pam_pwhistory: load config from file

* modules/pam_pwhistory/pam_pwhistory.c: Load config from file and
provide new conf option to select the file.
* modules/pam_pwhistory/pwhistory_config.c: Parse config from file and
load to options structure.
* modules/pam_pwhistory/pwhistory_config.h: Move options_t structure and
define parse_config_file().
* modules/pam_pwhistory/Makefile.am (noinst_HEADERS): Add pwhistory_config.h.
(pam_pwhistory_la_SOURCES): Add pwhistory_config.c.
(dist_secureconf_DATA): Add pwhistory.conf.
* modules/pam_pwhistory/pwhistory.conf: New configuration file.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2068461

Signed-off-by: Iker Pedrosa <ipedrosa@redhat.com>

1 files changed, 54 insertions, 0 deletions

diff --git a/modules/pam_pwhistory/pwhistory_config.h b/modules/pam_pwhistory/pwhistory_config.h
new file mode 100644
index 00000000..e2b3bc83
--- /dev/null
+++ b/modules/pam_pwhistory/pwhistory_config.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2022 Iker Pedrosa <ipedrosa@redhat.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _PWHISTORY_CONFIG_H
+#define _PWHISTORY_CONFIG_H
+
+#include <security/pam_ext.h>
+
+struct options_t {
+    int debug;
+    int enforce_for_root;
+    int remember;
+    int tries;
+    const char *filename;
+};
+typedef struct options_t options_t;
+
+void
+parse_config_file(pam_handle_t *pamh, int argc, const char **argv,
+                  struct options_t *options);
+
+#endif /* _PWHISTORY_CONFIG_H */