X-Git-Url: http://www.average.org/gitweb/?p=pam_pcsc_cr.git;a=blobdiff_plain;f=pam_pcsc_cr.c;h=5d17365b8ad2ea95f5a160566df3017a2f57d9b7;hp=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391;hb=b4bd8dfd5d7780bc00f820c3dec7b2a06f47b514;hpb=6fe5a6db779c104d4aa103c2f30a5c5cab98afb7

diff --git a/pam_pcsc_cr.c b/pam_pcsc_cr.c
index e69de29..5d17365 100644
--- a/pam_pcsc_cr.c
+++ b/pam_pcsc_cr.c
@@ -0,0 +1,257 @@
+/*
+Copyright (c) 2013 Eugene Crosser
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must
+    not claim that you wrote the original software. If you use this
+    software in a product, an acknowledgment in the product documentation
+    would be appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must
+    not be misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution.
+*/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <syslog.h>
+#include "authobj.h"
+#include "authfile.h"
+#include "pcsc_cr.h"
+
+#ifndef PIC
+# define PAM_STATIC
+#endif
+
+#define PAM_SM_AUTH
+
+#ifdef HAVE_SECURITY_PAM_APPL_H
+# include <security/pam_appl.h>
+#endif
+#ifdef HAVE_SECURITY_PAM_MODULES_H
+# include <security/pam_modules.h>
+#endif
+#ifdef HAVE_SECURITY_PAM_EXT_H
+# include <security/pam_ext.h>
+#endif
+
+#ifndef PAM_EXTERN
+# ifdef PAM_STATIC
+#  define PAM_EXTERN static
+# else
+#  define PAM_EXTERN extern
+# endif
+#endif
+
+struct _cfg {
+	int noaskpass;
+	int verbose;
+	int injectauth;
+};
+
+#ifndef HAVE_PAM_GET_AUTHTOK
+static int pam_get_authtok(pam_handle_t *pamh, int item, const char **authtok,
+			const char *prompt)
+{
+	struct _cfg dfl_cfg = {0};
+	struct _cfg *cfg = &dfl_cfg;
+	struct pam_conv *conv;
+	struct pam_message msg;
+	const struct pam_message *msgp;
+	struct pam_response *resp;
+	int pam_err;
+
+	(void)pam_get_data(pamh, "pcsc_cr_cfg_struct", (const void **)&cfg);
+
+	if ((pam_err = pam_get_item(pamh, PAM_AUTHTOK,
+					(const void **)authtok))) {
+		if (cfg->verbose) syslog(LOG_ERR,
+					"get_item(PAM_AUTHTOK) failed: %s",
+					pam_strerror(pamh, pam_err));
+	} else {
+		if (*authtok) return PAM_SUCCESS;
+	}
+
+	if ((pam_err = pam_get_item(pamh, PAM_CONV,
+				(const void **)&conv))) {
+		if (cfg->verbose) syslog(LOG_ERR,
+				"get_item(PAM_CONV) failed: %s",
+				pam_strerror(pamh, pam_err));
+		return pam_err;
+	}
+	msg.msg_style = PAM_PROMPT_ECHO_OFF;
+	msg.msg = prompt;
+	msgp = &msg;
+	resp = NULL;
+	pam_err =  (*conv->conv)(1, &msgp, &resp, conv->appdata_ptr);
+	if (resp != NULL) {
+		if (pam_err == PAM_SUCCESS) *authtok = resp->resp;
+		else free(resp->resp);
+		free(resp);
+	}
+	return pam_err;
+}
+#endif
+
+static struct _auth_chunk
+token_key(const unsigned char *challenge, const int challengesize)
+{
+	struct _auth_chunk ho = {0};
+	long rc;
+	int keysize = sizeof(ho.data);
+
+	if ((rc = pcsc_cr(challenge, challengesize, ho.data, &keysize))) {
+		ho.err = pcsc_errstr(rc);
+	}
+	return ho;
+}
+
+static void update_nonce(char *nonce, const int nonsize)
+{
+	int n = 0;
+
+	sscanf(nonce, "%d", &n);
+	snprintf(nonce, nonsize, "%d", n+1);
+}
+
+void parse_cfg(struct _cfg * const cfg, int argc, const char *argv[])
