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Add a TermWin method to draw a 'trust sigil'.

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This is not yet used by anything, but the idea is that it'll be a
graphic in the terminal window that can't be replicated by a server
sending escape sequences, and hence can be used as a reliable
indication that the text on a particular terminal line is generated by
PuTTY itself and not passed through from the server. This will make it
possible to detect a malicious server trying to mimic local prompts to
trick you out of information that shouldn't be sent over the wire
(such as private-key passphrases).

The trust sigil I've picked is a small copy of the PuTTY icon, which
is thematically nice (it can be read as if the PuTTY icon is the name
of the speaker in a dialogue) and also convenient because we had that
graphic available already on all platforms. (Though the contortions I
had to go through to make the GTK 1 code draw it were quite annoying.)

The trust sigil has the same dimensions as a CJK double-width
character, i.e. it's 2 character cells wide by 1 high.
This commit is contained in:
Simon Tatham
2019-03-10 14:37:11 +00:00
parent e21afff605
commit 2a5d8e05e8
4 changed files with 188 additions and 1 deletions
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5
fuzzterm.c
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@ -69,6 +69,10 @@ static void fuzz_draw_cursor(
}
printf("\n");
}
static void fuzz_draw_trust_sigil(TermWin *tw, int x, int y)
{
printf("TRUST@(%d,%d)\n", x, y);
}
static int fuzz_char_width(TermWin *tw, int uc) { return 1; }
static void fuzz_free_draw_ctx(TermWin *tw) {}
static void fuzz_set_cursor_pos(TermWin *tw, int x, int y) {}
@ -101,6 +105,7 @@ static const TermWinVtable fuzz_termwin_vt = {
fuzz_setup_draw_ctx,
fuzz_draw_text,
fuzz_draw_cursor,
fuzz_draw_trust_sigil,
fuzz_char_width,
fuzz_free_draw_ctx,
fuzz_set_cursor_pos,