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Escape control characters in log messages and "sudoreplay -l" output.

Browse Source 
The log message contains user-controlled strings that could include
things like terminal control characters.  Space characters in the
command path are now also escaped.

Command line arguments that contain spaces are surrounded with
single quotes and any literal single quote or backslash characters
are escaped with a backslash.  This makes it possible to distinguish
multiple command line arguments from a single argument that contains
spaces.

Issue found by Matthieu Barjole and Victor Cutillas of Synacktiv
(https://synacktiv.com).
This commit is contained in:
Todd C. Miller
2023-01-18 08:21:34 -07:00
parent 77557f8f19
commit 334daf92b3
10 changed files with 382 additions and 224 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
docs/sudoers.man.in
View File

@@ -5877,14 +5877,31 @@ can log events via
syslog(3),
to a local log file, or both.
The log format is almost identical in both cases.
Any control characters present in the log data are formatted in octal
with a leading
\(oq#\(cq
character.
For example, a horizontal tab is stored as
\(oq#011\(cq
and an embedded carriage return is stored as
\(oq#015\(cq.
In addition, space characters in the command path are stored as
\(oq#040\(cq.
Command line arguments that contain spaces are enclosed in single quotes
('').
This makes it possible to distinguish multiple command line arguments
from a single argument that contains spaces.
Literal single quotes and backslash characters
(\(oq\e\(cq)
in command line arguments are escaped with a backslash.
.SS "Accepted command log entries"
Commands that sudo runs are logged using the following format (split
into multiple lines for readability):
.nf
.sp
.RS 4n
date hostname progname: username : TTY=ttyname ; PWD=cwd ; \e
USER=runasuser ; GROUP=runasgroup ; TSID=logid ; \e
date hostname progname: username : TTY=ttyname ; CHROOT=chroot ; \e
PWD=cwd ; USER=runasuser ; GROUP=runasgroup ; TSID=logid ; \e
ENV=env_vars COMMAND=command
.RE
.fi
@@ -5933,6 +5950,9 @@ was run on, or
\(lqunknown\(rq
if there was no terminal present.
.TP 14n
chroot
The root directory that the command was run in, if one was specified.
.TP 14n
cwd
The current working directory that
\fBsudo\fR
@@ -5957,7 +5977,7 @@ A list of environment variables specified on the command line,
if specified.
.TP 14n
command
The actual command that was executed.
The actual command that was executed, including any command line arguments.
.PP
Messages are logged using the locale specified by
\fIsudoers_locale\fR,
@@ -6195,17 +6215,21 @@ with a few important differences:
1.\&
The
\fIprogname\fR
and
\fIhostname\fR
fields are not present.
field is not present.
.TP 5n
2.\&
If the
\fIlog_year\fR
option is enabled,
the date will also include the year.
The
\fIhostname\fR
is only logged if the
\fIlog_host\fR
option is enabled.
.TP 5n
3.\&
The date does not include the year unless the
\fIlog_year\fR
option is enabled.
.TP 5n
4.\&
Lines that are longer than
\fIloglinelen\fR
characters (80 by default) are word-wrapped and continued on the

40
docs/sudoers.mdoc.in
View File

@@ -5503,12 +5503,29 @@ can log events via
.Xr syslog 3 ,
to a local log file, or both.
The log format is almost identical in both cases.
Any control characters present in the log data are formatted in octal
with a leading
.Ql #
character.
For example, a horizontal tab is stored as
.Ql #011
and an embedded carriage return is stored as
.Ql #015 .
In addition, space characters in the command path are stored as
.Ql #040 .
Command line arguments that contain spaces are enclosed in single quotes
.Pq '' .
This makes it possible to distinguish multiple command line arguments
from a single argument that contains spaces.
Literal single quotes and backslash characters
.Pq Ql \e
in command line arguments are escaped with a backslash.
.Ss Accepted command log entries
Commands that sudo runs are logged using the following format (split
into multiple lines for readability):
.Bd -literal -offset 4n
date hostname progname: username : TTY=ttyname ; PWD=cwd ; \e
USER=runasuser ; GROUP=runasgroup ; TSID=logid ; \e
date hostname progname: username : TTY=ttyname ; CHROOT=chroot ; \e
PWD=cwd ; USER=runasuser ; GROUP=runasgroup ; TSID=logid ; \e
ENV=env_vars COMMAND=command
.Ed
.Pp
@@ -5551,6 +5568,8 @@ or
was run on, or
.Dq unknown
if there was no terminal present.
.It chroot
The root directory that the command was run in, if one was specified.
.It cwd
The current working directory that
.Nm sudo
@@ -5570,7 +5589,7 @@ option is enabled.
A list of environment variables specified on the command line,
if specified.
.It command
The actual command that was executed.
The actual command that was executed, including any command line arguments.
.El
.Pp
Messages are logged using the locale specified by
@@ -5794,14 +5813,17 @@ with a few important differences:
.It
The
.Em progname
and
.Em hostname
fields are not present.
field is not present.
.It
If the
The
.Em hostname
is only logged if the
.Em log_host
option is enabled.
.It
The date does not include the year unless the
.Em log_year
option is enabled,
the date will also include the year.
option is enabled.
.It
Lines that are longer than
.Em loglinelen

