);
} else if (ISSET(status, FLAG_NO_CHECK)) {
sudo_printf(SUDO_CONV_ERROR_MSG, _("Sorry, user %s may not run "
"sudo on %s.\n"), user_name, user_shost);
} else {
sudo_printf(SUDO_CONV_ERROR_MSG, _("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);
debug_return;
}
/*
* Log and potentially mail the allowed command.
*/
void
log_allowed(int status)
{
char *logline;
debug_decl(log_allowed, SUDO_DEBUG_LOGGING)
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);
debug_return;
}
/*
* Perform logging for log_error()/log_fatal()
*/
static void
vlog_error(int flags, const char *fmt, va_list ap)
{
int serrno = errno;
char *logline, *message;
debug_decl(vlog_error, SUDO_DEBUG_LOGGING)
/* Expand printf-style format + args. */
evasprintf(&message, fmt, ap);
/* Become root if we are not already to avoid user interference */
set_perms(PERM_ROOT|PERM_NOEXIT);
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);
restore_perms();
debug_return;
}
void
log_error(int flags, const char *fmt, ...)
{
va_list ap;
debug_decl(log_error, SUDO_DEBUG_LOGGING)
/* Log the error. */
va_start(ap, fmt);
vlog_error(flags, fmt, ap);
va_end(ap);
debug_return;
}
void
log_fatal(int flags, const char *fmt, ...)
{
va_list ap;
debug_decl(log_error, SUDO_DEBUG_LOGGING)
/* Log the error. */
va_start(ap, fmt);
vlog_error(flags, fmt, ap);
va_end(ap);
/* Exit the plugin. */
plugin_cleanup(0);
sudo_debug_exit(__func__, __FILE__, __LINE__, sudo_debug_subsys);
siglongjmp(error_jmp, 1);
}
#define MAX_MAILFLAGS 63
/*
* Send a message to MAILTO user
*/
static void
send_mail(const char *fmt, ...)
{
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 /* NO_ROOT_MAILER */
debug_decl(send_mail, SUDO_DEBUG_LOGGING)
/* Just return if mailer is disabled. */
if (!def_mailerpath || !def_mailto)
debug_return;
/* Fork and return, child will daemonize. */
switch (pid = sudo_debug_fork()) {
case -1:
/* Error. */
error(1, _("unable to fork"));
break;
case 0:
/* Child. */
switch (pid = fork()) {
case -1:
/* Error. */
mysyslog(LOG_ERR, _("unable to fork: %m"));
sudo_debug_printf(SUDO_DEBUG_ERROR, "unable to fork: %s",
strerror(errno));
_exit(1);
case 0:
/* Grandchild continues below. */
break;
default:
/* Parent will wait for us. */
_exit(0);
}
break;
default:
/* Parent. */
do {
rv = waitpid(pid, &status, 0);
} while (rv == -1 && errno == EINTR);
return; /* not debug */
}
/* Daemonize - disassociate from session/tty. */
if (setsid() == -1)
warning("setsid");
if (chdir("/") == -1)
warning("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);
}
#ifdef HAVE_SETLOCALE
if (!setlocale(LC_ALL, def_sudoers_locale)) {
setlocale(LC_ALL, "C");
efree(def_sudoers_locale);
def_sudoers_locale = estrdup("C");
}
#endif /* HAVE_SETLOCALE */
/* 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, _("unable to open pipe: %m"));
sudo_debug_printf(SUDO_DEBUG_ERROR, "unable to open pipe: %s",
strerror(errno));
sudo_debug_exit(__func__, __FILE__, __LINE__, sudo_debug_subsys);
_exit(1);
}
switch (pid = sudo_debug_fork()) {
case -1:
/* Error. */
mysyslog(LOG_ERR, _("unable to fork: %m"));
sudo_debug_printf(SUDO_DEBUG_ERROR, "unable to fork: %s",
strerror(errno));
sudo_debug_exit(__func__, __FILE__, __LINE__, sudo_debug_subsys);
_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, _("unable to dup stdin: %m"));
sudo_debug_printf(SUDO_DEBUG_ERROR,
"unable to dup stdin: %s", strerror(errno));
_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, _("unable to execute %s: %m"), mpath);
sudo_debug_printf(SUDO_DEBUG_ERROR, "unable to execute %s: %s",
mpath, strerror(errno));
_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);
}
#ifdef HAVE_NL_LANGINFO
if (strcmp(def_sudoers_locale, "C") != 0)
(void) fprintf(mail, "\nContent-Type: text/plain; charset=\"%s\"\nContent-Transfer-Encoding: 8bit", nl_langinfo(CODESET));
#endif /* HAVE_NL_LANGINFO */
(void) fprintf(mail, "\n\n%s : %s : %s : ", user_host,
get_timestr(time(NULL), def_log_year), user_name);
va_start(ap, fmt);
(void) vfprintf(mail, fmt, ap);
va_end(ap);
fputs("\n\n", mail);
fclose(mail);
do {
rv = waitpid(pid, &status, 0);
} while (rv == -1 && errno == EINTR);
sudo_debug_exit(__func__, __FILE__, __LINE__, sudo_debug_subsys);
_exit(0);
}
/*
* Determine whether we should send mail based on "status" and defaults options.
