*************************************************/
/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) The Exim maintainers 2020 */
/* See the file NOTICE for conditions of use and distribution. */
/* This module contains code for extracting addresses from a forwarding list
rda_exists(uschar *filename, uschar **error)
{
int rc, saved_errno;
-uschar *slash;
struct stat statbuf;
+uschar * s;
if ((rc = Ustat(filename, &statbuf)) >= 0) return FILE_EXIST;
saved_errno = errno;
-Ustrncpy(big_buffer, filename, big_buffer_size - 3);
+s = string_copy(filename);
sigalrm_seen = FALSE;
if (saved_errno == ENOENT)
{
- slash = Ustrrchr(big_buffer, '/');
- Ustrcpy(slash+1, ".");
+ uschar * slash = Ustrrchr(s, '/');
+ Ustrcpy(slash+1, US".");
ALARM(30);
- rc = Ustat(big_buffer, &statbuf);
+ rc = Ustat(s, &statbuf);
if (rc != 0 && errno == EACCES && !sigalrm_seen)
{
*slash = 0;
- rc = Ustat(big_buffer, &statbuf);
+ rc = Ustat(s, &statbuf);
}
saved_errno = errno;
ALARM_CLR(0);
- DEBUG(D_route) debug_printf("stat(%s)=%d\n", big_buffer, rc);
+ DEBUG(D_route) debug_printf("stat(%s)=%d\n", s, rc);
}
if (sigalrm_seen || rc != 0)
{
- *error = string_sprintf("failed to stat %s (%s)", big_buffer,
- sigalrm_seen? "timeout" : strerror(saved_errno));
+ *error = string_sprintf("failed to stat %s (%s)", s,
+ sigalrm_seen? "timeout" : strerror(saved_errno));
return FILE_EXIST_UNCLEAR;
}
BOOL gid_ok = !rdata->check_group;
struct stat statbuf;
+/* Reading a file is a form of expansion; we wish to deny attackers the
+capability to specify the file name. */
+
+if (is_tainted(filename))
+ {
+ *error = string_sprintf("Tainted name '%s' for file read not permitted\n",
+ filename);
+ *yield = FF_ERROR;
+ return NULL;
+ }
+
/* Attempt to open the file. If it appears not to exist, check up on the
containing directory by statting it. If the directory does not exist, we treat
this situation as an error (which will cause delivery to defer); otherwise we
path is not a directory" errors), the right behaviour seems to be not to do the
directory test. */
-fwd = Ufopen(filename, "rb");
-if (fwd == NULL)
+if (!(fwd = Ufopen(filename, "rb"))) switch(errno)
{
- switch(errno)
- {
- case ENOENT: /* File does not exist */
+ case ENOENT: /* File does not exist */
DEBUG(D_route) debug_printf("%s does not exist\n%schecking parent directory\n",
- filename,
- ((options & RDO_ENOTDIR) != 0)? "ignore_enotdir set => skip " : "");
- *yield = (((options & RDO_ENOTDIR) != 0) ||
- rda_exists(filename, error) == FILE_NOT_EXIST)?
