#include "login_locl.h"
RCSID("$Id$");
static char fs[] = ":";
static char sep[] = ", \t";
#define YES 1
#define NO 0
struct login_info {
struct passwd *user;
char *from;
};
static int list_match(char *list, struct login_info *item,
int (*match_fn)(char *, struct login_info *));
static int user_match(char *tok, struct login_info *item);
static int from_match(char *tok, struct login_info *item);
static int string_match(char *tok, char *string);
int login_access(struct passwd *user, char *from)
{
struct login_info item;
FILE *fp;
char line[BUFSIZ];
char *perm;
char *users;
char *froms;
int match = NO;
int end;
int lineno = 0;
char *foo;
item.user = user;
item.from = from;
if ((fp = fopen(_PATH_LOGACCESS, "r")) != 0) {
while (!match && fgets(line, sizeof(line), fp)) {
lineno++;
if (line[end = strlen(line) - 1] != '\n') {
syslog(LOG_ERR, "%s: line %d: missing newline or line too long",
_PATH_LOGACCESS, lineno);
continue;
}
if (line[0] == '#')
continue;
while (end > 0 && isspace((unsigned char)line[end - 1]))
end--;
line[end] = 0;
if (line[0] == 0)
continue;
foo = NULL;
if (!(perm = strtok_r(line, fs, &foo))
|| !(users = strtok_r(NULL, fs, &foo))
|| !(froms = strtok_r(NULL, fs, &foo))
|| strtok_r(NULL, fs, &foo)) {
syslog(LOG_ERR, "%s: line %d: bad field count",
_PATH_LOGACCESS,
lineno);
continue;
}
if (perm[0] != '+' && perm[0] != '-') {
syslog(LOG_ERR, "%s: line %d: bad first field",
_PATH_LOGACCESS,
lineno);
continue;
}
match = (list_match(froms, &item, from_match)
&& list_match(users, &item, user_match));
}
fclose(fp);
} else if (errno != ENOENT) {
syslog(LOG_ERR, "cannot open %s: %m", _PATH_LOGACCESS);
}
return (match == 0 || (line[0] == '+'));
}
static int
list_match(char *list,
struct login_info *item,
int (*match_fn)(char *, struct login_info *))
{
char *tok;
int match = NO;
char *foo = NULL;
for (tok = strtok_r(list, sep, &foo);
tok != NULL;
tok = strtok_r(NULL, sep, &foo)) {
if (strcasecmp(tok, "EXCEPT") == 0)
break;
if ((match = (*match_fn) (tok, item)) != 0)
break;
}
if (match != NO) {
while ((tok = strtok_r(NULL, sep, &foo)) && strcasecmp(tok, "EXCEPT"))
;
if (tok == 0 || list_match(NULL, item, match_fn) == NO)
return (match);
}
return (NO);
}
static char *myhostname(void)
{
static char name[MAXHOSTNAMELEN + 1] = "";
if (name[0] == 0) {
gethostname(name, sizeof(name));
name[MAXHOSTNAMELEN] = 0;
}
return (name);
}
static int netgroup_match(char *group, char *machine, char *user)
{
#ifdef HAVE_YP_GET_DEFAULT_DOMAIN
static char *mydomain = 0;
if (mydomain == 0)
yp_get_default_domain(&mydomain);
return (innetgr(group, machine, user, mydomain));
#else
syslog(LOG_ERR, "NIS netgroup support not configured");
return 0;
#endif
}
static int user_match(char *tok, struct login_info *item)
{
char *string = item->user->pw_name;
struct login_info fake_item;
struct group *group;
int i;
char *at;
if ((at = strchr(tok + 1, '@')) != 0) {
*at = 0;
fake_item.from = myhostname();
return (user_match(tok, item) && from_match(at + 1, &fake_item));
} else if (tok[0] == '@') {
return (netgroup_match(tok + 1, (char *) 0, string));
} else if (string_match(tok, string)) {
return (YES);
} else if ((group = getgrnam(tok)) != 0) {
if (item->user->pw_gid == group->gr_gid)
return (YES);
for (i = 0; group->gr_mem[i]; i++)
if (strcasecmp(string, group->gr_mem[i]) == 0)
return (YES);
}
return (NO);
}
static int from_match(char *tok, struct login_info *item)
{
char *string = item->from;
int tok_len;
int str_len;
if (tok[0] == '@') {
return (netgroup_match(tok + 1, string, (char *) 0));
} else if (string_match(tok, string)) {
return (YES);
} else if (tok[0] == '.') {
if ((str_len = strlen(string)) > (tok_len = strlen(tok))
&& strcasecmp(tok, string + str_len - tok_len) == 0)
return (YES);
} else if (strcasecmp(tok, "LOCAL") == 0) {
if (strchr(string, '.') == 0)
return (YES);
} else if (tok[(tok_len = strlen(tok)) - 1] == '.'
&& strncmp(tok, string, tok_len) == 0) {
return (YES);
}
return (NO);
}
static int string_match(char *tok, char *string)
{
if (strcasecmp(tok, "ALL") == 0) {
return (YES);
} else if (strcasecmp(tok, string) == 0) {
return (YES);
}
return (NO);
}