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client: Enhance secret masking

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Due to the changed IO behavior, pasting of the secrets
into the agent prompt became impossible. The reimplemented
logic allows to add (paste) an arbitrary number of characters
into a desired position of a secret string up to its max lengths.
The deletion has also been reworked to accommodate the new behavior.
This commit is contained in:
Tim Kourt 2019-08-27 08:58:16 -07:00 committed by Denis Kenzior
parent 44fcb2b1d7
commit ebad9bf9be
1 changed files with 41 additions and 25 deletions
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66
client/display.c
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@ -397,48 +397,64 @@ static void display_completion_matches(char **matches, int num_matches,
static struct masked_input {
bool use_mask;
char passphrase[MAX_PASSPHRASE_LEN];
char mask[MAX_PASSPHRASE_LEN];
uint8_t point;
uint8_t end;
} masked_input;
static void mask_input(void)
{
int point;
char *line;
size_t len;
if (!masked_input.use_mask)
return;
line = rl_copy_text(0, rl_end);
len = strlen(line);
if (!len)
goto done;
point = rl_point;
if (len > MAX_PASSPHRASE_LEN) {
point--;
} else if (strlen(masked_input.passphrase) > len) {
masked_input.passphrase[len] = 0;
masked_input.mask[len] = 0;
} else {
masked_input.passphrase[len - 1] = line[len - 1];
masked_input.mask[len - 1] = '*';
if (rl_end > MAX_PASSPHRASE_LEN) {
rl_point = rl_end = MAX_PASSPHRASE_LEN;
goto set_mask;
}
rl_replace_line(masked_input.mask, 0);
rl_point = point;
if (masked_input.end == rl_end) {
/* Moving cursor. */
goto done;
} else if (masked_input.end < rl_end) {
/* Insertion. */
memcpy(masked_input.passphrase + rl_point,
masked_input.passphrase + masked_input.point,
masked_input.end - masked_input.point);
memcpy(masked_input.passphrase + masked_input.point,
rl_line_buffer + masked_input.point,
rl_point - masked_input.point);
} else {
/* Deletion. */
if (masked_input.point > rl_point)
/* Backspace key. */
memcpy(masked_input.passphrase + rl_point,
masked_input.passphrase + masked_input.point,
masked_input.end - masked_input.point);
else
/* Delete key. */
memcpy(masked_input.passphrase + rl_point,
masked_input.passphrase + masked_input.point
+ 1,
rl_end - rl_point);
memset(masked_input.passphrase + rl_end, 0,
masked_input.end - rl_end);
}
set_mask:
memset(rl_line_buffer, '*', rl_end);
rl_line_buffer[rl_end] = '\0';
rl_redisplay();
masked_input.end = rl_end;
done:
l_free(line);
masked_input.point = rl_point;
}
static void reset_masked_input(void)
{
memset(masked_input.passphrase, 0, MAX_PASSPHRASE_LEN);
memset(masked_input.mask, 0, MAX_PASSPHRASE_LEN);
masked_input.point = 0;
masked_input.end = 0;
}
static void readline_callback(char *prompt)