#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include "pw.h"
#define debugging 0
enum {
_UC_NONE,
_UC_DEFAULTPWD,
_UC_REUSEUID,
_UC_REUSEGID,
_UC_NISPASSWD,
_UC_DOTDIR,
_UC_NEWMAIL,
_UC_LOGFILE,
_UC_HOMEROOT,
_UC_HOMEMODE,
_UC_SHELLPATH,
_UC_SHELLS,
_UC_DEFAULTSHELL,
_UC_DEFAULTGROUP,
_UC_EXTRAGROUPS,
_UC_DEFAULTCLASS,
_UC_MINUID,
_UC_MAXUID,
_UC_MINGID,
_UC_MAXGID,
_UC_EXPIRE,
_UC_PASSWORD,
_UC_FIELDS
};
static char bourne_shell[] = "sh";
static char *system_shells[_UC_MAXSHELLS] =
{
bourne_shell,
"csh",
"tcsh"
};
static char const *booltrue[] =
{
"yes", "true", "1", "on", NULL
};
static char const *boolfalse[] =
{
"no", "false", "0", "off", NULL
};
static struct userconf config =
{
0,
0,
0,
NULL,
"/usr/share/skel",
NULL,
"/var/log/userlog",
"/home",
_DEF_DIRMODE,
"/bin",
system_shells,
bourne_shell,
NULL,
NULL,
NULL,
1000, 32000,
1000, 32000,
0,
0,
0
};
static char const *comments[_UC_FIELDS] =
{
"#\n# pw.conf - user/group configuration defaults\n#\n",
"\n# Password for new users? no=nologin yes=loginid none=blank random=random\n",
"\n# Reuse gaps in uid sequence? (yes or no)\n",
"\n# Reuse gaps in gid sequence? (yes or no)\n",
"\n# Path to the NIS passwd file (blank or 'no' for none)\n",
"\n# Obtain default dotfiles from this directory\n",
"\n# Mail this file to new user (/etc/newuser.msg or no)\n",
"\n# Log add/change/remove information in this file\n",
"\n# Root directory in which $HOME directory is created\n",
"\n# Mode for the new $HOME directory, will be modified by umask\n",
"\n# Colon separated list of directories containing valid shells\n",
"\n# Comma separated list of available shells (without paths)\n",
"\n# Default shell (without path)\n",
"\n# Default group (leave blank for new group per user)\n",
"\n# Extra groups for new users\n",
"\n# Default login class for new users\n",
"\n# Range of valid default user ids\n",
NULL,
"\n# Range of valid default group ids\n",
NULL,
"\n# Days after which account expires (0=disabled)\n",
"\n# Days after which password expires (0=disabled)\n"
};
static char const *kwds[] =
{
"",
"defaultpasswd",
"reuseuids",
"reusegids",
"nispasswd",
"skeleton",
"newmail",
"logfile",
"home",
"homemode",
"shellpath",
"shells",
"defaultshell",
"defaultgroup",
"extragroups",
"defaultclass",
"minuid",
"maxuid",
"mingid",
"maxgid",
"expire_days",
"password_days",
NULL
};
static char *
unquote(char const * str)
{
if (str && (*str == '"' || *str == '\'')) {
char *p = strchr(str + 1, *str);
if (p != NULL)
*p = '\0';
return (char *) (*++str ? str : NULL);
}
return (char *) str;
}
int
boolean_val(char const * str, int dflt)
{
if ((str = unquote(str)) != NULL) {
int i;
for (i = 0; booltrue[i]; i++)
if (strcmp(str, booltrue[i]) == 0)
return 1;
for (i = 0; boolfalse[i]; i++)
if (strcmp(str, boolfalse[i]) == 0)
return 0;
if (strcmp(str, "random") == 0)
return -1;
if (strcmp(str, "none") == 0)
return -2;
}
return dflt;
}
char const *
boolean_str(int val)
{
if (val == -1)
return "random";
else if (val == -2)
return "none";
else
return val ? booltrue[0] : boolfalse[0];
}
char *
newstr(char const * p)
{
char *q = NULL;
if ((p = unquote(p)) != NULL) {
int l = strlen(p) + 1;
if ((q = malloc(l)) != NULL)
memcpy(q, p, l);
