* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
-/**
+/**
** loginrec.c: platform-independent login recording and lastlog retrieval
**/
requires very thorough testing so we do not corrupt local auditing
information. These files and their access methods are very system
specific indeed.
-
+
For utmpx systems, the corresponding library functions are
setutxent() etc. To the author's knowledge, all utmpx systems have
these library functions and so no direct write is attempted. If such
Calling the new code
--------------------
-
+
In OpenSSH all login recording and retrieval is performed in
login.c. Here you'll find working examples. Also, in the logintest.c
program there are more examples.
Internal handler calling method
-------------------------------
-
+
When a call is made to login_login() or login_logout(), both
routines set a struct logininfo flag defining which action (log in,
or log out) is to be taken. They both then call login_write(), which
symbols for the platform.
Use logintest to check which symbols are defined before modifying
- configure.in and loginrec.c. (You have to build logintest yourself
+ configure.ac and loginrec.c. (You have to build logintest yourself
with 'make logintest' as it's not built by default.)
Otherwise, patches to the specific method(s) are very helpful!
-
+
*/
/**
** TODO:
- ** homegrown ttyslot()q
+ ** homegrown ttyslot()
** test, test, test
**
** Platform status:
** ----------------
**
** Known good:
- ** Linux (Redhat 6.2, need more variants)
+ ** Linux (Redhat 6.2, Debian)
+ ** Solaris
** HP-UX 10.20 (gcc only)
** IRIX
+ ** NeXT - M68k/HPPA/Sparc (4.2/3.3)
**
** Testing required: Please send reports!
- ** Solaris
** NetBSD
** HP-UX 11
** AIX
**
** Platforms with known problems:
- ** NeXT
+ ** Some variants of Slackware Linux
**
**/
#include "includes.h"
-#if HAVE_UTMP_H
-# include <utmp.h>
-#endif
-#if HAVE_UTMPX_H
-# include <utmpx.h>
-#endif
-#if HAVE_LASTLOG_H
-# include <lastlog.h>
-#endif
-
#include "ssh.h"
#include "xmalloc.h"
#include "loginrec.h"
+#include "log.h"
+#include "atomicio.h"
RCSID("$Id$");
+#ifdef HAVE_UTIL_H
+# include <util.h>
+#endif
+
+#ifdef HAVE_LIBUTIL_H
+# include <libutil.h>
+#endif
+
/**
** prototypes for helper functions in this file
**/
**/
/* login_login(struct logininfo *) -Record a login
- *
+ *
* Call with a pointer to a struct logininfo initialised with
* login_init_entry() or login_alloc_entry()
*
{
struct passwd *pw;
- memset(li, '\0', sizeof(struct logininfo));
+ memset(li, '\0', sizeof(*li));
li->uid = uid;
- /*
+ /*
* If we don't have a 'real' lastlog, we need the username to
* reliably search wtmp(x) for the last login (see
- * wtmp_get_entry().)
+ * wtmp_get_entry().)
*/
pw = getpwuid(uid);
if (pw == NULL)
fatal("login_get_lastlog: Cannot find account for uid %i", uid);
-
+
/* No MIN_SIZEOF here - we absolutely *must not* truncate the
- * username */
+ * username */
strlcpy(li->username, pw->pw_name, sizeof(li->username));
if (getlast_entry(li))
/* login_alloc_entry(int, char*, char*, char*) - Allocate and initialise
- * a logininfo structure
- *
+ * a logininfo structure
+ *
* This function creates a new struct logininfo, a data structure
* meant to carry the information required to portably record login info.
*
{
struct logininfo *newli;
- newli = (struct logininfo *) xmalloc (sizeof(struct logininfo));
+ newli = (struct logininfo *) xmalloc (sizeof(*newli));
(void)login_init_entry(newli, pid, username, hostname, line);
return newli;
}
/* login_init_entry(struct logininfo *, int, char*, char*, char*)
* - initialise a struct logininfo
- *
+ *
* Populates a new struct logininfo, a data structure meant to carry
* the information required to portably record login info.
