2017-08-10 18:19:50 +00:00
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From a40c584691ae071e93e8adf4e5c05bcd90c68159 Mon Sep 17 00:00:00 2001
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From: Julien Cristau <jcristau@debian.org>
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Date: Sat, 6 May 2017 22:45:34 +0200
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2017-08-15 15:14:22 +00:00
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Subject: [PATCH 21/29] Fix race condition in SEC_GetPassword
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2017-08-10 18:19:50 +00:00
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A side effect of echoOff is to discard unread input, so if we print the
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prompt before echoOff, the user (or process) at the other end might
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react to it by writing the password in between those steps, which is
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then discarded. This bit me when trying to drive pesign with an expect
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script.
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Signed-off-by: Julien Cristau <jcristau@debian.org>
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---
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src/password.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/password.c b/src/password.c
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index cd1c07e..d4eae0d 100644
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--- a/src/password.c
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+++ b/src/password.c
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@@ -71,9 +71,9 @@ static char *SEC_GetPassword(FILE *input, FILE *output, char *prompt,
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for (;;) {
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/* Prompt for password */
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if (isTTY) {
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+ echoOff(infd);
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fprintf(output, "%s", prompt);
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fflush (output);
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- echoOff(infd);
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}
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fgets ( phrase, sizeof(phrase), input);
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--
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2.13.4
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