From: Todd C. Miller <Todd.Miller@sudo.ws>
Date: Mon, 22 Jan 2018 19:18:48 +0000 (-0700)
Subject: Store passwd_timeout and timestamp_timeout as a struct timespec
X-Git-Tag: SUDO_1_8_23^2~191
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=4c0c22506242f8d1999d2c8979ad933b1c0d84d6;p=sudo

Store passwd_timeout and timestamp_timeout as a struct timespec
instead of as a float.  Remove timeout argument to auth_getpass()
as it was never used.
---

diff --git a/plugins/sudoers/auth/aix_auth.c b/plugins/sudoers/auth/aix_auth.c
index 88e96dde5..d92483c6a 100644
--- a/plugins/sudoers/auth/aix_auth.c
+++ b/plugins/sudoers/auth/aix_auth.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999-2005, 2007-2016 Todd C. Miller <Todd.Miller@sudo.ws>
+ * Copyright (c) 1999-2005, 2007-2018 Todd C. Miller <Todd.Miller@sudo.ws>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -144,8 +144,7 @@ sudo_aix_verify(struct passwd *pw, char *prompt, sudo_auth *auth, struct sudo_co
     debug_decl(sudo_aix_verify, SUDOERS_DEBUG_AUTH)
 
     do {
-	pass = auth_getpass(prompt, def_passwd_timeout * 60,
-	    SUDO_CONV_PROMPT_ECHO_OFF, callback);
+	pass = auth_getpass(prompt, SUDO_CONV_PROMPT_ECHO_OFF, callback);
 	if (pass == NULL)
 	    break;
 	free(message);
diff --git a/plugins/sudoers/auth/bsdauth.c b/plugins/sudoers/auth/bsdauth.c
index e34b68676..444cd337a 100644
--- a/plugins/sudoers/auth/bsdauth.c
+++ b/plugins/sudoers/auth/bsdauth.c
@@ -121,9 +121,9 @@ bsdauth_verify(struct passwd *pw, char *prompt, sudo_auth *auth, struct sudo_con
      * S/Key.
      */
     if ((s = auth_challenge(as)) == NULL) {
-	pass = auth_getpass(prompt, def_passwd_timeout * 60, SUDO_CONV_PROMPT_ECHO_OFF, callback);
+	pass = auth_getpass(prompt, SUDO_CONV_PROMPT_ECHO_OFF, callback);
     } else {
-	pass = auth_getpass(s, def_passwd_timeout * 60, SUDO_CONV_PROMPT_ECHO_OFF, callback);
+	pass = auth_getpass(s, SUDO_CONV_PROMPT_ECHO_OFF, callback);
 	if (pass && *pass == '\0') {
 	    if ((prompt = strrchr(s, '\n')))
 		prompt++;
@@ -142,8 +142,7 @@ bsdauth_verify(struct passwd *pw, char *prompt, sudo_auth *auth, struct sudo_con
 		debug_return_int(AUTH_FATAL);
 	    }
 	    free(pass);
-	    pass = auth_getpass(s, def_passwd_timeout * 60,
-		SUDO_CONV_PROMPT_ECHO_ON, callback);
+	    pass = auth_getpass(s, SUDO_CONV_PROMPT_ECHO_ON, callback);
 	    free(s);
 	}
     }
diff --git a/plugins/sudoers/auth/fwtk.c b/plugins/sudoers/auth/fwtk.c
index 77d96d243..03d448b0f 100644
--- a/plugins/sudoers/auth/fwtk.c
+++ b/plugins/sudoers/auth/fwtk.c
@@ -91,18 +91,16 @@ restart:
     /* Get the password/response from the user. */
     if (strncmp(resp, "challenge ", 10) == 0) {
 	(void) snprintf(buf, sizeof(buf), "%s\nResponse: ", &resp[10]);
-	pass = auth_getpass(buf, def_passwd_timeout * 60, SUDO_CONV_PROMPT_ECHO_OFF, callback);
+	pass = auth_getpass(buf, SUDO_CONV_PROMPT_ECHO_OFF, callback);
 	if (pass && *pass == '\0') {
 	    free(pass);
 	    pass = auth_getpass("Response [echo on]: ",
-		def_passwd_timeout * 60, SUDO_CONV_PROMPT_ECHO_ON, callback);
+		SUDO_CONV_PROMPT_ECHO_ON, callback);
 	}
     } else if (strncmp(resp, "chalnecho ", 10) == 0) {
-	pass = auth_getpass(&resp[10], def_passwd_timeout * 60,
-	    SUDO_CONV_PROMPT_ECHO_OFF, callback);
+	pass = auth_getpass(&resp[10], SUDO_CONV_PROMPT_ECHO_OFF, callback);
     } else if (strncmp(resp, "password", 8) == 0) {
-	pass = auth_getpass(prompt, def_passwd_timeout * 60,
-	    SUDO_CONV_PROMPT_ECHO_OFF, callback);
+	pass = auth_getpass(prompt, SUDO_CONV_PROMPT_ECHO_OFF, callback);
     } else if (strncmp(resp, "display ", 8) == 0) {
 	sudo_printf(SUDO_CONV_INFO_MSG, "%s\n", &resp[8]);
 	strlcpy(buf, "response dummy", sizeof(buf));
diff --git a/plugins/sudoers/auth/pam.c b/plugins/sudoers/auth/pam.c
index dcd7f2a22..347289da3 100644
--- a/plugins/sudoers/auth/pam.c
+++ b/plugins/sudoers/auth/pam.c
@@ -533,7 +533,7 @@ converse(int num_msg, PAM_CONST struct pam_message **msg,
 		prompt = use_pam_prompt(pm->msg) ? pm->msg : def_prompt;
 