9
docs/sudoreplay.man.in
View File

@@ -170,6 +170,15 @@ In this mode,
will list available sessions in a format similar to the
\fBsudo\fR
log file format, sorted by file name (or sequence number).
Any control characters present in the log data are formated in octal
with a leading
\(oq#\(cq
character.
For example, a horizontal tab is displayed as
\(oq#011\(cq
and an embedded carriage return is displayed as
\(oq#015\(cq.
.sp
If a
\fIsearch expression\fR
is specified, it will be used to restrict the IDs that are displayed.

10
docs/sudoreplay.mdoc.in
View File

@@ -162,6 +162,16 @@ In this mode,
will list available sessions in a format similar to the
.Nm sudo
log file format, sorted by file name (or sequence number).
Any control characters present in the log data are formatted in octal
with a leading
.Ql #
character.
For example, a horizontal tab is displayed as
.Ql #011
and an embedded carriage return is displayed as
.Ql #015 .
Space characters in the command name and arguments are also formatted in octal.
.Pp
If a
.Ar search expression
is specified, it will be used to restrict the IDs that are displayed.

7
include/sudo_lbuf.h
View File

@@ -36,9 +36,15 @@ struct sudo_lbuf {
typedef int (*sudo_lbuf_output_t)(const char *);
/* Flags for sudo_lbuf_append_esc() */
#define LBUF_ESC_CNTRL 0x01
#define LBUF_ESC_BLANK 0x02
#define LBUF_ESC_QUOTE 0x04
sudo_dso_public void sudo_lbuf_init_v1(struct sudo_lbuf *lbuf, sudo_lbuf_output_t output, int indent, const char *continuation, int cols);
sudo_dso_public void sudo_lbuf_destroy_v1(struct sudo_lbuf *lbuf);
sudo_dso_public bool sudo_lbuf_append_v1(struct sudo_lbuf *lbuf, const char *fmt, ...) sudo_printflike(2, 3);
sudo_dso_public bool sudo_lbuf_append_esc_v1(struct sudo_lbuf *lbuf, int flags, const char *fmt, ...) sudo_printflike(3, 4);
sudo_dso_public bool sudo_lbuf_append_quoted_v1(struct sudo_lbuf *lbuf, const char *set, const char *fmt, ...) sudo_printflike(3, 4);
sudo_dso_public void sudo_lbuf_print_v1(struct sudo_lbuf *lbuf);
sudo_dso_public bool sudo_lbuf_error_v1(struct sudo_lbuf *lbuf);
@@ -47,6 +53,7 @@ sudo_dso_public void sudo_lbuf_clearerr_v1(struct sudo_lbuf *lbuf);
#define sudo_lbuf_init(_a, _b, _c, _d, _e) sudo_lbuf_init_v1((_a), (_b), (_c), (_d), (_e))
#define sudo_lbuf_destroy(_a) sudo_lbuf_destroy_v1((_a))
#define sudo_lbuf_append sudo_lbuf_append_v1
#define sudo_lbuf_append_esc sudo_lbuf_append_esc_v1
#define sudo_lbuf_append_quoted sudo_lbuf_append_quoted_v1
#define sudo_lbuf_print(_a) sudo_lbuf_print_v1((_a))
#define sudo_lbuf_error(_a) sudo_lbuf_error_v1((_a))

