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/*
* utils/mountd/auth.c
*
* Authentication procedures for mountd.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include "misc.h"
#include "nfslib.h"
#include "exportfs.h"
#include "mountd.h"
#include "xmalloc.h"
enum auth_error
{
bad_path,
unknown_host,
no_entry,
not_exported,
illegal_port,
success
};
static void auth_fixpath(char *path);
static char *export_file = NULL;
static nfs_export my_exp;
static nfs_client my_client;
extern int new_cache;
void
auth_init(char *exports)
{
export_file = exports;
auth_reload();
xtab_mount_write();
}
int
auth_reload()
{
struct stat stb;
static time_t last_modified = 0;
if (stat(_PATH_ETAB, &stb) < 0)
xlog(L_FATAL, "couldn't stat %s", _PATH_ETAB);
if (stb.st_mtime == last_modified)
return 0;
last_modified = stb.st_mtime;
export_freeall();
memset(&my_client, 0, sizeof(my_client));
// export_read(export_file);
xtab_export_read();
return 1;
}
static nfs_export *
auth_authenticate_internal(char *what, struct sockaddr_in *caller,
char *path, struct hostent *hp,
enum auth_error *error)
{
nfs_export *exp;
if (new_cache) {
int i;
/* return static nfs_export with details filled in */
if (my_client.m_naddr != 1 ||
my_client.m_addrlist[0].s_addr != caller->sin_addr.s_addr) {
/* different client to last time, so do a lookup */
char *n;
my_client.m_naddr = 0;
my_client.m_addrlist[0] = caller->sin_addr;
n = client_compose(caller->sin_addr);
*error = unknown_host;
if (!n)
return NULL;
strcpy(my_client.m_hostname, *n?n:"DEFAULT");
free(n);
my_client.m_naddr = 1;
}
my_exp.m_client = &my_client;
exp = NULL;
for (i = 0; !exp && i < MCL_MAXTYPES; i++)
for (exp = exportlist[i]; exp; exp = exp->m_next) {
if (!client_member(my_client.m_hostname, exp->m_client->m_hostname))
continue;
if (strcmp(path, exp->m_export.e_path))
continue;
break;
}
*error = not_exported;
if (!exp)
return exp;
my_exp.m_export = exp->m_export;
exp = &my_exp;
} else {
if (!(exp = export_find(hp, path))) {
*error = no_entry;
return NULL;
}
if (!exp->m_mayexport) {
*error = not_exported;
return NULL;
}
}
if (!(exp->m_export.e_flags & NFSEXP_INSECURE_PORT) &&
(ntohs(caller->sin_port) < IPPORT_RESERVED/2 ||
ntohs(caller->sin_port) >= IPPORT_RESERVED)) {
*error = illegal_port;
return NULL;
}
*error = success;
return exp;
}
nfs_export *
auth_authenticate(char *what, struct sockaddr_in *caller, char *path)
{
nfs_export *exp = NULL;
char epath[MAXPATHLEN+1];
char *p = NULL;
struct hostent *hp = NULL;
struct in_addr addr = caller->sin_addr;
enum auth_error error;
if (path [0] != '/') {
xlog(L_WARNING, "bad path in %s request from %s: \"%s\"",
what, inet_ntoa(addr), path);
return exp;
}
strncpy(epath, path, sizeof (epath) - 1);
epath[sizeof (epath) - 1] = '\0';
auth_fixpath(epath); /* strip duplicate '/' etc */
hp = get_reliable_hostbyaddr((const char*)&caller->sin_addr, sizeof(struct in_addr),
AF_INET);
if (!hp)
hp = get_hostent((const char*)&caller->sin_addr, sizeof(struct in_addr),
AF_INET);
if (!hp)
return exp;
/* Try the longest matching exported pathname. */
while (1) {
exp = auth_authenticate_internal(what, caller, epath,
hp, &error);
if (exp || (error != not_exported && error != no_entry))
break;
/* We have to treat the root, "/", specially. */
if (p == &epath[1]) break;
p = strrchr(epath, '/');
if (p == epath) p++;
*p = '\0';
}
switch (error) {
case bad_path:
xlog(L_WARNING, "bad path in %s request from %s: \"%s\"",
what, inet_ntoa(addr), path);
break;
case unknown_host:
xlog(L_WARNING, "%s request from unknown host %s for %s (%s)",
what, inet_ntoa(addr), path, epath);
break;
case no_entry:
xlog(L_WARNING, "refused %s request from %s for %s (%s): no export entry",
what, hp->h_name, path, epath);
break;
case not_exported:
xlog(L_WARNING, "refused %s request from %s for %s (%s): not exported",
what, hp->h_name, path, epath);
break;
case illegal_port:
xlog(L_WARNING, "refused %s request from %s for %s (%s): illegal port %d",
what, hp->h_name, path, epath, ntohs(caller->sin_port));
break;
case success:
xlog(L_NOTICE, "authenticated %s request from %s:%d for %s (%s)",
what, hp->h_name, ntohs(caller->sin_port), path, epath);
break;
default:
xlog(L_NOTICE, "%s request from %s:%d for %s (%s) gave %d",
what, hp->h_name, ntohs(caller->sin_port), path, epath, error);
}
if (hp)
free (hp);
return exp;
}
static void
auth_fixpath(char *path)
{
char *sp, *cp;
for (sp = cp = path; *sp; sp++) {
if (*sp != '/' || sp[1] != '/')
*cp++ = *sp;
}
while (cp > path+1 && cp[-1] == '/')
cp--;
*cp = '\0';
}
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