From ea488580c42e8918445a945484de3c8a5addc761 Mon Sep 17 00:00:00 2001
From: "Andrew G. Morgan" <morgan@kernel.org>
Date: Tue, 20 Jun 2000 22:10:38 +0000
Subject: Initial revision

---
 libpam_misc/help_env.c | 118 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 libpam_misc/help_env.c

(limited to 'libpam_misc/help_env.c')

diff --git a/libpam_misc/help_env.c b/libpam_misc/help_env.c
new file mode 100644
index 00000000..d52b3a02
--- /dev/null
+++ b/libpam_misc/help_env.c
@@ -0,0 +1,118 @@
+/*
+ * $Id$
+ *
+ * This file was written by Andrew G. Morgan <morgan@parc.power.net>
+ *
+ * $Log$
+ * Revision 1.1  2000/06/20 22:11:24  agmorgan
+ * Initial revision
+ *
+ * Revision 1.1.1.1  1998/07/12 05:17:15  morgan
+ * Linux PAM sources pre-0.66
+ *
+ * Revision 1.2  1997/01/04 20:19:20  morgan
+ * added a prototype (no warning) and fixed paste function
+ *
+ * Revision 1.1  1996/12/01 03:25:37  morgan
+ * Initial revision
+ *
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <security/pam_misc.h>
+
+/*
+ * This is a useful function for dumping the Linux-PAM environment
+ * into some local memory, prior to it all getting lost when pam_end()
+ * is called.
+ *
+ * Initially it was assumed that libpam did not do this part correctly
+ * (based on a loose email definition).  The X/Open XSSO spec makes it
+ * clear that this function is a duplicate of the one already in
+ * libpam and therefore unnecessary.  IT WILL BE COMPLETELY REMOVED
+ * IN libpam_misc 1.0 */
+
+char **pam_misc_copy_env(pam_handle_t *pamh);
+char **pam_misc_copy_env(pam_handle_t *pamh)
+{
+    return pam_getenvlist(pamh);
+}
+
+/*
+ * This function should be used to carefully dispose of the copied
+ * environment.
+ *
+ *     usage:     env = pam_misc_drop_env(env);
+ */
+
+char **pam_misc_drop_env(char **dump)
+{
+    int i;
+
+    for (i=0; dump[i] != NULL; ++i) {
+	D(("dump[%d]=`%s'", i, dump[i]));
+	_pam_overwrite(dump[i]);
+	_pam_drop(dump[i]);
+    }
+    _pam_drop(dump);
+
+    return NULL;
+}
+
+/*
+ *  This function takes the supplied environment and uploads it to be
+ *  the PAM one.
+ */
+
+int pam_misc_paste_env(pam_handle_t *pamh, const char * const * user_env)
+{
+    for (; user_env && *user_env; ++user_env) {
+	int retval;
+
+	D(("uploading: %s", *user_env));
+	retval = pam_putenv(pamh, *user_env);
+	if (retval != PAM_SUCCESS) {
+	    D(("error setting %s: %s", *user_env, pam_strerror(pamh,retval)));
+	    return retval;
+	}
+    }
+    D(("done."));
+    return PAM_SUCCESS;
+}
+
+/*
+ * This is a wrapper to make pam behave in the way that setenv() does.
+ */
+
+int pam_misc_setenv(pam_handle_t *pamh, const char *name
+		    , const char *value, int readonly)
+{
+    char *tmp;
+    int retval;
+
+    if (readonly) {
+	const char *etmp;
+
+	/* we check if the variable is there already */
+	etmp = pam_getenv(pamh, name);
+	if (etmp != NULL) {
+	    D(("failed to set readonly variable: %s", name));
+	    return PAM_PERM_DENIED;          /* not allowed to overwrite */
+	}
+    }
+    tmp = malloc(2+strlen(name)+strlen(value));
+    if (tmp != NULL) {
+	sprintf(tmp,"%s=%s",name,value);
+	D(("pam_putt()ing: %s", tmp));
+	retval = pam_putenv(pamh, tmp);
+	_pam_overwrite(tmp);                 /* purge */
+	_pam_drop(tmp);                      /* forget */
+    } else {
+	D(("malloc failure"));
+	retval = PAM_BUF_ERR;
+    }
+
+    return retval;
+}
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