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#include "e.h"
#ifdef HAVE_PAM
# include <security/pam_appl.h>
# include <pwd.h>
typedef struct E_Auth
{
struct
{
struct pam_conv conv;
pam_handle_t *handle;
} pam;
char user[4096];
char passwd[4096];
} E_Auth;
static pid_t _e_auth_child_pid = -1;
static char *
_auth_auth_get_current_user(void)
{
char *user;
struct passwd *pwent = NULL;
pwent = getpwuid(getuid());
user = strdup(pwent->pw_name);
return user;
}
static int
_auth_auth_pam_conv(int num_msg, const struct pam_message **msg, struct pam_response **resp, void *appdata_ptr)
{
int replies = 0;
E_Auth *da = (E_Auth *)appdata_ptr;
struct pam_response *reply = NULL;
reply = (struct pam_response *)malloc(sizeof(struct pam_response) * num_msg);
if (!reply) return PAM_CONV_ERR;
for (replies = 0; replies < num_msg; replies++)
{
switch (msg[replies]->msg_style)
{
case PAM_PROMPT_ECHO_ON:
reply[replies].resp_retcode = PAM_SUCCESS;
reply[replies].resp = strdup(da->user);
break;
case PAM_PROMPT_ECHO_OFF:
reply[replies].resp_retcode = PAM_SUCCESS;
reply[replies].resp = strdup(da->passwd);
break;
case PAM_ERROR_MSG:
case PAM_TEXT_INFO:
reply[replies].resp_retcode = PAM_SUCCESS;
reply[replies].resp = NULL;
break;
default:
free(reply);
return PAM_CONV_ERR;
}
}
*resp = reply;
return PAM_SUCCESS;
}
static int
_auth_pam_init(E_Auth *da)
{
int pamerr;
const char *pam_prof;
char *current_host;
char *current_user;
if (!da) return -1;
da->pam.conv.conv = _auth_auth_pam_conv;
da->pam.conv.appdata_ptr = da;
da->pam.handle = NULL;
/* try other pam profiles - and system-auth (login for fbsd users) is a fallback */
pam_prof = "login";
if (ecore_file_exists("/etc/pam.d/enlightenment"))
pam_prof = "enlightenment";
else if (ecore_file_exists("/etc/pam.d/xscreensaver"))
pam_prof = "xscreensaver";
else if (ecore_file_exists("/etc/pam.d/kscreensaver"))
pam_prof = "kscreensaver";
else if (ecore_file_exists("/etc/pam.d/system-auth"))
pam_prof = "system-auth";
else if (ecore_file_exists("/etc/pam.d/system"))
pam_prof = "system";
else if (ecore_file_exists("/etc/pam.d/xdm"))
pam_prof = "xdm";
else if (ecore_file_exists("/etc/pam.d/gdm"))
pam_prof = "gdm";
else if (ecore_file_exists("/etc/pam.d/kdm"))
pam_prof = "kdm";
if ((pamerr = pam_start(pam_prof, da->user, &(da->pam.conv),
&(da->pam.handle))) != PAM_SUCCESS)
return pamerr;
current_user = _auth_auth_get_current_user();
if ((pamerr = pam_set_item(da->pam.handle, PAM_USER, current_user)) != PAM_SUCCESS)
{
free(current_user);
return pamerr;
}
current_host = e_auth_hostname_get();
if ((pamerr = pam_set_item(da->pam.handle, PAM_RHOST, current_host)) != PAM_SUCCESS)
{
free(current_user);
free(current_host);
return pamerr;
}
free(current_user);
free(current_host);
return 0;
}
#endif
EAPI int
e_auth_begin(char *passwd)
{
#ifdef HAVE_PAM
/* child */
int pamerr;
E_Auth da;
char *current_user, *p;
struct sigaction action;
_e_auth_child_pid = fork();
if (_e_auth_child_pid > 0) return _e_auth_child_pid;
if (_e_auth_child_pid < 0) return -1;
action.sa_handler = SIG_DFL;
action.sa_flags = SA_ONSTACK | SA_NODEFER | SA_RESETHAND | SA_SIGINFO;
sigemptyset(&action.sa_mask);
sigaction(SIGSEGV, &action, NULL);
sigaction(SIGILL, &action, NULL);
sigaction(SIGFPE, &action, NULL);
sigaction(SIGBUS, &action, NULL);
sigaction(SIGABRT, &action, NULL);
current_user = _auth_auth_get_current_user();
eina_strlcpy(da.user, current_user, sizeof(da.user));
eina_strlcpy(da.passwd, passwd, sizeof(da.passwd));
/* security - null out passwd string once we are done with it */
for (p = passwd; *p; p++)
*p = 0;
da.pam.handle = NULL;
da.pam.conv.conv = NULL;
da.pam.conv.appdata_ptr = NULL;
pamerr = _auth_pam_init(&da);
if (pamerr != PAM_SUCCESS)
{
free(current_user);
exit(1);
}
pamerr = pam_authenticate(da.pam.handle, 0);
pam_end(da.pam.handle, pamerr);
/* security - null out passwd string once we are done with it */
memset(da.passwd, 0, sizeof(da.passwd));
if (pamerr == PAM_SUCCESS)
{
free(current_user);
exit(0);
}
free(current_user);
exit(-1);
#endif
return 0;
}
EAPI char *
e_auth_hostname_get(void)
{
return strdup("localhost");
}
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