 		/* Read the password unless interrupted. */
-		pass = auth_getpass(prompt, def_passwd_timeout * 60, type, callback);
+		pass = auth_getpass(prompt, type, callback);
 		if (pass == NULL) {
 		    /* Error (or ^C) reading password, don't try again. */
 		    getpass_error = true;
diff --git a/plugins/sudoers/auth/securid5.c b/plugins/sudoers/auth/securid5.c
index b3bfd24d8..fd6fe6c4f 100644
--- a/plugins/sudoers/auth/securid5.c
+++ b/plugins/sudoers/auth/securid5.c
@@ -145,8 +145,8 @@ sudo_securid_verify(struct passwd *pw, char *pass, sudo_auth *auth, struct sudo_
     int ret;
     debug_decl(sudo_securid_verify, SUDOERS_DEBUG_AUTH)
 
-    pass = auth_getpass("Enter your PASSCODE: ",
-	def_passwd_timeout * 60, SUDO_CONV_PROMPT_ECHO_OFF, callback);
+    pass = auth_getpass("Enter your PASSCODE: ", SUDO_CONV_PROMPT_ECHO_OFF,
+	callback);
 
     /* Have ACE verify password */
     switch (SD_Check(*sd, pass, pw->pw_name)) {
@@ -185,7 +185,7 @@ sudo_securid_verify(struct passwd *pw, char *pass, sudo_auth *auth, struct sudo_
 !!! ATTENTION !!!\n\
 Wait for the token code to change, \n\
 then enter the new token code.\n", \
-		def_passwd_timeout * 60, SUDO_CONV_PROMPT_ECHO_OFF, callback);
+		SUDO_CONV_PROMPT_ECHO_OFF, callback);
 
 		if (SD_Next(*sd, pass) == ACM_OK) {
 			ret = AUTH_SUCCESS;
diff --git a/plugins/sudoers/auth/sia.c b/plugins/sudoers/auth/sia.c
index a59459ca7..ab18139b5 100644
--- a/plugins/sudoers/auth/sia.c
+++ b/plugins/sudoers/auth/sia.c
@@ -84,8 +84,7 @@ sudo_sia_verify(struct passwd *pw, char *prompt, sudo_auth *auth,
     debug_decl(sudo_sia_verify, SUDOERS_DEBUG_AUTH)
 
     /* Get password, return AUTH_INTR if we got ^C */
-    pass = auth_getpass(prompt, def_passwd_timeout * 60,
-        SUDO_CONV_PROMPT_ECHO_OFF, callback);
+    pass = auth_getpass(prompt, SUDO_CONV_PROMPT_ECHO_OFF, callback);
     if (pass == NULL)
 	debug_return_int(AUTH_INTR);
 
diff --git a/plugins/sudoers/auth/sudo_auth.c b/plugins/sudoers/auth/sudo_auth.c
index 76569ee91..6ef9bd726 100644
--- a/plugins/sudoers/auth/sudo_auth.c
+++ b/plugins/sudoers/auth/sudo_auth.c
@@ -304,8 +304,7 @@ verify_user(struct passwd *pw, char *prompt, int validated,
 