*
* Returns: 1
*/
int
-login_init_entry(struct logininfo *li, int pid, const char *username,
+login_init_entry(struct logininfo *li, int pid, const char *username,
const char *hostname, const char *line)
{
struct passwd *pw;
-
- memset(li, 0, sizeof(struct logininfo));
-
+
+ memset(li, 0, sizeof(*li));
+
li->pid = pid;
/* set the line information */
struct timeval tv;
gettimeofday(&tv, NULL);
-
+
li->tv_sec = tv.tv_sec;
li->tv_usec = tv.tv_usec;
}
int
login_write (struct logininfo *li)
{
+#ifndef HAVE_CYGWIN
if ((int)geteuid() != 0) {
log("Attempt to write login records by non-root user (aborting)");
return 1;
}
+#endif
/* set the timestamp */
login_set_current_time(li);
return 0;
}
+#ifdef LOGIN_NEEDS_UTMPX
+int
+login_utmp_only(struct logininfo *li)
+{
+ li->type = LTYPE_LOGIN;
+ login_set_current_time(li);
+# ifdef USE_UTMP
+ utmp_write_entry(li);
+# endif
+# ifdef USE_WTMP
+ wtmp_write_entry(li);
+# endif
+# ifdef USE_UTMPX
+ utmpx_write_entry(li);
+# endif
+# ifdef USE_WTMPX
+ wtmpx_write_entry(li);
+# endif
+ return 0;
+}
+#endif
+
/**
** getlast_entry: Call low-level functions to retrieve the last login
** time.
#else /* !USE_LASTLOG */
#ifdef DISABLE_LASTLOG
- /* On some systems we shouldn't even try to obtain last login
+ /* On some systems we shouldn't even try to obtain last login
* time, e.g. AIX */
return 0;
# else /* DISABLE_LASTLOG */
return 0;
# endif /* USE_WTMPX && (HAVE_TIME_IN_UTMPX || HAVE_TV_IN_UTMPX) */
# endif /* USE_WTMP && (HAVE_TIME_IN_UTMP || HAVE_TV_IN_UTMP) */
-# endif /* DISABLE_LASTLOG */
+# endif /* DISABLE_LASTLOG */
#endif /* USE_LASTLOG */
}
line_fullname(char *dst, const char *src, int dstsize)
{
memset(dst, '\0', dstsize);
- if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5)))
+ if ((strncmp(src, "/dev/", 5) == 0) || (dstsize < (strlen(src) + 5))) {
strlcpy(dst, src, dstsize);
- else {
+ } else {
strlcpy(dst, "/dev/", dstsize);
strlcat(dst, src, dstsize);
}
{
memset(dst, '\0', dstsize);
if (strncmp(src, "/dev/", 5) == 0)
- strlcpy(dst, &src[5], dstsize);
+ strlcpy(dst, src + 5, dstsize);
else
strlcpy(dst, src, dstsize);
return dst;
* NOTE: use strncpy because we do NOT necessarily want zero
* termination */
char *
-line_abbrevname(char *dst, const char *src, int dstsize)
+line_abbrevname(char *dst, const char *src, int dstsize)
{
size_t len;
-
+
memset(dst, '\0', dstsize);
-
+
+ /* Always skip prefix if present */
+ if (strncmp(src, "/dev/", 5) == 0)
+ src += 5;
+
len = strlen(src);
- if (len <= 0) {
- src += (len - dstsize);
- strncpy(dst, src, dstsize); /* note: _don't_ change this to strlcpy */
+ if (len > 0) {
+ if (((int)len - dstsize) > 0)
+ src += ((int)len - dstsize);
+
+ /* note: _don't_ change this to strlcpy */
+ strncpy(dst, src, (size_t)dstsize);
}
-
+
return dst;
}
construct_utmp(struct logininfo *li,
struct utmp *ut)
{
- memset(ut, '\0', sizeof(struct utmp));
+ memset(ut, '\0', sizeof(*ut));
/* First fill out fields used for both logins and logouts */
switch (li->type) {
case LTYPE_LOGIN:
ut->ut_type = USER_PROCESS;
+#ifdef _CRAY
+ cray_set_tmpdir(ut);
+#endif
break;
case LTYPE_LOGOUT:
ut->ut_type = DEAD_PROCESS;
+#ifdef _CRAY
+ cray_retain_utmp(ut, li->pid);
+#endif
break;
}
# endif
/*
* These fields are only used when logging in, and are blank
- * for logouts.