208
lib/eventlog/eventlog.c
View File

@@ -1,7 +1,7 @@
/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 1994-1996, 1998-2021 Todd C. Miller <Todd.Miller@sudo.ws>
* Copyright (c) 1994-1996, 1998-2023 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
@@ -51,24 +51,13 @@
#include "sudo_compat.h"
#include "sudo_debug.h"
#include "sudo_eventlog.h"
#include "sudo_lbuf.h"
#include "sudo_fatal.h"
#include "sudo_gettext.h"
#include "sudo_json.h"
#include "sudo_queue.h"
#include "sudo_util.h"
#define LL_HOST_STR "HOST="
#define LL_TTY_STR "TTY="
#define LL_CHROOT_STR "CHROOT="
#define LL_CWD_STR "PWD="
#define LL_USER_STR "USER="
#define LL_GROUP_STR "GROUP="
#define LL_ENV_STR "ENV="
#define LL_CMND_STR "COMMAND="
#define LL_TSID_STR "TSID="
#define LL_EXIT_STR "EXIT="
#define LL_SIGNAL_STR "SIGNAL="
#define IS_SESSID(s) ( \
isalnum((unsigned char)(s)[0]) && isalnum((unsigned char)(s)[1]) && \
(s)[2] == '/' && \
@@ -93,26 +82,28 @@ new_logline(int event_type, int flags, struct eventlog_args *args,
const struct eventlog *evlog)
{
const struct eventlog_config *evl_conf = eventlog_getconf();
char *line = NULL, *evstr = NULL;
const char *iolog_file;
const char *tty, *tsid = NULL;
char exit_str[(((sizeof(int) * 8) + 2) / 3) + 2];
char sessid[7], offsetstr[64] = "";
size_t len = 0;
struct sudo_lbuf lbuf;
int i;
debug_decl(new_logline, SUDO_DEBUG_UTIL);
sudo_lbuf_init(&lbuf, NULL, 0, NULL, 0);
if (ISSET(flags, EVLOG_RAW) || evlog == NULL) {
if (args->reason != NULL) {
if (args->errstr != NULL) {
if (asprintf(&line, "%s: %s", args->reason, args->errstr) == -1)
goto oom;
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL, "%s: %s",
args->reason, args->errstr);
} else {
if ((line = strdup(args->reason)) == NULL)
goto oom;
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL, "%s", args->reason);
}
if (sudo_lbuf_error(&lbuf))
goto oom;
}
debug_return_str(line);
debug_return_str(lbuf.buf);
}
/* A TSID may be a sudoers-style session ID or a free-form string. */
@@ -150,169 +141,90 @@ new_logline(int event_type, int flags, struct eventlog_args *args,
}
/*
* Compute line length
* Format the log line as an lbuf, escaping control characters in
* octal form (#0nn). Error checking (ENOMEM) is done at the end.
*/
if (args->reason != NULL)
len += strlen(args->reason) + 3;
if (args->errstr != NULL)
len += strlen(args->errstr) + 3;
if (evlog->submithost != NULL && !evl_conf->omit_hostname)
len += sizeof(LL_HOST_STR) + 2 + strlen(evlog->submithost);
if (tty != NULL)
len += sizeof(LL_TTY_STR) + 2 + strlen(tty);
if (evlog->runchroot != NULL)
len += sizeof(LL_CHROOT_STR) + 2 + strlen(evlog->runchroot);
if (evlog->runcwd != NULL)
len += sizeof(LL_CWD_STR) + 2 + strlen(evlog->runcwd);
if (evlog->runuser != NULL)
len += sizeof(LL_USER_STR) + 2 + strlen(evlog->runuser);
if (evlog->rungroup != NULL)
len += sizeof(LL_GROUP_STR) + 2 + strlen(evlog->rungroup);
if (tsid != NULL) {
len += sizeof(LL_TSID_STR) + 2 + strlen(tsid) + strlen(offsetstr);
}
if (evlog->env_add != NULL) {
size_t evlen = 0;
char * const *ep;
for (ep = evlog->env_add; *ep != NULL; ep++)
evlen += strlen(*ep) + 1;
if (evlen != 0) {
if ((evstr = malloc(evlen)) == NULL)
goto oom;
ep = evlog->env_add;
if (strlcpy(evstr, *ep, evlen) >= evlen)
goto toobig;
while (*++ep != NULL) {
if (strlcat(evstr, " ", evlen) >= evlen ||
strlcat(evstr, *ep, evlen) >= evlen)
goto toobig;
}
len += sizeof(LL_ENV_STR) + 2 + evlen;
}
}
if (evlog->command != NULL) {
len += sizeof(LL_CMND_STR) - 1 + strlen(evlog->command);
if (evlog->argv != NULL && evlog->argv[0] != NULL) {
for (i = 1; evlog->argv[i] != NULL; i++)
len += strlen(evlog->argv[i]) + 1;
}
if (event_type == EVLOG_EXIT) {
if (evlog->signal_name != NULL)
len += sizeof(LL_SIGNAL_STR) + 2 + strlen(evlog->signal_name);
if (evlog->exit_value != -1) {
(void)snprintf(exit_str, sizeof(exit_str), "%d", evlog->exit_value);
len += sizeof(LL_EXIT_STR) + 2 + strlen(exit_str);
}
}
}
/*
* Allocate and build up the line.
*/
if ((line = malloc(++len)) == NULL)
goto oom;
line[0] = '\0';
if (args->reason != NULL) {