 	/* Get the password unless the auth function will do it for us */
 	if (!standalone) {
-	    pass = auth_getpass(prompt, def_passwd_timeout * 60,
-		SUDO_CONV_PROMPT_ECHO_OFF, callback);
+	    pass = auth_getpass(prompt, SUDO_CONV_PROMPT_ECHO_OFF, callback);
 	    if (pass == NULL)
 		break;
 	}
@@ -422,8 +421,7 @@ sudo_auth_end_session(struct passwd *pw)
  * The user is responsible for freeing the returned value.
  */
 char *
-auth_getpass(const char *prompt, int timeout, int type,
-    struct sudo_conv_callback *callback)
+auth_getpass(const char *prompt, int type, struct sudo_conv_callback *callback)
 {
     struct sudo_conv_message msg;
     struct sudo_conv_reply repl;
@@ -448,7 +446,7 @@ auth_getpass(const char *prompt, int timeout, int type,
     /* Call conversation function. */
     memset(&msg, 0, sizeof(msg));
     msg.msg_type = type;
-    msg.timeout = def_passwd_timeout * 60;
+    msg.timeout = def_passwd_timeout.tv_sec;
     msg.msg = prompt;
     memset(&repl, 0, sizeof(repl));
     sudo_conv(1, &msg, &repl, callback);
diff --git a/plugins/sudoers/auth/sudo_auth.h b/plugins/sudoers/auth/sudo_auth.h
index 6e3128071..ea5ed9cd7 100644
--- a/plugins/sudoers/auth/sudo_auth.h
+++ b/plugins/sudoers/auth/sudo_auth.h
@@ -48,8 +48,7 @@ typedef struct sudo_auth {
 #define IS_ONEANDONLY(x)	((x)->flags & FLAG_ONEANDONLY)
 
 /* Like tgetpass() but uses conversation function */
-char *auth_getpass(const char *prompt, int timeout, int type,
-    struct sudo_conv_callback *callback);
+char *auth_getpass(const char *prompt, int type, struct sudo_conv_callback *callback);
 
