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Enable wide-character support in logs

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This commit is contained in:
Artem Egorenkov 2021-04-08 15:11:14 +02:00
parent 87915b320d
commit d48775fd3a
2 changed files with 222 additions and 1 deletions
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215
vsftpd-3.0.3-enable_wc_logs-replace_unprintable_with_hex.patch Normal file
View File

@ -0,0 +1,215 @@
diff --git a/logging.c b/logging.c
index 9e86808..613ff4b 100644
--- a/logging.c
+++ b/logging.c
@@ -171,7 +171,14 @@ vsf_log_do_log_to_file(int fd, struct mystr* p_str)
return;
}
}
- str_replace_unprintable(p_str, '?');
+ if (tunable_wc_logs_enable)
+ {
+ str_replace_unprintable_with_hex_wc(p_str);
+ }
+ else
+ {
+ str_replace_unprintable_with_hex(p_str);
+ }
str_append_char(p_str, '\n');
/* Ignore write failure; maybe the disk filled etc. */
(void) str_write_loop(p_str, fd);
diff --git a/parseconf.c b/parseconf.c
index 3cfe7da..3729818 100644
--- a/parseconf.c
+++ b/parseconf.c
@@ -113,6 +113,7 @@ parseconf_bool_array[] =
{ "allow_writeable_chroot", &tunable_allow_writeable_chroot },
{ "better_stou", &tunable_better_stou },
{ "log_die", &tunable_log_die },
+ { "wc_logs_enable", &tunable_wc_logs_enable },
{ 0, 0 }
};
diff --git a/str.c b/str.c
index 82b8ae4..a4e81d6 100644
--- a/str.c
+++ b/str.c
@@ -20,6 +20,11 @@
#include "utility.h"
#include "sysutil.h"
+#include <stdio.h>
+#include <string.h>
+#include <wchar.h>
+#include <wctype.h>
+
/* File local functions */
static void str_split_text_common(struct mystr* p_src, struct mystr* p_rhs,
const char* p_text, int is_reverse);
@@ -723,6 +728,102 @@ str_replace_unprintable(struct mystr* p_str, char new_char)
}
}
+void
+str_replace_unprintable_with_hex(struct mystr* p_str)
+{
+ unsigned int ups_size = sizeof(unsigned int) * (p_str->len);
+ if (ups_size < p_str->len)
+ {
+ str_replace_unprintable(p_str, '?');
+ str_append_text(p_str, ": BUG: string is too long");
+ bug(p_str->p_buf);
+ }
+ unsigned int* ups = vsf_sysutil_malloc(ups_size);
+ unsigned int up_count = 0;
+ for (unsigned int i=0; i < p_str->len; i++)
+ {
+ if (!vsf_sysutil_isprint(p_str->p_buf[i]))
+ {
+ ups[up_count++] = i;
+ }
+ }
+ str_replace_positions_with_hex(p_str, ups, up_count);
+ vsf_sysutil_free(ups);
+}
+
+void str_replace_unprintable_with_hex_wc(struct mystr* p_str)
+{
+ unsigned int ups_size = sizeof(unsigned int) * (p_str->len);
+ if (ups_size < p_str->len)
+ {
+ str_replace_unprintable(p_str, '?');
+ str_append_text(p_str, ": BUG: string is too long");
+ bug(p_str->p_buf);
+ }
+ unsigned int* ups = vsf_sysutil_malloc(ups_size);
+ unsigned int up_count = 0;
+
+ size_t current = 0;
+ wchar_t pwc;
+ mbstate_t ps;
+ memset(&ps, 0, sizeof(ps));
+ ssize_t len = 0;
+ while ((len = mbrtowc(&pwc, p_str->p_buf, p_str->len - current, &ps)) > 0)
+ {
+ if (!iswprint(pwc))
+ {
+ for (unsigned int i = 0; i < len; i++)
+ {
+ ups[up_count++] = current++;
+ }
+ }
+ else
+ {
+ current += len;
+ }
+ }
+ if (len < 0)
+ {
+ while (current < p_str->len)
+ {
+ ups[up_count++] = current++;
+ }
+ }
+ str_replace_positions_with_hex(p_str, ups, up_count);
+ vsf_sysutil_free(ups);
+}
+
+void
+str_replace_positions_with_hex(struct mystr* p_str, const unsigned int* poss, const unsigned int pos_count)
+{
+ if (pos_count == 0)
+ return;
+
+ struct mystr tmp_str = INIT_MYSTR;
+ str_reserve(&tmp_str, p_str->len + 3 * pos_count);
+ unsigned int current = 0;
+
+ for (unsigned int i=0; i < pos_count; i++)
+ {
+ unsigned int pos = poss[i];
+
+ if (current < pos)
+ private_str_append_memchunk(&tmp_str, p_str->p_buf + current, pos - current);
+
+ char hex_buf[5];
+ memset(hex_buf, 0, sizeof(hex_buf));
+ sprintf(hex_buf, "\\x%02X", (unsigned char) p_str->p_buf[pos]);
+ str_append_text(&tmp_str, hex_buf);
+ current = pos + 1;
+ }
+
+ if (current < p_str->len)
+ private_str_append_memchunk(&tmp_str, p_str->p_buf + current, p_str->len - current);
+
+ str_copy(p_str, &tmp_str);
+ str_free(&tmp_str);
+}
+
void
str_basename (struct mystr* d_str, const struct mystr* path)
{
diff --git a/str.h b/str.h
index 44270da..95a83b5 100644
--- a/str.h
+++ b/str.h
@@ -98,6 +98,10 @@ int str_contains_space(const struct mystr* p_str);
int str_all_space(const struct mystr* p_str);
int str_contains_unprintable(const struct mystr* p_str);
void str_replace_unprintable(struct mystr* p_str, char new_char);
+void str_replace_unprintable_with_hex(struct mystr* p_str);
+void str_replace_unprintable_with_hex_wc(struct mystr* p_str);
+void str_replace_positions_with_hex(struct mystr* p_str, const unsigned int* poss,
+ const unsigned int pos_count);
int str_atoi(const struct mystr* p_str);
filesize_t str_a_to_filesize_t(const struct mystr* p_str);
unsigned int str_octal_to_uint(const struct mystr* p_str);
diff --git a/tunables.c b/tunables.c
index a7ce9c8..c96c1ac 100644
--- a/tunables.c
+++ b/tunables.c
@@ -94,6 +94,7 @@ int tunable_seccomp_sandbox;
int tunable_allow_writeable_chroot;
int tunable_better_stou;
int tunable_log_die;
+int tunable_wc_logs_enable;
unsigned int tunable_accept_timeout;
unsigned int tunable_connect_timeout;
@@ -244,6 +245,7 @@ tunables_load_defaults()
tunable_allow_writeable_chroot = 0;
tunable_better_stou = 0;
tunable_log_die = 0;
+ tunable_wc_logs_enable = 0;
tunable_accept_timeout = 60;
tunable_connect_timeout = 60;
diff --git a/tunables.h b/tunables.h
index 029d645..8d50150 100644
--- a/tunables.h
+++ b/tunables.h
@@ -98,6 +98,7 @@ extern int tunable_better_stou; /* Use better file name generation
*/
extern int tunable_log_die; /* Log calls to die(), die2()
* and bug() */
+extern int tunable_wc_logs_enable; /* Allow non ASCII characters in logs */
/* Integer/numeric defines */
extern unsigned int tunable_accept_timeout;
diff --git a/vsftpd.conf.5 b/vsftpd.conf.5
index ce3fba3..815773f 100644
--- a/vsftpd.conf.5
+++ b/vsftpd.conf.5
@@ -735,6 +735,12 @@ If enabled, use CLONE_NEWPID and CLONE_NEWIPC to isolate processes to their
ipc and pid namespaces. So separated processes can not interact with each other.
Default: YES
+.TP
+.B wc_logs_enable
+If enabled, logs will be treated as wide-character strings and not just
+ASCII strings when filtering out non-printable characters.
+
+Default: NO
.SH NUMERIC OPTIONS
Below is a list of numeric options. A numeric option must be set to a non