if (strlcat(line, args->reason, len) >= len ||
strlcat(line, args->errstr ? " : " : " ; ", len) >= len)
goto toobig;
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL, "%s%s", args->reason,
args->errstr ? " : " : " ; ");
}
if (args->errstr != NULL) {
if (strlcat(line, args->errstr, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL, "%s ; ", args->errstr);
}
if (evlog->submithost != NULL && !evl_conf->omit_hostname) {
if (strlcat(line, LL_HOST_STR, len) >= len ||
strlcat(line, evlog->submithost, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL, "HOST=%s ; ",
evlog->submithost);
}
if (tty != NULL) {
if (strlcat(line, LL_TTY_STR, len) >= len ||
strlcat(line, tty, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL, "TTY=%s ; ", tty);
}
if (evlog->runchroot != NULL) {
if (strlcat(line, LL_CHROOT_STR, len) >= len ||
strlcat(line, evlog->runchroot, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL, "CHROOT=%s ; ",
evlog->runchroot);
}
if (evlog->runcwd != NULL) {
if (strlcat(line, LL_CWD_STR, len) >= len ||
strlcat(line, evlog->runcwd, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL, "PWD=%s ; ",
evlog->runcwd);
}
if (evlog->runuser != NULL) {
if (strlcat(line, LL_USER_STR, len) >= len ||
strlcat(line, evlog->runuser, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL, "USER=%s ; ",
evlog->runuser);
}
if (evlog->rungroup != NULL) {
if (strlcat(line, LL_GROUP_STR, len) >= len ||
strlcat(line, evlog->rungroup, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL, "GROUP=%s ; ",
evlog->rungroup);
}
if (tsid != NULL) {
if (strlcat(line, LL_TSID_STR, len) >= len ||
strlcat(line, tsid, len) >= len ||
strlcat(line, offsetstr, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL, "TSID=%s%s ; ", tsid,
offsetstr);
}
if (evstr != NULL) {
if (strlcat(line, LL_ENV_STR, len) >= len ||
strlcat(line, evstr, len) >= len ||
strlcat(line, " ; ", len) >= len)
goto toobig;
free(evstr);
evstr = NULL;
if (evlog->env_add != NULL && evlog->env_add[0] != NULL) {
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL, "ENV=%s",
evlog->env_add[0]);
for (i = 1; evlog->env_add[i] != NULL; i++) {
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL, " %s",
evlog->env_add[i]);
}
}
if (evlog->command != NULL) {
if (strlcat(line, LL_CMND_STR, len) >= len)
goto toobig;
if (strlcat(line, evlog->command, len) >= len)
goto toobig;
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL|LBUF_ESC_BLANK,
"COMMAND=%s", evlog->command);
if (evlog->argv != NULL && evlog->argv[0] != NULL) {
for (i = 1; evlog->argv[i] != NULL; i++) {
if (strlcat(line, " ", len) >= len ||
strlcat(line, evlog->argv[i], len) >= len)
goto toobig;
sudo_lbuf_append(&lbuf, " ");
if (strchr(evlog->argv[i], ' ') != NULL) {
/* Wrap args containing spaces in single quotes. */
sudo_lbuf_append(&lbuf, "'");
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL|LBUF_ESC_QUOTE,
"%s", evlog->argv[i]);
sudo_lbuf_append(&lbuf, "'");
} else {
/* Escape quotes here too for consistency. */
sudo_lbuf_append_esc(&lbuf,
LBUF_ESC_CNTRL|LBUF_ESC_BLANK|LBUF_ESC_QUOTE,
"%s", evlog->argv[i]);
}
}
}
if (event_type == EVLOG_EXIT) {
if (evlog->signal_name != NULL) {
if (strlcat(line, " ; ", len) >= len ||
strlcat(line, LL_SIGNAL_STR, len) >= len ||
strlcat(line, evlog->signal_name, len) >= len)
goto toobig;
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL, " ; SIGNAL=%s",
evlog->signal_name);
}
if (evlog->exit_value != -1) {
if (strlcat(line, " ; ", len) >= len ||
strlcat(line, LL_EXIT_STR, len) >= len ||
strlcat(line, exit_str, len) >= len)
goto toobig;
(void)snprintf(exit_str, sizeof(exit_str), "%d",
evlog->exit_value);
sudo_lbuf_append_esc(&lbuf, LBUF_ESC_CNTRL, " ; EXIT=%s",
exit_str);
}
}
}
debug_return_str(line);
if (!sudo_lbuf_error(&lbuf))
debug_return_str(lbuf.buf);
oom:
free(evstr);
sudo_lbuf_destroy(&lbuf);
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
debug_return_str(NULL);
toobig:
free(evstr);
free(line);
sudo_warnx(U_("internal error, %s overflow"), __func__);
debug_return_str(NULL);
}
static void

