From d4de5497bd89c408377194b9fa9026ba8e68b634 Mon Sep 17 00:00:00 2001
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From: Kai Kang <kai.kang@windriver.com>
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Date: Mon, 11 Jan 2021 14:11:05 +0800
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Subject: [PATCH 4/8] lxdm.c: add function to change password with pam
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Add function to change user's password when pam is enabled. It is useful
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to change user's password when the password is expired.
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Upstream-Status: Submitted [https://sourceforge.net/p/lxdm/code/merge-requests/1/]
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Signed-off-by: Kai Kang <kai.kang@windriver.com>
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---
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src/lxdm.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
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src/lxdm.h | 1 +
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2 files changed, 69 insertions(+)
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diff --git a/src/lxdm.c b/src/lxdm.c
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index 638c30f..fe17a71 100644
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--- a/src/lxdm.c
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+++ b/src/lxdm.c
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@@ -104,6 +104,10 @@ static int old_tty=1,def_tty = 7,nr_tty=0;
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static int def_display=0;
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static GSList *session_list;
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+#if HAVE_LIBPAM
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+static const char *new_passwd = NULL;
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+#endif
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+
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static void lxdm_startx(LXSession *s);
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static int get_active_vt(void)
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@@ -759,6 +763,69 @@ int lxdm_auth_user(int type,char *user, char *pass, struct passwd **ppw)
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return ret;
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}
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+
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+#if HAVE_LIBPAM
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+
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+static int do_conv(int num, const struct pam_message **msg,struct pam_response **resp, void *arg)
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+{
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+ int result = PAM_SUCCESS;
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+ int i;
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+
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+ *resp = (struct pam_response *) calloc(num, sizeof(struct pam_response));
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+ for(i = 0; i < num; i++)
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+ {
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+ switch (msg[i]->msg_style) {
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+ case PAM_PROMPT_ECHO_ON:
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+ break;
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+ case PAM_PROMPT_ECHO_OFF:
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+ resp[i]->resp = strdup(new_passwd);
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+ break;
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+ case PAM_ERROR_MSG:
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+ case PAM_TEXT_INFO:
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+ break;
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+ default:
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+ break;
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+ }
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+ }
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+ return result;
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+}
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+
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+static int lxdm_change_passwd_pam(const char *service, const char *user, const char *pass)
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+{
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+ pam_handle_t *pamh = NULL;
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+ static struct pam_conv conv = {
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+ do_conv,
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+ NULL
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+ };
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+
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+ int ret = pam_start("lxdm", user, &conv, &pamh);
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+ if (PAM_SUCCESS != ret) {
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+ g_warning("pam_start failed.");
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+ return 1;
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+ }
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+
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+ new_passwd = pass;
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+ ret = pam_chauthtok(pamh, 0);
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+ if (PAM_SUCCESS != ret) {
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+ g_warning("pam_chauthtok failed: %s", pam_strerror(pamh, ret));
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+ return 1;
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+ }
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+
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+ (void)pam_end(pamh, PAM_SUCCESS);
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+
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+ return 0;
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+}
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+#endif
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+
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+int lxdm_change_passwd(const char *user, const char *pass)
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+{
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+#if HAVE_LIBPAM
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+ return lxdm_change_passwd_pam("lxdm", user, pass);
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+#else
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+ return 0;
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+#endif
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+}
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+
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static void close_left_fds(void)
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{
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struct dirent **list;
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@@ -1446,6 +1513,7 @@ int lxdm_do_auto_login(void)
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lxdm_do_login(pw,session,lang,option);
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success=1;
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}
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+
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g_free(user);g_free(session);g_free(lang);
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}
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g_free(last_lang);
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diff --git a/src/lxdm.h b/src/lxdm.h
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index 1c2f837..be3c81f 100644
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--- a/src/lxdm.h
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+++ b/src/lxdm.h
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@@ -30,6 +30,7 @@ G_BEGIN_DECLS
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extern GKeyFile *config;
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int lxdm_auth_user(int type,char *user,char *pass,struct passwd **ppw);
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+int lxdm_change_passwd(const char *user, const char *pass);
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void lxdm_do_login(struct passwd *pw,char *session,char *lang,char *option);
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void lxdm_do_reboot(void);
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void lxdm_do_shutdown(void);
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--
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2.25.1
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