}
return q;
}
#define LNBUFSZ 1024
struct userconf *
read_userconfig(char const * file)
{
FILE *fp;
extendarray(&config.groups, &config.numgroups, 200);
memset(config.groups, 0, config.numgroups * sizeof(char *));
if (file == NULL)
file = _PATH_PW_CONF;
if ((fp = fopen(file, "r")) != NULL) {
int buflen = LNBUFSZ;
char *buf = malloc(buflen);
nextline:
while (fgets(buf, buflen, fp) != NULL) {
char *p;
while ((p = strchr(buf, '\n')) == NULL) {
int l;
if (extendline(&buf, &buflen, buflen + LNBUFSZ) == -1) {
int ch;
while ((ch = fgetc(fp)) != '\n' && ch != EOF);
goto nextline;
}
l = strlen(buf);
if (fgets(buf + l, buflen - l, fp) == NULL)
break;
}
if (p != NULL)
*p = '\0';
if (*buf && (p = strtok(buf, " \t\r\n=")) != NULL && *p != '#') {
static char const toks[] = " \t\r\n,=";
char *q = strtok(NULL, toks);
int i = 0;
mode_t *modeset;
while (i < _UC_FIELDS && strcmp(p, kwds[i]) != 0)
++i;
#if debugging
if (i == _UC_FIELDS)
printf("Got unknown kwd `%s' val=`%s'\n", p, q ? q : "");
else
printf("Got kwd[%s]=%s\n", p, q);
#endif
switch (i) {
case _UC_DEFAULTPWD:
config.default_password = boolean_val(q, 1);
break;
case _UC_REUSEUID:
config.reuse_uids = boolean_val(q, 0);
break;
case _UC_REUSEGID:
config.reuse_gids = boolean_val(q, 0);
break;
case _UC_NISPASSWD:
config.nispasswd = (q == NULL || !boolean_val(q, 1))
? NULL : newstr(q);
break;
case _UC_DOTDIR:
config.dotdir = (q == NULL || !boolean_val(q, 1))
? NULL : newstr(q);
break;
case _UC_NEWMAIL:
config.newmail = (q == NULL || !boolean_val(q, 1))
? NULL : newstr(q);
break;
case _UC_LOGFILE:
config.logfile = (q == NULL || !boolean_val(q, 1))
? NULL : newstr(q);
break;
case _UC_HOMEROOT:
config.home = (q == NULL || !boolean_val(q, 1))
? "/home" : newstr(q);
break;
case _UC_HOMEMODE:
modeset = setmode(q);
config.homemode = (q == NULL || !boolean_val(q, 1))
? _DEF_DIRMODE : getmode(modeset, _DEF_DIRMODE);
free(modeset);
break;
case _UC_SHELLPATH:
config.shelldir = (q == NULL || !boolean_val(q, 1))
? "/bin" : newstr(q);
break;
case _UC_SHELLS:
for (i = 0; i < _UC_MAXSHELLS && q != NULL; i++, q = strtok(NULL, toks))
system_shells[i] = newstr(q);
if (i > 0)
while (i < _UC_MAXSHELLS)
system_shells[i++] = NULL;
break;
case _UC_DEFAULTSHELL:
config.shell_default = (q == NULL || !boolean_val(q, 1))
? (char *) bourne_shell : newstr(q);
break;
case _UC_DEFAULTGROUP:
q = unquote(q);
config.default_group = (q == NULL || !boolean_val(q, 1) || GETGRNAM(q) == NULL)
? NULL : newstr(q);
break;
case _UC_EXTRAGROUPS:
for (i = 0; q != NULL; q = strtok(NULL, toks)) {
if (extendarray(&config.groups, &config.numgroups, i + 2) != -1)
config.groups[i++] = newstr(q);
}
if (i > 0)
while (i < config.numgroups)
config.groups[i++] = NULL;
break;
case _UC_DEFAULTCLASS:
config.default_class = (q == NULL || !boolean_val(q, 1))
? NULL : newstr(q);
break;
case _UC_MINUID:
if ((q = unquote(q)) != NULL && isdigit(*q))
config.min_uid = (uid_t) atol(q);
break;
case _UC_MAXUID:
if ((q = unquote(q)) != NULL && isdigit(*q))
config.max_uid = (uid_t) atol(q);
break;
case _UC_MINGID:
if ((q = unquote(q)) != NULL && isdigit(*q))
config.min_gid = (gid_t) atol(q);
break;
case _UC_MAXGID:
if ((q = unquote(q)) != NULL && isdigit(*q))