39
lib/iolog/iolog_json.c
View File

@@ -551,45 +551,6 @@ iolog_parse_json_object(struct json_object *object, struct eventlog *evlog)
}
}
/* Merge cmd and argv as sudoreplay expects. */
if (evlog->command != NULL && evlog->argv != NULL && evlog->argv[0] != NULL) {
size_t len, bufsize = strlen(evlog->command) + 1;
char *cp, *buf;
int ac;
/* Skip argv[0], we use evlog->command instead. */
for (ac = 1; evlog->argv[ac] != NULL; ac++)
bufsize += strlen(evlog->argv[ac]) + 1;
if ((buf = malloc(bufsize)) == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto done;
}
cp = buf;
len = strlcpy(cp, evlog->command, bufsize);
if (len >= bufsize)
sudo_fatalx(U_("internal error, %s overflow"), __func__);
cp += len;
bufsize -= len;
for (ac = 1; evlog->argv[ac] != NULL; ac++) {
if (bufsize < 2)
sudo_fatalx(U_("internal error, %s overflow"), __func__);
*cp++ = ' ';
bufsize--;
len = strlcpy(cp, evlog->argv[ac], bufsize);
if (len >= bufsize)
sudo_fatalx(U_("internal error, %s overflow"), __func__);
cp += len;
bufsize -= len;
}
free(evlog->command);
evlog->command = buf;
}
ret = true;
done:

