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/*
* Virtual domain support.
*/
#include "params.h"
#if POP_VIRTUAL
/* Inhibits NI_MAXHOST definition if present: #define _XOPEN_SOURCE 4 */
#define _XOPEN_SOURCE_EXTENDED
#define _XOPEN_VERSION 4
#define _XPG4_2
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <errno.h>
#include <pwd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#ifndef NAME_MAX
#define NAME_MAX 255
#endif
#include "misc.h"
extern int log_error(char *s);
char *virtual_domain;
char *virtual_spool;
int virtual_startup(void)
{
return 0;
}
static char *lookup(void)
{
struct sockaddr_storage ss;
socklen_t length;
int error;
static char hbuf[NI_MAXHOST];
length = sizeof(ss);
if (getsockname(0, (struct sockaddr *)&ss, &length)) {
if (errno == ENOTSOCK) {
hbuf[0] = '\0';
return hbuf;
}
log_error("getsockname");
return NULL;
}
error = getnameinfo((struct sockaddr *)&ss, length, hbuf, sizeof(hbuf),
NULL, 0, NI_NUMERICHOST);
if (error) {
log_error("getnameinfo");
return NULL;
}
return hbuf;
}
static int is_valid_user(char *user)
{
unsigned char *p;
/* This is pretty liberal, but we're going to use direct syscalls only,
* and they have to accept all the printable characters */
for (p = (unsigned char *)user; *p; p++)
if (*p < ' ' || *p > 0x7E || *p == '.' || *p == '/') return 0;
if (p - (unsigned char *)user > NAME_MAX) return 0;
return 1;
}
struct passwd *virtual_userpass(char *user, char *pass, int *known)
{
struct passwd *pw, *result;
struct stat stat;
char auth[VIRTUAL_AUTH_SIZE];
char *address, *pathname;
char *template, *passwd;
int fail;
int fd, size;
*known = 0;
/* Make sure we don't try to authenticate globally if something fails
* before we find out whether the virtual domain is known to us */
virtual_domain = "UNKNOWN";
virtual_spool = NULL;
if (!(address = lookup())) return NULL;
/* Authenticate globally (if supported) if run on a non-socket */
if (!*address) {
virtual_domain = NULL;
return NULL;
}
fail = 0;
if (!is_valid_user(user)) {
user = "INVALID";
fail = 1;
}
/* This "can't happen", but is just too critical to not check explicitly */
if (strchr(address, '/') || strchr(user, '/'))
return NULL;
pathname = concat(VIRTUAL_HOME_PATH, "/", address, NULL);
if (!pathname) return NULL;
if (lstat(pathname, &stat)) {
free(pathname);
if (errno == ENOENT)
virtual_domain = NULL;
else
log_error("lstat");
return NULL;
}
free(pathname);
virtual_domain = address;
pathname = concat(VIRTUAL_HOME_PATH, "/", address, "/",
VIRTUAL_AUTH_PATH, "/", user, NULL);
if (!pathname) return NULL;
if ((fd = open(pathname, O_RDONLY)) < 0 && errno != ENOENT) {
log_error("open");
fail = 1;
}
free(pathname);
virtual_spool = concat(VIRTUAL_HOME_PATH, "/", virtual_domain, "/",
VIRTUAL_SPOOL_PATH, NULL);
if (!virtual_spool) {
if (fd >= 0) close(fd);
return NULL;
}
size = 0;
if (fd >= 0) {
*known = !fail;
if ((size = read(fd, auth, sizeof(auth))) < 0) {
log_error("read");
size = 0;
fail = 1;
}
close(fd);
}
if (size >= sizeof(auth)) {
size = 0;
fail = 1;
}
auth[size] = 0;
if (!(template = strtok(auth, ":")) || !*template) {
template = "INVALID";
fail = 1;
}
if (!(passwd = strtok(NULL, ":")) || !*passwd ||
*passwd == '*' || *passwd == '!') {
passwd = AUTH_DUMMY_SALT;
fail = 1;
}
if (!strtok(NULL, ":")) fail = 1;
if ((pw = getpwnam(template)))
memset(pw->pw_passwd, 0, strlen(pw->pw_passwd));
endpwent();
result = NULL;
{
char *computed_hash = crypt(pass, passwd);
if (computed_hash && !strcmp(computed_hash, passwd) && !fail)
result = pw;
}
memset(auth, 0, sizeof(auth));
return result;
}
#endif
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