 /* Pointer to conversation function to use with auth_getpass(). */
 extern sudo_conv_t sudo_conv;
diff --git a/plugins/sudoers/def_data.c b/plugins/sudoers/def_data.c
index cc334b460..73f18d8b2 100644
--- a/plugins/sudoers/def_data.c
+++ b/plugins/sudoers/def_data.c
@@ -174,11 +174,11 @@ struct sudo_defs_types sudo_defs_table[] = {
 	N_("Length at which to wrap log file lines (0 for no wrap): %u"),
 	NULL,
     }, {
-	"timestamp_timeout", T_FLOAT|T_BOOL,
+	"timestamp_timeout", T_TIMESPEC|T_BOOL,
 	N_("Authentication timestamp timeout: %.1f minutes"),
 	NULL,
     }, {
-	"passwd_timeout", T_FLOAT|T_BOOL,
+	"passwd_timeout", T_TIMESPEC|T_BOOL,
 	N_("Password prompt timeout: %.1f minutes"),
 	NULL,
     }, {
diff --git a/plugins/sudoers/def_data.h b/plugins/sudoers/def_data.h
index 7239690d2..67dc145da 100644
--- a/plugins/sudoers/def_data.h
+++ b/plugins/sudoers/def_data.h
@@ -67,9 +67,9 @@
 #define I_LOGLINELEN            33
 #define def_loglinelen          (sudo_defs_table[I_LOGLINELEN].sd_un.uival)
 #define I_TIMESTAMP_TIMEOUT     34
-#define def_timestamp_timeout   (sudo_defs_table[I_TIMESTAMP_TIMEOUT].sd_un.fval)
+#define def_timestamp_timeout   (sudo_defs_table[I_TIMESTAMP_TIMEOUT].sd_un.tspec)
 #define I_PASSWD_TIMEOUT        35
-#define def_passwd_timeout      (sudo_defs_table[I_PASSWD_TIMEOUT].sd_un.fval)
+#define def_passwd_timeout      (sudo_defs_table[I_PASSWD_TIMEOUT].sd_un.tspec)
 #define I_PASSWD_TRIES          36
 #define def_passwd_tries        (sudo_defs_table[I_PASSWD_TRIES].sd_un.uival)
 #define I_UMASK                 37
diff --git a/plugins/sudoers/def_data.in b/plugins/sudoers/def_data.in
index 944454533..5bb8d31ee 100644
--- a/plugins/sudoers/def_data.in
+++ b/plugins/sudoers/def_data.in
@@ -114,10 +114,10 @@ loglinelen
 	T_UINT|T_BOOL
 	"Length at which to wrap log file lines (0 for no wrap): %u"
 timestamp_timeout
-	T_FLOAT|T_BOOL
+	T_TIMESPEC|T_BOOL
 	"Authentication timestamp timeout: %.1f minutes"
 passwd_timeout
-	T_FLOAT|T_BOOL
+	T_TIMESPEC|T_BOOL
 	"Password prompt timeout: %.1f minutes"
 passwd_tries
 	T_UINT
diff --git a/plugins/sudoers/defaults.c b/plugins/sudoers/defaults.c
index 77687a523..ce7d6a83d 100644
--- a/plugins/sudoers/defaults.c
+++ b/plugins/sudoers/defaults.c
@@ -105,7 +105,7 @@ static bool store_syslogpri(const char *str, union sudo_defs_val *sd_un);
 static bool store_timeout(const char *str, union sudo_defs_val *sd_un);
 static bool store_tuple(const char *str, union sudo_defs_val *sd_un, struct def_values *tuple_vals);
 static bool store_uint(const char *str, union sudo_defs_val *sd_un);
-static bool store_float(const char *str, union sudo_defs_val *sd_un);
+static bool store_timespec(const char *str, union sudo_defs_val *sd_un);
 static bool list_op(const char *str, size_t, union sudo_defs_val *sd_un, enum list_ops op);
 static const char *logfac2str(int);
 static const char *logpri2str(int);
@@ -163,10 +163,14 @@ dump_defaults(void)
 		    sudo_printf(SUDO_CONV_INFO_MSG, desc, cur->sd_un.uival);
 		    sudo_printf(SUDO_CONV_INFO_MSG, "\n");
 		    break;
-		case T_FLOAT:
-		    sudo_printf(SUDO_CONV_INFO_MSG, desc, cur->sd_un.fval);
+		case T_TIMESPEC: {
+		    /* display time spec in minutes as a double */
+		    double d = cur->sd_un.tspec.tv_sec / 60.0;
+		    d += cur->sd_un.tspec.tv_nsec / 1000000000.0;
+		    sudo_printf(SUDO_CONV_INFO_MSG, desc, d);
 		    sudo_printf(SUDO_CONV_INFO_MSG, "\n");
 		    break;
+		}
 		case T_MODE:
 		    sudo_printf(SUDO_CONV_INFO_MSG, desc, cur->sd_un.mode);
 		    sudo_printf(SUDO_CONV_INFO_MSG, "\n");
@@ -305,9 +309,6 @@ parse_default_entry(struct sudo_defs_types *def, const char *val, int op,
 	case T_UINT:
 	    rc = store_uint(val, sd_un);
 	    break;
-	case T_FLOAT:
-	    rc = store_float(val, sd_un);
-	    break;
 	case T_MODE:
 	    rc = store_mode(val, sd_un);
 	    break;
@@ -337,6 +338,9 @@ parse_default_entry(struct sudo_defs_types *def, const char *val, int op,
 	case T_TUPLE:
 	    rc = store_tuple(val, sd_un, def->values);
 	    break;
+	case T_TIMESPEC:
+	    rc = store_timespec(val, sd_un);
+	    break;
 	default:
 	    if (!quiet) {
 		if (lineno > 0) {
@@ -585,8 +589,8 @@ init_defaults(void)
     def_umask = ACCESSPERMS;
 #endif
     def_loglinelen = MAXLOGFILELEN;
-    def_timestamp_timeout = TIMEOUT;
-    def_passwd_timeout = PASSWORD_TIMEOUT;
+    def_timestamp_timeout.tv_sec = TIMEOUT * 60;
+    def_passwd_timeout.tv_sec = PASSWORD_TIMEOUT * 60;
     def_passwd_tries = TRIES_FOR_PASSWORD;
 #ifdef HAVE_ZLIB_H
     def_compress_io = true;
@@ -848,20 +852,25 @@ store_uint(const char *str, union sudo_defs_val *sd_un)
 }
 
 static bool
-store_float(const char *str, union sudo_defs_val *sd_un)
+store_timespec(const char *str, union sudo_defs_val *sd_un)
 {
     char *endp;
     double d;
-    debug_decl(store_float, SUDOERS_DEBUG_DEFAULTS)
+    debug_decl(store_timespec, SUDOERS_DEBUG_DEFAULTS)
 
