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/*
common.c - common server code routines
This file is part of the nss-pam-ldapd library.
Copyright (C) 2006 West Consulting
Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Arthur de Jong
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "config.h"
#include <stdio.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <strings.h>
#include <limits.h>
#include <netdb.h>
#include <string.h>
#include <regex.h>
#include <stdlib.h>
#include <signal.h>
#include "nslcd.h"
#include "common.h"
#include "log.h"
#include "cfg.h"
/* simple wrapper around snptintf() to return non-zero in case
of any failure (but always keep string 0-terminated) */
int mysnprintf(char *buffer, size_t buflen, const char *format, ...)
{
int res;
va_list ap;
/* do snprintf */
va_start(ap, format);
res = vsnprintf(buffer, buflen, format, ap);
va_end(ap);
/* NULL-terminate the string just to be on the safe side */
buffer[buflen - 1] = '\0';
/* check if the string was completely written */
return ((res < 0) || (((size_t)res) >= buflen));
}
/* get a name of a signal with a given signal number */
const char *signame(int signum)
{
switch (signum)
{
case SIGHUP: return "SIGHUP"; /* Hangup detected */
case SIGINT: return "SIGINT"; /* Interrupt from keyboard */
case SIGQUIT: return "SIGQUIT"; /* Quit from keyboard */
case SIGILL: return "SIGILL"; /* Illegal Instruction */
case SIGABRT: return "SIGABRT"; /* Abort signal from abort(3) */
case SIGFPE: return "SIGFPE"; /* Floating point exception */
case SIGKILL: return "SIGKILL"; /* Kill signal */
case SIGSEGV: return "SIGSEGV"; /* Invalid memory reference */
case SIGPIPE: return "SIGPIPE"; /* Broken pipe */
case SIGALRM: return "SIGALRM"; /* Timer signal from alarm(2) */
case SIGTERM: return "SIGTERM"; /* Termination signal */
case SIGUSR1: return "SIGUSR1"; /* User-defined signal 1 */
case SIGUSR2: return "SIGUSR2"; /* User-defined signal 2 */
case SIGCHLD: return "SIGCHLD"; /* Child stopped or terminated */
case SIGCONT: return "SIGCONT"; /* Continue if stopped */
case SIGSTOP: return "SIGSTOP"; /* Stop process */
case SIGTSTP: return "SIGTSTP"; /* Stop typed at tty */
case SIGTTIN: return "SIGTTIN"; /* tty input for background process */
case SIGTTOU: return "SIGTTOU"; /* tty output for background process */
#ifdef SIGBUS
case SIGBUS: return "SIGBUS"; /* Bus error */
#endif
#ifdef SIGPOLL
case SIGPOLL: return "SIGPOLL"; /* Pollable event */
#endif
#ifdef SIGPROF
case SIGPROF: return "SIGPROF"; /* Profiling timer expired */
#endif
#ifdef SIGSYS
case SIGSYS: return "SIGSYS"; /* Bad argument to routine */
#endif
#ifdef SIGTRAP
case SIGTRAP: return "SIGTRAP"; /* Trace/breakpoint trap */
#endif
#ifdef SIGURG
case SIGURG: return "SIGURG"; /* Urgent condition on socket */
#endif
#ifdef SIGVTALRM
case SIGVTALRM: return "SIGVTALRM"; /* Virtual alarm clock */
#endif
#ifdef SIGXCPU
case SIGXCPU: return "SIGXCPU"; /* CPU time limit exceeded */
#endif
#ifdef SIGXFSZ
case SIGXFSZ: return "SIGXFSZ"; /* File size limit exceeded */
#endif
default: return "UNKNOWN";
}
}
/* Checks if the specified name seems to be a valid user or group name. */
int isvalidname(const char *name)
{
return regexec(&nslcd_cfg->validnames, name, 0, NULL, 0) == 0;
}
/* convert the provided string representation of a sid
(e.g. S-1-5-21-1936905831-823966427-12391542-23578)
to a format that can be used to search the objectSid property with */
char *sid2search(const char *sid)
{
const char *tmpsid = sid;
char *res, *tmp;
int i = 0;
long int l;
/* check the beginning of the string */
if (strncasecmp(sid, "S-", 2) != 0)
{
log_log(LOG_ERR, "error in SID %s", sid);
exit(EXIT_FAILURE);
}
/* count the number of dashes in the sid */
while (tmpsid != NULL)
{
i++;
tmpsid = strchr(tmpsid + 1, '-');
}
i -= 2; /* number of security ids plus one because we add the uid later */
/* allocate memory */
res = malloc(3 + 3 + 6 * 3 + i * 4 * 3 + 1);
if (res == NULL)
{
log_log(LOG_CRIT, "malloc() failed to allocate memory");
exit(1);
}
/* build the first part */
l = strtol(sid + 2, &tmp, 10);
sprintf(res, "\\%02x\\%02x", (int)l & 0xff, (int)i);
/* build authority part (we only handle 32 of the 48 bits) */
l = strtol(tmp + 1, &tmp, 10);
sprintf(res + strlen(res), "\\00\\00\\%02x\\%02x\\%02x\\%02x",
(int)((l >> 24) & 0xff), (int)((l >> 16) & 0xff),
(int)((l >> 8) & 0xff), (int)(l & 0xff));
/* go over the rest of the bits */
while (*tmp != '\0')
{
l = strtol(tmp + 1, &tmp, 10);
sprintf(res + strlen(res), "\\%02x\\%02x\\%02x\\%02x",
(int)(l & 0xff), (int)((l >> 8) & 0xff), (int)((l >> 16) & 0xff),
(int)((l >> 24) & 0xff));
}
return res;
}
/* return the last security identifier of the binary sid */
long int binsid2id(const char *binsid)
{
int i;
/* find the position of the last security id */
i = 2 + 6 + ((((int)binsid[1]) & 0xff) - 1) * 4;
return (((long int)binsid[i]) & 0xff) |
((((long int)binsid[i + 1]) & 0xff) << 8) |
((((long int)binsid[i + 2]) & 0xff) << 16) |
((((long int)binsid[i + 3]) & 0xff) << 24);
}
#ifdef WANT_STRTOUI
/* provide a strtoui() implementation, similar to strtoul() but returning
an range-checked unsigned int instead */
unsigned int strtoui(const char *nptr, char **endptr, int base)
{
unsigned long val;
val = strtoul(nptr, endptr, base);
if (val > UINT_MAX)
{
errno = ERANGE;
return UINT_MAX;
}
/* If errno was set by strtoul, we'll pass it back as-is */
return (unsigned int)val;
}
#endif /* WANT_STRTOUI */
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