+ * for logouts.
*/
/* Use strncpy because we don't necessarily want null termination */
- strncpy(ut->ut_user, li->username, MIN_SIZEOF(ut->ut_user, li->username));
+ strncpy(ut->ut_name, li->username, MIN_SIZEOF(ut->ut_name, li->username));
# ifdef HAVE_HOST_IN_UTMP
strncpy(ut->ut_host, li->hostname, MIN_SIZEOF(ut->ut_host, li->hostname));
# endif
/* this is just a 32-bit IP address */
if (li->hostaddr.sa.sa_family == AF_INET)
ut->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
-# endif
+# endif
}
#endif /* USE_UTMP || USE_WTMP || USE_LOGIN */
void
construct_utmpx(struct logininfo *li, struct utmpx *utx)
{
- memset(utx, '\0', sizeof(struct utmpx));
+ memset(utx, '\0', sizeof(*utx));
+# ifdef HAVE_ID_IN_UTMPX
line_abbrevname(utx->ut_id, li->line, sizeof(utx->ut_id));
+# endif
/* this is done here to keep utmp constants out of loginrec.h */
switch (li->type) {
/*
* These fields are only used when logging in, and are blank
- * for logouts.
+ * for logouts.
*/
/* strncpy(): Don't necessarily want null termination */
strncpy(utx->ut_host, li->hostname, MIN_SIZEOF(utx->ut_host, li->hostname));
# endif
# ifdef HAVE_ADDR_IN_UTMPX
- /* FIXME: (ATL) not supported yet */
+ /* this is just a 32-bit IP address */
+ if (li->hostaddr.sa.sa_family == AF_INET)
+ utx->ut_addr = li->hostaddr.sa_in.sin_addr.s_addr;
# endif
# ifdef HAVE_SYSLEN_IN_UTMPX
/* ut_syslen is the length of the utx_host string */
int tty;
/* FIXME: (ATL) ttyslot() needs local implementation */
+
+#if defined(HAVE_GETTTYENT)
+ register struct ttyent *ty;
+
+ tty=0;
+
+ setttyent();
+ while ((struct ttyent *)0 != (ty = getttyent())) {
+ tty++;
+ if (!strncmp(ty->ty_name, ut->ut_line, sizeof(ut->ut_line)))
+ break;
+ }
+ endttyent();
+
+ if((struct ttyent *)0 == ty) {
+ log("utmp_write_entry: tty not found");
+ return(1);
+ }
+#else /* FIXME */
+
tty = ttyslot(); /* seems only to work for /dev/ttyp? style names */
+#endif /* HAVE_GETTTYENT */
+
if (tty > 0 && (fd = open(UTMP_FILE, O_RDWR|O_CREAT, 0644)) >= 0) {
(void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
/*
* If the new ut_line is empty but the old one is not
* and ut_line and ut_name match, preserve the old ut_line.
*/
- if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) &&
- (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') &&
- (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) &&
+ if (atomicio(read, fd, &old_ut, sizeof(old_ut)) == sizeof(old_ut) &&
+ (ut->ut_host[0] == '\0') && (old_ut.ut_host[0] != '\0') &&
+ (strncmp(old_ut.ut_line, ut->ut_line, sizeof(ut->ut_line)) == 0) &&
(strncmp(old_ut.ut_name, ut->ut_name, sizeof(ut->ut_name)) == 0)) {
(void)memcpy(ut->ut_host, old_ut.ut_host, sizeof(ut->ut_host));
}
-
+
(void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
- if (atomicio(write, fd, ut, sizeof(ut)) != sizeof(ut))
+ if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut))
log("utmp_write_direct: error writing %s: %s",
UTMP_FILE, strerror(errno));
-
+
(void)close(fd);
return 1;
} else {
/* write a utmp entry direct to the file */
static int
utmpx_write_direct(struct logininfo *li, struct utmpx *utx)
-{
+{
log("utmpx_write_direct: not implemented!");
return 0;
}
** Low-level wtmp functions
**/
-#ifdef USE_WTMP
+#ifdef USE_WTMP
/* write a wtmp entry direct to the end of the file */
/* This is a slight modification of code in OpenBSD's logwtmp.c */
WTMP_FILE, strerror(errno));
return 0;
}
- if (fstat(fd, &buf) == 0)
+ if (fstat(fd, &buf) == 0)
if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
ftruncate(fd, buf.st_size);
log("wtmp_write: problem writing %s: %s",
/* Notes on fetching login data from wtmp/wtmpx
- *
+ *
* Logouts are usually recorded with (amongst other things) a blank
* username on a given tty line. However, some systems (HP-UX is one)
* leave all fields set, but change the ut_type field to DEAD_PROCESS.