     if (str == NULL) {
-	sd_un->fval = 0.0;
+	sd_un->tspec.tv_sec = 0;
+	sd_un->tspec.tv_nsec = 0;
     } else {
 	d = strtod(str, &endp);
 	if (*endp != '\0')
 	    debug_return_bool(false);
 	/* XXX - should check against HUGE_VAL */
-	sd_un->fval = d;
+
+	/* Convert from minutes to seconds and nanoseconds. */
+	d *= 60.0;
+	sd_un->tspec.tv_sec = (time_t)d;
+	sd_un->tspec.tv_nsec = (long)(d - sd_un->tspec.tv_sec) * 1000000000L;
     }
     debug_return_bool(true);
 }
diff --git a/plugins/sudoers/defaults.h b/plugins/sudoers/defaults.h
index ea4da1c5e..c0016e294 100644
--- a/plugins/sudoers/defaults.h
+++ b/plugins/sudoers/defaults.h
@@ -22,6 +22,7 @@
 #ifndef SUDOERS_DEFAULTS_H
 #define SUDOERS_DEFAULTS_H
 
+#include <time.h>
 #include <def_data.h>
 
 struct list_member {
@@ -47,10 +48,10 @@ union sudo_defs_val {
     int flag;
     int ival;
     unsigned int uival;
-    double fval;
     enum def_tuple tuple;
     char *str;
     mode_t mode;
+    struct timespec tspec;
     struct list_members list;
 };
 
@@ -76,7 +77,7 @@ struct early_default {
 
 /*
  * Four types of defaults: strings, integers, and flags.
- * Also, T_INT, T_FLOAT or T_STR may be ANDed with T_BOOL to indicate that
+ * Also, T_INT, T_TIMESPEC or T_STR may be ANDed with T_BOOL to indicate that
  * a value is not required.  Flags are boolean by nature...
  */
 #undef T_INT
@@ -97,8 +98,8 @@ struct early_default {
 #define T_LOGPRI	0x008
 #undef T_TUPLE
 #define T_TUPLE		0x009
-#undef T_FLOAT
-#define T_FLOAT		0x010
+#undef T_TIMESPEC
+#define T_TIMESPEC	0x010
 #undef T_TIMEOUT
 #define T_TIMEOUT	0x020
 #undef T_MASK
diff --git a/plugins/sudoers/mkdefaults b/plugins/sudoers/mkdefaults
index 6943ec4b4..885c1b581 100755
--- a/plugins/sudoers/mkdefaults
+++ b/plugins/sudoers/mkdefaults
@@ -137,16 +137,16 @@ sub print_record {
     $defname = "I_" . uc($rec->[0]);
     printf HEADER "#define %-23s %d\n", $defname, $recnum;
     for ($rec->[1]) {
-	if    (/^T_INT/)    { $v = "ival"; }
-	elsif (/^T_UINT/)   { $v = "uival"; }
-	elsif (/^T_STR/)    { $v = "str"; }
-	elsif (/^T_FLAG/)   { $v = "flag"; }
-	elsif (/^T_MODE/)   { $v = "mode"; }
-	elsif (/^T_LIST/)   { $v = "list"; }
-	elsif (/^T_LOGFAC/) { $v = "ival"; }
-	elsif (/^T_LOGPRI/) { $v = "ival"; }
-	elsif (/^T_TUPLE/)  { $v = "tuple"; }
-	elsif (/^T_FLOAT/)  { $v = "fval"; }
+	if    (/^T_INT/)      { $v = "ival"; }
+	elsif (/^T_UINT/)     { $v = "uival"; }
+	elsif (/^T_STR/)      { $v = "str"; }
+	elsif (/^T_FLAG/)     { $v = "flag"; }
+	elsif (/^T_MODE/)     { $v = "mode"; }
+	elsif (/^T_LIST/)     { $v = "list"; }
+	elsif (/^T_LOGFAC/)   { $v = "ival"; }
+	elsif (/^T_LOGPRI/)   { $v = "ival"; }
+	elsif (/^T_TUPLE/)    { $v = "tuple"; }
+	elsif (/^T_TIMESPEC/) { $v = "tspec"; }
 	elsif (/^T_TIMEOUT/)  { $v = "ival"; }
 	else { die "$0: unknown defaults type: $_\n"; }
     }
diff --git a/plugins/sudoers/timestamp.c b/plugins/sudoers/timestamp.c
index d4e65c96e..9e2c4179a 100644
--- a/plugins/sudoers/timestamp.c
+++ b/plugins/sudoers/timestamp.c
@@ -381,7 +381,7 @@ timestamp_open(const char *user, pid_t sid)
     debug_decl(timestamp_open, SUDOERS_DEBUG_AUTH)
 