*/
static int
should_mail(int status)
{
debug_decl(should_mail, SUDO_DEBUG_LOGGING)
debug_return_bool(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="
#define IS_SESSID(s) ( \
isalnum((unsigned char)(s)[0]) && isalnum((unsigned char)(s)[1]) && \
(s)[2] == '/' && \
isalnum((unsigned char)(s)[3]) && isalnum((unsigned char)(s)[4]) && \
(s)[5] == '/' && \
isalnum((unsigned char)(s)[6]) && isalnum((unsigned char)(s)[7]) && \
(s)[8] == '\0')
/*
* Allocate and fill in a new logline.
*/
static char *
new_logline(const char *message, int serrno)
{
size_t len = 0;
char *errstr = NULL;
char *evstr = NULL;
char *line, sessid[7], *tsid = NULL;
debug_decl(new_logline, SUDO_DEBUG_LOGGING)
/* A TSID may be a sudoers-style session ID or a free-form string. */
if (sudo_user.iolog_file != NULL) {
if (IS_SESSID(sudo_user.iolog_file)) {
sessid[0] = sudo_user.iolog_file[0];
sessid[1] = sudo_user.iolog_file[1];
sessid[2] = sudo_user.iolog_file[3];
sessid[3] = sudo_user.iolog_file[4];
sessid[4] = sudo_user.iolog_file[6];
sessid[5] = sudo_user.iolog_file[7];
sessid[6] = '\0';
tsid = sessid;
} else {
tsid = sudo_user.iolog_file;
}
}
/*
* 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 (tsid != NULL)
len += sizeof(LL_TSID_STR) + 2 + strlen(tsid);
if (sudo_user.env_vars != NULL) {
size_t evlen = 0;
char * const *ep;
for (ep = sudo_user.env_vars; *ep != NULL; ep++)
evlen += strlen(*ep) + 1;
evstr = emalloc(evlen);
evstr[0] = '\0';
for (ep = sudo_user.env_vars; *ep != NULL; ep++) {
strlcat(evstr, *ep, evlen);
strlcat(evstr, " ", evlen); /* NOTE: last one will fail */
}
len += sizeof(LL_ENV_STR) + 2 + evlen;
}
if (user_cmnd != NULL) {
/* Note: we log "sudo -l command arg ..." as "list command arg ..." */
len += sizeof(LL_CMND_STR) - 1 + strlen(user_cmnd);
if (ISSET(sudo_mode, MODE_CHECK))
len += sizeof("list ") - 1;
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 (tsid != NULL) {
if (strlcat(line, LL_TSID_STR, len) >= len ||
strlcat(line, tsid, 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 (user_cmnd != NULL) {
if (strlcat(line, LL_CMND_STR, len) >= len)
goto toobig;
if (ISSET(sudo_mode, MODE_CHECK) && strlcat(line, "list ", len) >= len)
goto toobig;
if (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;
}
}
debug_return_str(line);
toobig:
errorx(1, _("internal error: insufficient space for log line"));
}
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