static int
wtmp_islogin(struct logininfo *li, struct utmp *ut)
{
- if (strncmp(li->username, ut->ut_user,
- MIN_SIZEOF(li->username, ut->ut_user)) == 0) {
+ if (strncmp(li->username, ut->ut_name,
+ MIN_SIZEOF(li->username, ut->ut_name)) == 0) {
# ifdef HAVE_TYPE_IN_UTMP
if (ut->ut_type & USER_PROCESS)
return 1;
WTMP_FILE, strerror(errno));
return 0;
}
- if (fstat(fd, &st) != 0) {
+ if (fstat(fd, &st) != 0) {
log("wtmp_get_entry: couldn't stat %s: %s",
WTMP_FILE, strerror(errno));
close(fd);
}
/* Seek to the start of the last struct utmp */
- if (lseek(fd, (off_t)(0-sizeof(struct utmp)), SEEK_END) == -1) {
+ if (lseek(fd, -(off_t)sizeof(struct utmp), SEEK_END) == -1) {
/* Looks like we've got a fresh wtmp file */
close(fd);
return 0;
continue;
}
/* Seek back 2 x struct utmp */
- if (lseek(fd, (off_t)(0-2*sizeof(struct utmp)), SEEK_CUR) == -1) {
+ if (lseek(fd, -(off_t)(2 * sizeof(struct utmp)), SEEK_CUR) == -1) {
/* We've found the start of the file, so quit */
close (fd);
return 0;
return 0;
}
- if (fstat(fd, &buf) == 0)
+ if (fstat(fd, &buf) == 0)
if (atomicio(write, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
ftruncate(fd, buf.st_size);
log("wtmpx_write: problem writing %s: %s",
static int
wtmpx_islogin(struct logininfo *li, struct utmpx *utx)
{
- if ( strncmp(li->username, utx->ut_user,
- MIN_SIZEOF(li->username, utx->ut_user)) == 0 ) {
+ if ( strncmp(li->username, utx->ut_name,
+ MIN_SIZEOF(li->username, utx->ut_name)) == 0 ) {
# ifdef HAVE_TYPE_IN_UTMPX
if (utx->ut_type == USER_PROCESS)
return 1;
WTMPX_FILE, strerror(errno));
return 0;
}
- if (fstat(fd, &st) != 0) {
+ if (fstat(fd, &st) != 0) {
log("wtmpx_get_entry: couldn't stat %s: %s",
WTMP_FILE, strerror(errno));
close(fd);
return 0;
}
-
+
/* Seek to the start of the last struct utmpx */
- if (lseek(fd, (off_t)(0-sizeof(struct utmpx)), SEEK_END) == -1 ) {
+ if (lseek(fd, -(off_t)sizeof(struct utmpx), SEEK_END) == -1 ) {
/* probably a newly rotated wtmpx file */
close(fd);
return 0;
# endif
continue;
}
- if (lseek(fd, (off_t)(0-2*sizeof(struct utmpx)), SEEK_CUR) == -1) {
+ if (lseek(fd, -(off_t)(2 * sizeof(struct utmpx)), SEEK_CUR) == -1) {
close (fd);
return 0;
}
{
struct utmp *ut;
- if (! (ut = (struct utmp *)malloc(sizeof(struct utmp)))) {
+ if (! (ut = (struct utmp *)malloc(sizeof(*ut)))) {
log("syslogin_perform_login: couldn't malloc()");
return 0;
}
{
# ifdef HAVE_LOGOUT
char line[8];
-
+
(void)line_stripname(line, li->line, sizeof(line));
if (!logout(line)) {
# ifdef HAVE_LOGWTMP
} else {
logwtmp(line, "", "");
- }
# endif
+ }
/* FIXME: (ATL - if the need arises) What to do if we have
* login, but no logout? what if logout but no logwtmp? All
* routines are in libutil so they should all be there,