     /* Zero timeout means don't use the time stamp file. */
-    if (def_timestamp_timeout == 0.0) {
+    if (!sudo_timespecisset(&def_timestamp_timeout)) {
 	errno = ENOENT;
 	goto bad;
     }
@@ -720,13 +720,13 @@ timestamp_status(void *vcookie, struct passwd *pw)
 {
     struct ts_cookie *cookie = vcookie;
     struct timestamp_entry entry;
-    struct timespec diff, now, timeout;
+    struct timespec diff, now;
     int status = TS_ERROR;		/* assume the worst */
     ssize_t nread;
     debug_decl(timestamp_status, SUDOERS_DEBUG_AUTH)
 
     /* Zero timeout means don't use time stamp files. */
-    if (def_timestamp_timeout == 0.0) {
+    if (!sudo_timespecisset(&def_timestamp_timeout)) {
 	sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
 	    "timestamps disabled");
 	status = TS_OLD;
@@ -781,7 +781,8 @@ timestamp_status(void *vcookie, struct passwd *pw)
     }
 
     /* Negative timeouts only expire manually (sudo -k).  */
-    if (def_timestamp_timeout < 0) {
+    sudo_timespecclear(&diff);
+    if (sudo_timespeccmp(&def_timestamp_timeout, &diff, <)) {
 	sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
 	    "time stamp record does not expire");
 	status = TS_CURRENT;
@@ -795,12 +796,9 @@ timestamp_status(void *vcookie, struct passwd *pw)
 	goto done;
     }
     sudo_timespecsub(&now, &entry.ts, &diff);
-    timeout.tv_sec = 60 * def_timestamp_timeout;
-    timeout.tv_nsec = ((60.0 * def_timestamp_timeout) - (double)timeout.tv_sec)
-	* 1000000000.0;
-    if (sudo_timespeccmp(&diff, &timeout, <)) {
+    if (sudo_timespeccmp(&diff, &def_timestamp_timeout, <)) {
 	status = TS_CURRENT;
-#ifdef CLOCK_MONOTONIC
+#if defined(CLOCK_MONOTONIC) || defined(__MACH__)
 	/* A monotonic clock should never run backwards. */
 	if (diff.tv_sec < 0) {
 	    log_warningx(SLOG_SEND_MAIL,
@@ -810,10 +808,21 @@ timestamp_status(void *vcookie, struct passwd *pw)
 	    (void)ts_write(cookie->fd, cookie->fname, &entry, cookie->pos);
 	}
 #else
-	/* Check for bogus (future) time in the stampfile. */
+	/*
+	 * Check for bogus (future) time in the stampfile.
+	 * If diff / 2 > timeout, someone has been fooling with the clock.
+	 */
 	sudo_timespecsub(&entry.ts, &now, &diff);
-	timeout.tv_sec *= 2;
-	if (sudo_timespeccmp(&diff, &timeout, >)) {
+	diff.tv_nsec /= 2;
+	if (diff.tv_sec & 1)
+	    diff.tv_nsec += 500000000;
+	diff.tv_sec /= 2;
+	while (diff.tv_nsec >= 1000000000) {
+	    diff.tv_sec++;
+	    diff.tv_nsec -= 1000000000;
+	}
+
+	if (sudo_timespeccmp(&diff, &def_timestamp_timeout, >)) {
 	    time_t tv_sec = (time_t)entry.ts.tv_sec;
 	    log_warningx(SLOG_SEND_MAIL,
 		N_("time stamp too far in the future: %20.20s"),
@@ -843,7 +852,7 @@ timestamp_update(void *vcookie, struct passwd *pw)
     debug_decl(timestamp_update, SUDOERS_DEBUG_AUTH)
 
     /* Zero timeout means don't use time stamp files. */
-    if (def_timestamp_timeout == 0.0) {
+    if (!sudo_timespecisset(&def_timestamp_timeout)) {
 	sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
 	    "timestamps disabled");
 	goto done;
@@ -858,7 +867,7 @@ timestamp_update(void *vcookie, struct passwd *pw)
 #ifdef TIOCSETVERAUTH
 	int fd = open(_PATH_TTY, O_RDWR);
 	if (fd != -1) {
-	    int secs = 60 * def_timestamp_timeout;
+	    int secs = def_timestamp_timeout.tv_sec;
 	    ioctl(fd, TIOCSETVERAUTH, &secs);
 	    close(fd);
 	}