+{
+	int i;
+
+	for (i = 0; i < argc; i++) {
+		if (strchr(argv[i],':') && strchr(argv[i],'=')) {
+			if (pcsc_option(argv[i]))
+				syslog(LOG_ERR,
+				"unrecognized pcsc backedn option \"%s\"",
+						argv[i]);
+		} else if (!strcmp(argv[i], "verbose")) cfg->verbose = 1;
+		else if (!strcmp(argv[i], "noaskpass")) cfg->noaskpass = 1;
+		else if (!strcmp(argv[i], "injectauth")) cfg->injectauth = 1;
+		else if (!strncmp(argv[i], "path=", 5))
+					authfile_template(argv[i]+5);
+		else syslog(LOG_ERR, "unrecognized arg: \"%s\"", argv[i]);
+
+		if (cfg->verbose) syslog(LOG_DEBUG, "arg: \"%s\"", argv[i]);
+	}
+}
+
+PAM_EXTERN int
+pam_sm_authenticate(pam_handle_t *pamh, int flags,
+	int argc, const char *argv[])
+{
+	struct _cfg cfg = {0};
+	const char *tokenid = NULL;
+	const char *user;
+	const char *password;
+	struct _auth_obj ao;
+	int pam_err;
+
+	parse_cfg(&cfg, argc, argv);
+	(void)pam_set_data(pamh, "pcsc_cr_cfg_struct", &cfg, NULL);
+
+	if ((pam_err = pam_get_user(pamh, &user, NULL)) != PAM_SUCCESS) {
+		if (cfg.verbose) syslog(LOG_ERR, "get_user failed: %s",
+					pam_strerror(pamh, pam_err));
+		return pam_err;
+	}
+	if (strspn(user, "0123456789") == strlen(user)) {
+		tokenid = user;
+		user = NULL;
+	}
+	if (cfg.verbose) syslog(LOG_DEBUG, "tokenid=\"%s\", user=\"%s\"",
+				tokenid?tokenid:"<none>", user?user:"<none>");
+
+	if (!cfg.noaskpass) {
+		if ((pam_err = pam_get_authtok(pamh, PAM_AUTHTOK,
+					(const char **)&password,
+					"Token password:"))) {
+			if (cfg.verbose) syslog(LOG_ERR,
+						"get_authtok failed: %s",
+						pam_strerror(pamh, pam_err));
+			return pam_err;
+		}
+	} else {
+		password = "";
+	}
+
+	ao = authfile(tokenid, user, password, update_nonce,
+			NULL, 0, NULL, 0, token_key);
+	if (ao.err) {
+		if (cfg.verbose) syslog(LOG_INFO, "authfile: %s", ao.err);
+		return PAM_AUTH_ERR;
+	} else {
+		if (!user)
+			pam_set_item(pamh, PAM_USER, ao.data);
+		if (cfg.injectauth && ao.payload && ao.payload[0])
+			pam_set_item(pamh, PAM_AUTHTOK, ao.payload);
+		if (cfg.verbose) syslog(LOG_DEBUG, "authenticated");
+		return PAM_SUCCESS;
+	}
+}
+
+PAM_EXTERN int
+pam_sm_setcred(pam_handle_t *pamh, int flags,
+	int argc, const char *argv[])
+{
+	return PAM_SUCCESS;
+}
+
+PAM_EXTERN int
+pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
+	int argc, const char *argv[])
+{
+	return PAM_SUCCESS;
+}
+
+PAM_EXTERN int
+pam_sm_open_session(pam_handle_t *pamh, int flags,
+	int argc, const char *argv[])
+{
+	return PAM_SUCCESS;
+}
+
+PAM_EXTERN int
+pam_sm_close_session(pam_handle_t *pamh, int flags,
+	int argc, const char *argv[])
+{
+	return PAM_SUCCESS;
+}
+
+PAM_EXTERN int
+pam_sm_chauthtok(pam_handle_t *pamh, int flags,
+	int argc, const char *argv[])
+{
+	return PAM_SERVICE_ERR;
+}
+
+#ifdef PAM_MODULE_ENTRY
+PAM_MODULE_ENTRY("pam_pcsc_cr");
+#endif
+
+#ifdef PAM_STATIC
+struct pam_module _pam_pcsc_cr_modstruct = {
+	"pam_pcsc_cr",
+	pam_sm_authenticate,
+	pam_sm_setcred,
+	pam_sm_acct_mgmt,
+	pam_sm_open_session,
+	pam_sm_close_session,
+	pam_sm_chauthtok
+};
+#endif