106
lib/util/lbuf.c
View File

@@ -94,6 +94,112 @@ sudo_lbuf_expand(struct sudo_lbuf *lbuf, unsigned int extra)
debug_return_bool(true);
}
/*
* Escape a character in octal form (#0n) and store it as a string
* in buf, which must have at least 6 bytes available.
* Returns the length of buf, not counting the terminating NUL byte.
*/
static int
escape(unsigned char ch, char *buf)
{
const int len = ch < 0100 ? (ch < 010 ? 3 : 4) : 5;
/* Work backwards from the least significant digit to most significant. */
switch (len) {
case 5:
buf[4] = (ch & 7) + '0';
ch >>= 3;
FALLTHROUGH;
case 4:
buf[3] = (ch & 7) + '0';
ch >>= 3;
FALLTHROUGH;
case 3:
buf[2] = (ch & 7) + '0';
buf[1] = '0';
buf[0] = '#';
break;
}
buf[len] = '\0';
return len;
}
/*
* Parse the format and append strings, only %s and %% escapes are supported.
* Any non-printable characters are escaped in octal as #0nn.
*/
bool
sudo_lbuf_append_esc_v1(struct sudo_lbuf *lbuf, int flags, const char *fmt, ...)
{
unsigned int saved_len = lbuf->len;
bool ret = false;
const char *s;
va_list ap;
debug_decl(sudo_lbuf_append_esc, SUDO_DEBUG_UTIL);
if (sudo_lbuf_error(lbuf))
debug_return_bool(false);
#define should_escape(ch) \
((ISSET(flags, LBUF_ESC_CNTRL) && iscntrl((unsigned char)ch)) || \
(ISSET(flags, LBUF_ESC_BLANK) && isblank((unsigned char)ch)))
#define should_quote(ch) \
(ISSET(flags, LBUF_ESC_QUOTE) && (ch == '\'' || ch == '\\'))
va_start(ap, fmt);
while (*fmt != '\0') {
if (fmt[0] == '%' && fmt[1] == 's') {
if ((s = va_arg(ap, char *)) == NULL)
s = "(NULL)";
while (*s != '\0') {
if (should_escape(*s)) {
if (!sudo_lbuf_expand(lbuf, sizeof("#0177") - 1))
goto done;
lbuf->len += escape(*s++, lbuf->buf + lbuf->len);
continue;
}
if (should_quote(*s)) {
if (!sudo_lbuf_expand(lbuf, 2))
goto done;
lbuf->buf[lbuf->len++] = '\\';
lbuf->buf[lbuf->len++] = *s++;
continue;
}
if (!sudo_lbuf_expand(lbuf, 1))
goto done;
lbuf->buf[lbuf->len++] = *s++;
}
fmt += 2;
continue;
}
if (should_escape(*fmt)) {
if (!sudo_lbuf_expand(lbuf, sizeof("#0177") - 1))
goto done;
if (*fmt == '\'') {
lbuf->buf[lbuf->len++] = '\\';
lbuf->buf[lbuf->len++] = *fmt++;
} else {
lbuf->len += escape(*fmt++, lbuf->buf + lbuf->len);
}
continue;
}
if (!sudo_lbuf_expand(lbuf, 1))
goto done;
lbuf->buf[lbuf->len++] = *fmt++;
}
ret = true;
done:
if (!ret)
lbuf->len = saved_len;
if (lbuf->size != 0)
lbuf->buf[lbuf->len] = '\0';
va_end(ap);
debug_return_bool(ret);
}
/*
* Parse the format and append strings, only %s and %% escapes are supported.
* Any characters in set are quoted with a backslash.

1
lib/util/util.exp.in
View File

@@ -100,6 +100,7 @@ sudo_json_init_v1
sudo_json_init_v2
sudo_json_open_array_v1
sudo_json_open_object_v1
sudo_lbuf_append_esc_v1
sudo_lbuf_append_quoted_v1
sudo_lbuf_append_v1
sudo_lbuf_clearerr_v1