8
vsftpd.spec
View File

@ -2,7 +2,7 @@
Name: vsftpd
Version: 3.0.3
Release: 43%{?dist}
Release: 44%{?dist}
Summary: Very Secure Ftp Daemon
# OpenSSL link exception
@ -97,6 +97,8 @@ Patch67: 0001-Fix-timestamp-handling-in-MDTM.patch
Patch68: 0002-Drop-an-unused-global-variable.patch
Patch69: 0001-Remove-a-hint-about-the-ftp_home_dir-SELinux-boolean.patch
Patch70: fix-str_open.patch
# upstream commits 56402c0, 8b82e73
Patch71: vsftpd-3.0.3-enable_wc_logs-replace_unprintable_with_hex.patch
%description
vsftpd is a Very Secure FTP daemon. It was written completely from
@ -165,6 +167,10 @@ mkdir -p $RPM_BUILD_ROOT/%{_var}/ftp/pub
%{_var}/ftp
%changelog
* Wed Apr 8 2021 Artem Egorenkov <aegorenk@redhat.com> - 3.0.3-44
- Enable support for wide-character strings in logs
- Replace unprintables with HEX code, not question marks
* Tue Mar 02 2021 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> - 3.0.3-43
- Rebuilt for updated systemd-rpm-macros
See https://pagure.io/fesco/issue/2583.