config.max_gid = (gid_t) atol(q);
break;
case _UC_EXPIRE:
if ((q = unquote(q)) != NULL && isdigit(*q))
config.expire_days = atoi(q);
break;
case _UC_PASSWORD:
if ((q = unquote(q)) != NULL && isdigit(*q))
config.password_days = atoi(q);
break;
case _UC_FIELDS:
case _UC_NONE:
break;
}
}
}
free(buf);
fclose(fp);
}
return &config;
}
int
write_userconfig(char const * file)
{
int fd;
if (file == NULL)
file = _PATH_PW_CONF;
if ((fd = open(file, O_CREAT | O_RDWR | O_TRUNC | O_EXLOCK, 0644)) != -1) {
FILE *fp;
if ((fp = fdopen(fd, "w")) == NULL)
close(fd);
else {
int i, j, k;
int len = LNBUFSZ;
char *buf = malloc(len);
for (i = _UC_NONE; i < _UC_FIELDS; i++) {
int quote = 1;
char const *val = buf;
*buf = '\0';
switch (i) {
case _UC_DEFAULTPWD:
val = boolean_str(config.default_password);
break;
case _UC_REUSEUID:
val = boolean_str(config.reuse_uids);
break;
case _UC_REUSEGID:
val = boolean_str(config.reuse_gids);
break;
case _UC_NISPASSWD:
val = config.nispasswd ? config.nispasswd : "";
quote = 0;
break;
case _UC_DOTDIR:
val = config.dotdir ? config.dotdir : boolean_str(0);
break;
case _UC_NEWMAIL:
val = config.newmail ? config.newmail : boolean_str(0);
break;
case _UC_LOGFILE:
val = config.logfile ? config.logfile : boolean_str(0);
break;
case _UC_HOMEROOT:
val = config.home;
break;
case _UC_HOMEMODE:
sprintf(buf, "%04o", config.homemode);
quote = 0;
break;
case _UC_SHELLPATH:
val = config.shelldir;
break;
case _UC_SHELLS:
for (j = k = 0; j < _UC_MAXSHELLS && system_shells[j] != NULL; j++) {
char lbuf[64];
int l = snprintf(lbuf, sizeof lbuf, "%s\"%s\"", k ? "," : "", system_shells[j]);
if (l < 0)
l = 0;
if (l + k + 1 < len || extendline(&buf, &len, len + LNBUFSZ) != -1) {
strcpy(buf + k, lbuf);
k += l;
}
}
quote = 0;
break;
case _UC_DEFAULTSHELL:
val = config.shell_default ? config.shell_default : bourne_shell;
break;
case _UC_DEFAULTGROUP:
val = config.default_group ? config.default_group : "";
break;
case _UC_EXTRAGROUPS:
extendarray(&config.groups, &config.numgroups, 200);
for (j = k = 0; j < config.numgroups && config.groups[j] != NULL; j++) {
char lbuf[64];
int l = snprintf(lbuf, sizeof lbuf, "%s\"%s\"", k ? "," : "", config.groups[j]);
if (l < 0)
l = 0;
if (l + k + 1 < len || extendline(&buf, &len, len + 1024) != -1) {
strcpy(buf + k, lbuf);
k += l;
}
}
quote = 0;
break;
case _UC_DEFAULTCLASS:
val = config.default_class ? config.default_class : "";
break;
case _UC_MINUID:
sprintf(buf, "%lu", (unsigned long) config.min_uid);
quote = 0;
break;
case _UC_MAXUID:
sprintf(buf, "%lu", (unsigned long) config.max_uid);
quote = 0;
break;
case _UC_MINGID:
sprintf(buf, "%lu", (unsigned long) config.min_gid);
quote = 0;
break;
case _UC_MAXGID:
sprintf(buf, "%lu", (unsigned long) config.max_gid);
quote = 0;
break;
case _UC_EXPIRE:
sprintf(buf, "%d", config.expire_days);
quote = 0;
break;
case _UC_PASSWORD:
sprintf(buf, "%d", config.password_days);
quote = 0;
break;
case _UC_NONE:
break;
}
if (comments[i])
fputs(comments[i], fp);
if (*kwds[i]) {
if (quote)
fprintf(fp, "%s = \"%s\"\n", kwds[i], val);
else
fprintf(fp, "%s = %s\n", kwds[i], val);
#if debugging
printf("WROTE: %s = %s\n", kwds[i], val);
#endif
}
}
free(buf);
return fclose(fp) != EOF;
}
}
return 0;
}
