From 1121b4e568b340cfe2a9b7fc41fb48f4d684ad47 Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Thu, 5 Oct 2017 17:18:23 +0200 Subject: [PATCH] sendmail allow "=" symbol in recipient, closes 10241 Signed-off-by: Denys Vlasenko --- mailutils/sendmail.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/mailutils/sendmail.c b/mailutils/sendmail.c index defbd9552..4ca91fad8 100644 --- a/mailutils/sendmail.c +++ b/mailutils/sendmail.c @@ -150,7 +150,13 @@ static char *sane_address(char *str) trim(str); s = str; while (*s) { - if (!isalnum(*s) && !strchr("+_-.@", *s)) { + /* Standard allows these chars in username without quoting: + * /!#$%&'*+-=?^_`{|}~ + * and allows dot (.) with some restrictions. + * I chose to only allow a saner subset. + * I propose to expand it only on user's request. + */ + if (!isalnum(*s) && !strchr("=+_-.@", *s)) { bb_error_msg("bad address '%s'", str); /* returning "": */ str[0] = '\0'; -- 2.25.1