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159 lines
4.0 KiB
159 lines
4.0 KiB
4 years ago
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diff -up ./src/tgetpass.c.bla ./src/tgetpass.c
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--- ./src/tgetpass.c.bla 2018-08-18 16:10:15.000000000 +0200
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+++ ./src/tgetpass.c 2020-02-05 17:15:16.216904891 +0100
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@@ -44,11 +44,18 @@
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#include "sudo.h"
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#include "sudo_plugin.h"
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+enum tgetpass_errval {
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+ TGP_ERRVAL_NOERROR,
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+ TGP_ERRVAL_TIMEOUT,
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+ TGP_ERRVAL_NOPASSWORD,
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+ TGP_ERRVAL_READERROR
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+};
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+
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static volatile sig_atomic_t signo[NSIG];
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static bool tty_present(void);
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static void tgetpass_handler(int);
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-static char *getln(int, char *, size_t, int);
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+static char *getln(int, char *, size_t, int, enum tgetpass_errval *);
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static char *sudo_askpass(const char *, const char *);
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static int
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@@ -77,6 +84,27 @@ suspend(int signo, struct sudo_conv_call
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debug_return_int(ret);
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}
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+static void
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+tgetpass_display_error(enum tgetpass_errval errval)
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+{
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+ debug_decl(tgetpass_display_error, SUDO_DEBUG_CONV)
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+
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+ switch (errval) {
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+ case TGP_ERRVAL_NOERROR:
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+ break;
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+ case TGP_ERRVAL_TIMEOUT:
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+ sudo_warnx(U_("timed out reading password"));
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+ break;
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+ case TGP_ERRVAL_NOPASSWORD:
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+ sudo_warnx(U_("no password was provided"));
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+ break;
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+ case TGP_ERRVAL_READERROR:
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+ sudo_warn(U_("unable to read password"));
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+ break;
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+ }
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+ debug_return;
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+}
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+
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/*
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* Like getpass(3) but with timeout and echo flags.
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*/
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@@ -90,6 +118,7 @@ tgetpass(const char *prompt, int timeout
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static const char *askpass;
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static char buf[SUDO_CONV_REPL_MAX + 1];
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int i, input, output, save_errno, neednl = 0, need_restart;
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+ enum tgetpass_errval errval;
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debug_decl(tgetpass, SUDO_DEBUG_CONV)
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(void) fflush(stdout);
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@@ -175,7 +204,7 @@ restart:
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if (timeout > 0)
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alarm(timeout);
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- pass = getln(input, buf, sizeof(buf), ISSET(flags, TGP_MASK));
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+ pass = getln(input, buf, sizeof(buf), ISSET(flags, TGP_MASK), &errval);
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alarm(0);
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save_errno = errno;
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@@ -183,6 +212,7 @@ restart:
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if (write(output, "\n", 1) == -1)
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goto restore;
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}
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+ tgetpass_display_error(errval);
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restore:
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/* Restore old signal handlers. */
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@@ -210,6 +240,8 @@ restore:
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for (i = 0; i < NSIG; i++) {
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if (signo[i]) {
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switch (i) {
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+ case SIGALRM:
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+ break;
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case SIGTSTP:
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case SIGTTIN:
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case SIGTTOU:
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@@ -239,6 +271,7 @@ sudo_askpass(const char *askpass, const
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{
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static char buf[SUDO_CONV_REPL_MAX + 1], *pass;
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struct sigaction sa, savechld;
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+ enum tgetpass_errval errval;
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int pfd[2], status;
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pid_t child;
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debug_decl(sudo_askpass, SUDO_DEBUG_CONV)
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@@ -281,9 +314,11 @@ sudo_askpass(const char *askpass, const
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/* Get response from child (askpass). */
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(void) close(pfd[1]);
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- pass = getln(pfd[0], buf, sizeof(buf), 0);
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+ pass = getln(pfd[0], buf, sizeof(buf), 0, &errval);
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(void) close(pfd[0]);
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+ tgetpass_display_error(errval);
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+
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/* Wait for child to exit. */
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for (;;) {
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pid_t rv = waitpid(child, &status, 0);
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@@ -305,7 +340,8 @@ sudo_askpass(const char *askpass, const
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extern int sudo_term_erase, sudo_term_kill;
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static char *
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-getln(int fd, char *buf, size_t bufsiz, int feedback)
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+getln(int fd, char *buf, size_t bufsiz, int feedback,
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+ enum tgetpass_errval *errval)
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{
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size_t left = bufsiz;
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ssize_t nr = -1;
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@@ -313,7 +349,10 @@ getln(int fd, char *buf, size_t bufsiz,
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char c = '\0';
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debug_decl(getln, SUDO_DEBUG_CONV)
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+ *errval = TGP_ERRVAL_NOERROR;
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+
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if (left == 0) {
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+ *errval = TGP_ERRVAL_READERROR;
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errno = EINVAL;
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debug_return_str(NULL); /* sanity */
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}
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@@ -354,14 +393,27 @@ getln(int fd, char *buf, size_t bufsiz,
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}
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}
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- debug_return_str_masked(nr == 1 ? buf : NULL);
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+ if (nr != 1) {
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+ if (nr == 0) {
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+ *errval = TGP_ERRVAL_NOPASSWORD;
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+ } else if (nr == -1) {
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+ if (errno == EINTR) {
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+ if (signo[SIGALRM] == 1)
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+ *errval = TGP_ERRVAL_TIMEOUT;
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+ } else {
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+ *errval = TGP_ERRVAL_READERROR;
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+ }
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+ }
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+ debug_return_str(NULL);
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+ }
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+
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+ debug_return_str_masked(buf);
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}
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static void
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tgetpass_handler(int s)
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{
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- if (s != SIGALRM)
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- signo[s] = 1;
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+ signo[s] = 1;
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}
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static bool
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