142
plugins/sudoers/sudoreplay.c
View File

@@ -62,6 +62,7 @@
#include "sudo_debug.h"
#include "sudo_event.h"
#include "sudo_eventlog.h"
#include "sudo_lbuf.h"
#include "sudo_fatal.h"
#include "sudo_gettext.h"
#include "sudo_iolog.h"
@@ -373,6 +374,10 @@ main(int argc, char *argv[])
if ((evlog = iolog_parse_loginfo(iolog_dir_fd, iolog_dir)) == NULL)
goto done;
printf(_("Replaying sudo session: %s"), evlog->command);
if (evlog->argv != NULL && evlog->argv[0] != NULL) {
for (i = 1; evlog->argv[i] != NULL; i++)
printf(" %s", evlog->argv[i]);
}
/* Setup terminal if appropriate. */
if (!isatty(STDIN_FILENO) || !isatty(STDOUT_FILENO))
@@ -1315,11 +1320,57 @@ parse_expr(struct search_node_list *head, char *argv[], bool sub_expr)
debug_return_int(av - argv);
}
static char *
expand_command(struct eventlog *evlog, char **newbuf)
{
size_t len, bufsize = strlen(evlog->command) + 1;
char *cp, *buf;
int ac;
debug_decl(expand_command, SUDO_DEBUG_UTIL);
if (evlog->argv == NULL || evlog->argv[0] == NULL || evlog->argv[1] == NULL) {
/* No arguments, we can use the command as-is. */
*newbuf = NULL;
debug_return_str(evlog->command);
}
/* Skip argv[0], we use evlog->command instead. */
for (ac = 1; evlog->argv[ac] != NULL; ac++)
bufsize += strlen(evlog->argv[ac]) + 1;
if ((buf = malloc(bufsize)) == NULL)
sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
cp = buf;
len = strlcpy(cp, evlog->command, bufsize);
if (len >= bufsize)
sudo_fatalx(U_("internal error, %s overflow"), __func__);
cp += len;
bufsize -= len;
for (ac = 1; evlog->argv[ac] != NULL; ac++) {
if (bufsize < 2)
sudo_fatalx(U_("internal error, %s overflow"), __func__);
*cp++ = ' ';
bufsize--;
len = strlcpy(cp, evlog->argv[ac], bufsize);
if (len >= bufsize)
sudo_fatalx(U_("internal error, %s overflow"), __func__);
cp += len;
bufsize -= len;
}
*newbuf = buf;
debug_return_str(buf);
}
static bool
match_expr(struct search_node_list *head, struct eventlog *evlog, bool last_match)
{
struct search_node *sn;
bool res = false, matched = last_match;
char *tofree;
int rc;
debug_decl(match_expr, SUDO_DEBUG_UTIL);
@@ -1353,13 +1404,15 @@ match_expr(struct search_node_list *head, struct eventlog *evlog, bool last_matc
res = strcmp(sn->u.user, evlog->submituser) == 0;
break;
case ST_PATTERN:
rc = regexec(&sn->u.cmdre, evlog->command, 0, NULL, 0);
rc = regexec(&sn->u.cmdre, expand_command(evlog, &tofree),
0, NULL, 0);
if (rc && rc != REG_NOMATCH) {
char buf[BUFSIZ];
regerror(rc, &sn->u.cmdre, buf, sizeof(buf));
sudo_fatalx("%s", buf);
}
res = rc == REG_NOMATCH ? 0 : 1;
free(tofree);
break;
case ST_FROMDATE:
res = sudo_timespeccmp(&evlog->submit_time, &sn->u.tstamp, >=);
@@ -1380,12 +1433,13 @@ match_expr(struct search_node_list *head, struct eventlog *evlog, bool last_matc
}
static int
list_session(char *log_dir, regex_t *re, const char *user, const char *tty)
list_session(struct sudo_lbuf *lbuf, char *log_dir, regex_t *re,
const char *user, const char *tty)
{
char idbuf[7], *idstr, *cp;
struct eventlog *evlog = NULL;
const char *timestr;
int ret = -1;
int i, ret = -1;
debug_decl(list_session, SUDO_DEBUG_UTIL);
if ((evlog = iolog_parse_loginfo(-1, log_dir)) == NULL)
@@ -1417,23 +1471,71 @@ list_session(char *log_dir, regex_t *re, const char *user, const char *tty)
}
/* XXX - print lines + cols? */
timestr = get_timestr(evlog->submit_time.tv_sec, 1);
printf("%s : %s : ", timestr ? timestr : "invalid date", evlog->submituser);
if (evlog->submithost != NULL)
printf("HOST=%s ; ", evlog->submithost);