lastlog_construct(struct logininfo *li, struct lastlog *last)
{
/* clear the structure */
- memset(last, '\0', sizeof(struct lastlog));
-
+ memset(last, '\0', sizeof(*last));
+
(void)line_stripname(last->ll_line, li->line, sizeof(last->ll_line));
strlcpy(last->ll_host, li->hostname,
MIN_SIZEOF(last->ll_host, li->hostname));
struct stat st;
if (stat(LASTLOG_FILE, &st) != 0) {
- log("lastlog_perform_login: Couldn't stat %s: %s", LASTLOG_FILE,
+ log("lastlog_perform_login: Couldn't stat %s: %s", LASTLOG_FILE,
strerror(errno));
return 0;
}
lastlog_file, strerror(errno));
return 0;
}
-
- /* find this uid's offset in the lastlog file */
- offset = (off_t) ( (long)li->uid * sizeof(struct lastlog));
- if ( lseek(*fd, offset, SEEK_SET) != offset ) {
- log("lastlog_openseek: %s->lseek(): %s",
- lastlog_file, strerror(errno));
- return 0;
+ if (type == LL_FILE) {
+ /* find this uid's offset in the lastlog file */
+ offset = (off_t) ((long)li->uid * sizeof(struct lastlog));
+
+ if ( lseek(*fd, offset, SEEK_SET) != offset ) {
+ log("lastlog_openseek: %s->lseek(): %s",
+ lastlog_file, strerror(errno));
+ return 0;
+ }
}
+
return 1;
}
/* create our struct lastlog */
lastlog_construct(li, &last);
+ if (!lastlog_openseek(li, &fd, O_RDWR|O_CREAT))
+ return(0);
+
/* write the entry */
- if (lastlog_openseek(li, &fd, O_RDWR|O_CREAT)) {
- if (atomicio(write, fd, &last, sizeof(last)) != sizeof(last)) {
- log("lastlog_write_filemode: Error writing to %s: %s",
- LASTLOG_FILE, strerror(errno));
- return 0;
- }
- return 1;
- } else {
+ if (atomicio(write, fd, &last, sizeof(last)) != sizeof(last)) {
+ close(fd);
+ log("lastlog_write_filemode: Error writing to %s: %s",
+ LASTLOG_FILE, strerror(errno));
return 0;
}
+
+ close(fd);
+ return 1;
}
int
lastlog_populate_entry(struct logininfo *li, struct lastlog *last)
{
line_fullname(li->line, last->ll_line, sizeof(li->line));
- strlcpy(li->hostname, last->ll_host,
+ strlcpy(li->hostname, last->ll_host,
MIN_SIZEOF(li->hostname, last->ll_host));
li->tv_sec = last->ll_time;
}
struct lastlog last;
int fd;
- if (lastlog_openseek(li, &fd, O_RDONLY)) {
- if (atomicio(read, fd, &last, sizeof(last)) != sizeof(last)) {
- log("lastlog_get_entry: Error reading from %s: %s",
- LASTLOG_FILE, strerror(errno));
- return 0;
- } else {
- lastlog_populate_entry(li, &last);
- return 1;
- }
- } else {
- return 0;
+ if (!lastlog_openseek(li, &fd, O_RDONLY))
+ return 0;
+
+ if (atomicio(read, fd, &last, sizeof(last)) != sizeof(last)) {
+ close(fd);
+ log("lastlog_get_entry: Error reading from %s: %s",
+ LASTLOG_FILE, strerror(errno));
+ return 0;
}
+
+ close(fd);
+
+ lastlog_populate_entry(li, &last);
+
+ return 1;
}
#endif /* USE_LASTLOG */
andersk / openssh.git / blobdiff