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Fix printing percent characters

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As noted in #1481, testssl.sh has a problem with printing percent ('%') characters.

At one point, the function out() was implemented as `/usr/bin/printf -- "${1//%/%%}"`. When this was the case, any '%' needed to be replaced with '%%' since '$1' was being used as the format string. This was changed, however, by 8a2fe5915a. Since the format string is now "%b" rather than '$1', the replacement is not needed anymore. Instead, the replacement now causes any '%' to be printed to be duplicated.

This problem does not happen very often, but does sometimes occur when a '%' character appears in a URI, such as in an HTTP redirect, a certificate revocation list, or an OCSP URI.
This commit is contained in:
David Cooper
2020-02-10 11:20:40 -05:00
parent 466f08c846
commit 37dbe14def
1 changed files with 6 additions and 7 deletions
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testssl.sh
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@@ -501,17 +501,16 @@ html_reserved(){
html_out() { html_out() {
"$do_html" || return 0 "$do_html" || return 0
[[ -n "$HTMLFILE" ]] && [[ ! -d "$HTMLFILE" ]] && printf -- "%b" "${1//%/%%}" >> "$HTMLFILE" [[ -n "$HTMLFILE" ]] && [[ ! -d "$HTMLFILE" ]] && printf -- "%b" "$1" >> "$HTMLFILE"
# here and other printf's: a little bit of sanitizing with bash internal search&replace -- otherwise printf will hiccup at '%'. '--' and %b do the rest.
} }
# This is intentionally the same. # This is intentionally the same.
safe_echo() { printf -- "%b" "${1//%/%%}"; } safe_echo() { printf -- "%b" "$1"; }
tm_out() { printf -- "%b" "${1//%/%%}"; } tm_out() { printf -- "%b" "$1"; }
tmln_out() { printf -- "%b" "${1//%/%%}\n"; } tmln_out() { printf -- "%b" "$1\n"; }
out() { printf -- "%b" "${1//%/%%}"; html_out "$(html_reserved "$1")"; } out() { printf -- "%b" "$1"; html_out "$(html_reserved "$1")"; }
outln() { printf -- "%b" "${1//%/%%}\n"; html_out "$(html_reserved "$1")\n"; } outln() { printf -- "%b" "$1\n"; html_out "$(html_reserved "$1")\n"; }
#TODO: Still no shell injection safe but if just run it from the cmd line: that's fine #TODO: Still no shell injection safe but if just run it from the cmd line: that's fine