From fcb0a17768142fbd660aae6a24015b67522b015a Mon Sep 17 00:00:00 2001
From: Tom Smeding <tom.smeding@gmail.com>
Date: Mon, 4 Jan 2021 21:07:18 +0100
Subject: utilities: hash_pass: Password hashing utility (doesn't work yet)

It nicely gives a hash, but the server doesn't accept the corresponding
password afterwards. Probably did something stupid.
---
 utilities/.gitignore  |  1 +
 utilities/Makefile    | 20 ++++++++++++++++++
 utilities/hash_pass.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 78 insertions(+)
 create mode 100644 utilities/.gitignore
 create mode 100644 utilities/Makefile
 create mode 100644 utilities/hash_pass.c

diff --git a/utilities/.gitignore b/utilities/.gitignore
new file mode 100644
index 0000000..41ea945
--- /dev/null
+++ b/utilities/.gitignore
@@ -0,0 +1 @@
+hash_pass
diff --git a/utilities/Makefile b/utilities/Makefile
new file mode 100644
index 0000000..684054a
--- /dev/null
+++ b/utilities/Makefile
@@ -0,0 +1,20 @@
+CC = gcc
+CFLAGS = -Wall -Wextra -std=c11 -g -O2 -D_DEFAULT_SOURCE
+LDFLAGS =
+CFLAGS += $(shell pkg-config --cflags libsodium)
+LDFLAGS += $(shell pkg-config --libs libsodium)
+
+SOURCES = $(wildcard *.c)
+TARGETS = $(SOURCES:.c=)
+
+
+.PHONY: all clean
+
+all: $(TARGETS)
+
+clean:
+	rm -f $(TARGETS)
+
+
+$(TARGETS): %: %.c
+	$(CC) $(CFLAGS) -o $@ $< $(LDFLAGS)
diff --git a/utilities/hash_pass.c b/utilities/hash_pass.c
new file mode 100644
index 0000000..fdabbb6
--- /dev/null
+++ b/utilities/hash_pass.c
@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+#include <unistd.h>
+#include <termios.h>
+#include <sodium.h>
+#include "../hashing_settings.h"
+
+
+int main() {
+	bool echo_success = false;
+
+	struct termios tios, tios_orig;
+	int ret = tcgetattr(0, &tios_orig);
+	if (ret == 0) {
+		memcpy(&tios, &tios_orig, sizeof(struct termios));
+		tios.c_lflag &= ~ECHO;
+		ret = tcsetattr(0, TCSANOW, &tios);
+		if (ret == 0) echo_success = true;
+	}
+
+	if (!echo_success && isatty(0)) {
+		fprintf(stderr, "WARNING: Cannot disable ECHO on stdin\n");
+	}
+
+	printf("Password: ");
+	fflush(stdout);
+
+	char *password = NULL;
+	size_t passlen = 0;
+	ssize_t nr = getline(&password, &passlen, stdin);
+	if (nr > 0) {
+		printf("\n");
+
+		if (passlen > 0) password[--passlen] = '\0';
+
+		char result[crypto_pwhash_STRBYTES + 1];
+
+		ret = crypto_pwhash_str(
+				result, password, passlen,
+				PASSHASH_OPSLIMIT, PASSHASH_MEMLIMIT);
+		if (ret == 0) {
+			result[crypto_pwhash_STRBYTES] = '\0';
+
+			printf("Hashed: %s\n", result);
+		}
+
+		sodium_memzero(password, passlen);
+	}
+
+	if (echo_success) {
+		ret = tcsetattr(0, TCSANOW, &tios_orig);
+		if (ret != 0) {
+			fprintf(stderr, "WARNING: Cannot reset original termios on stdin\n");
+		}
+	}
+}
-- 
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