if (evlog->ttyname != NULL)
printf("TTY=%s ; ", evlog->ttyname);
if (evlog->runchroot != NULL)
printf("CHROOT=%s ; ", evlog->runchroot);
if (evlog->runcwd != NULL || evlog->cwd != NULL)
printf("CWD=%s ; ", evlog->runcwd ? evlog->runcwd : evlog->cwd);
printf("USER=%s ; ", evlog->runuser);
if (evlog->rungroup != NULL)
printf("GROUP=%s ; ", evlog->rungroup);
printf("TSID=%s ; COMMAND=%s\n", idstr, evlog->command);
sudo_lbuf_append_esc(lbuf, LBUF_ESC_CNTRL, "%s : %s : ",
timestr ? timestr : "invalid date", evlog->submituser);
if (evlog->submithost != NULL) {
sudo_lbuf_append_esc(lbuf, LBUF_ESC_CNTRL, "HOST=%s ; ",
evlog->submithost);
}
if (evlog->ttyname != NULL) {
sudo_lbuf_append_esc(lbuf, LBUF_ESC_CNTRL, "TTY=%s ; ",
evlog->ttyname);
}
if (evlog->runchroot != NULL) {
sudo_lbuf_append_esc(lbuf, LBUF_ESC_CNTRL, "CHROOT=%s ; ",
evlog->runchroot);
}
if (evlog->runcwd != NULL || evlog->cwd != NULL) {
sudo_lbuf_append_esc(lbuf, LBUF_ESC_CNTRL, "CWD=%s ; ",
evlog->runcwd ? evlog->runcwd : evlog->cwd);
}
sudo_lbuf_append_esc(lbuf, LBUF_ESC_CNTRL, "USER=%s ; ", evlog->runuser);
if (evlog->rungroup != NULL) {
sudo_lbuf_append_esc(lbuf, LBUF_ESC_CNTRL, "GROUP=%s ; ",
evlog->rungroup);
}
sudo_lbuf_append_esc(lbuf, LBUF_ESC_CNTRL, "TSID=%s ; ", idstr);
ret = 0;
/*
* If we have both command and argv from info.json we can escape
* blanks in the the command and arguments. If all we have is a
* single string containing both the command and arguments we cannot.
*/
if (evlog->argv != NULL) {
/* Command plus argv from the info.json file. */
sudo_lbuf_append_esc(lbuf, LBUF_ESC_CNTRL|LBUF_ESC_BLANK,
"COMMAND=%s", evlog->command);
if (evlog->argv[0] != NULL) {
for (i = 1; evlog->argv[i] != NULL; i++) {
sudo_lbuf_append(lbuf, " ");
if (strchr(evlog->argv[i], ' ') != NULL) {
/* Wrap args containing spaces in single quotes. */
sudo_lbuf_append(lbuf, "'");
sudo_lbuf_append_esc(lbuf, LBUF_ESC_CNTRL|LBUF_ESC_QUOTE,
"%s", evlog->argv[i]);
sudo_lbuf_append(lbuf, "'");
} else {
/* Escape quotes here too for consistency. */
sudo_lbuf_append_esc(lbuf,
LBUF_ESC_CNTRL|LBUF_ESC_BLANK|LBUF_ESC_QUOTE,
"%s", evlog->argv[i]);
}
}
}
} else {
/* Single string from the legacy info file. */
sudo_lbuf_append_esc(lbuf, LBUF_ESC_CNTRL, "COMMAND=%s",
evlog->command);
}
if (!sudo_lbuf_error(lbuf)) {
puts(lbuf->buf);
ret = 0;
}
done:
lbuf->error = 0;
lbuf->len = 0;
eventlog_free(evlog);
debug_return_int(ret);
}
@@ -1453,6 +1555,7 @@ find_sessions(const char *dir, regex_t *re, const char *user, const char *tty)
DIR *d;
struct dirent *dp;
struct stat sb;
struct sudo_lbuf lbuf;
size_t sdlen, sessions_len = 0, sessions_size = 0;
unsigned int i;
int len;
@@ -1464,6 +1567,8 @@ find_sessions(const char *dir, regex_t *re, const char *user, const char *tty)
#endif
debug_decl(find_sessions, SUDO_DEBUG_UTIL);
sudo_lbuf_init(&lbuf, NULL, 0, NULL, 0);
d = opendir(dir);
if (d == NULL)
sudo_fatal(U_("unable to open %s"), dir);
@@ -1524,7 +1629,7 @@ find_sessions(const char *dir, regex_t *re, const char *user, const char *tty)
/* Check for dir with a log file. */
if (lstat(pathbuf, &sb) == 0 && S_ISREG(sb.st_mode)) {
pathbuf[sdlen + len - 4] = '\0';
list_session(pathbuf, re, user, tty);
list_session(&lbuf, pathbuf, re, user, tty);
} else {
/* Strip off "/log" and recurse if a non-log dir. */
pathbuf[sdlen + len - 4] = '\0';
@@ -1535,6 +1640,7 @@ find_sessions(const char *dir, regex_t *re, const char *user, const char *tty)
}
free(sessions);
}
sudo_lbuf_destroy(&lbuf);
debug_return_int(0);
}