- FF_NONEXIST : FF_ERROR;
+ filename, options & RDO_ENOTDIR ? "ignore_enotdir set => skip " : "");
+ *yield =
+ options & RDO_ENOTDIR || rda_exists(filename, error) == FILE_NOT_EXIST
+ ? FF_NONEXIST : FF_ERROR;
return NULL;
- case ENOTDIR: /* Something on the path isn't a directory */
- if ((options & RDO_ENOTDIR) == 0) goto DEFAULT_ERROR;
+ case ENOTDIR: /* Something on the path isn't a directory */
+ if (!(options & RDO_ENOTDIR)) goto DEFAULT_ERROR;
DEBUG(D_route) debug_printf("non-directory on path %s: file assumed not to "
"exist\n", filename);
*yield = FF_NONEXIST;
return NULL;
- case EACCES: /* Permission denied */
- if ((options & RDO_EACCES) == 0) goto DEFAULT_ERROR;
+ case EACCES: /* Permission denied */
+ if (!(options & RDO_EACCES)) goto DEFAULT_ERROR;
DEBUG(D_route) debug_printf("permission denied for %s: file assumed not to "
"exist\n", filename);
*yield = FF_NONEXIST;
return NULL;
- DEFAULT_ERROR:
- default:
+DEFAULT_ERROR:
+ default:
*error = string_open_failed(errno, "%s", filename);
*yield = FF_ERROR;
return NULL;
- }
}
/* Check that we have a regular file. */
/* Check the file owner and file group if required to do so. */
if (!uid_ok)
- {
- if (rdata->pw != NULL && statbuf.st_uid == rdata->pw->pw_uid)
+ if (rdata->pw && statbuf.st_uid == rdata->pw->pw_uid)
uid_ok = TRUE;
- else if (rdata->owners != NULL)
+ else if (rdata->owners)
for (int i = 1; i <= (int)(rdata->owners[0]); i++)
if (rdata->owners[i] == statbuf.st_uid) { uid_ok = TRUE; break; }
- }
if (!gid_ok)
- {
- if (rdata->pw != NULL && statbuf.st_gid == rdata->pw->pw_gid)
+ if (rdata->pw && statbuf.st_gid == rdata->pw->pw_gid)
gid_ok = TRUE;
- else if (rdata->owngroups != NULL)
+ else if (rdata->owngroups)
for (int i = 1; i <= (int)(rdata->owngroups[0]); i++)
if (rdata->owngroups[i] == statbuf.st_gid) { gid_ok = TRUE; break; }
- }
if (!uid_ok || !gid_ok)
{
/* Read the file in one go in order to minimize the time we have it open. */
-filebuf = store_get(statbuf.st_size + 1);
+filebuf = store_get(statbuf.st_size + 1, is_tainted(filename));
if (fread(filebuf, 1, statbuf.st_size, fwd) != statbuf.st_size)
{
}
filebuf[statbuf.st_size] = 0;
-DEBUG(D_route)
- debug_printf(OFF_T_FMT " bytes read from %s\n", statbuf.st_size, filename);
+DEBUG(D_route) debug_printf(OFF_T_FMT " %sbytes read from %s\n",
+ statbuf.st_size, is_tainted(filename) ? "(tainted) " : "", filename);
(void)fclose(fwd);
return filebuf;
if (rdata->isfile)
{
int yield = 0;
- data = rda_get_file_contents(rdata, options, error, &yield);
- if (data == NULL) return yield;
+ if (!(data = rda_get_file_contents(rdata, options, error, &yield)))
+ return yield;
}
else data = rdata->string;
int old_expand_forbid = expand_forbid;
DEBUG(D_route) debug_printf("data is %s filter program\n",
- (*filtertype == FILTER_EXIM)? "an Exim" : "a Sieve");
+ *filtertype == FILTER_EXIM ? "an Exim" : "a Sieve");
/* RDO_FILTER is an "allow" bit */
- if ((options & RDO_FILTER) == 0)
+ if (!(options & RDO_FILTER))
{
*error = US"filtering not enabled";
return FF_ERROR;
}
expand_forbid =
- (expand_forbid & ~RDO_FILTER_EXPANSIONS) |
- (options & RDO_FILTER_EXPANSIONS);
+ expand_forbid & ~RDO_FILTER_EXPANSIONS | options & RDO_FILTER_EXPANSIONS;
/* RDO_{EXIM,SIEVE}_FILTER are forbid bits */
}
else
{
- if ((options & RDO_SIEVE_FILTER) != 0)
+ if (options & RDO_SIEVE_FILTER)
{
*error = US"Sieve filtering not enabled";
return FF_ERROR;
else
/* We know we have enough memory so disable the error on "len" */
/* coverity[tainted_data] */
- if (read(fd, *sp = store_get(len), len) != len) return FALSE;
+ /* We trust the data source, so untainted */
+ if (read(fd, *sp = store_get(len, FALSE), len) != len) return FALSE;
return TRUE;
}
/* This function is passed a forward list string (unexpanded) or the name of a
file (unexpanded) whose contents are the forwarding list. The list may in fact
be a filter program if it starts with "#Exim filter" or "#Sieve filter". Other
-types of filter, with different inital tag strings, may be introduced in due
+types of filter, with different initial tag strings, may be introduced in due
course.
The job of the function is to process the forwarding list or filter. It is
uschar *readerror = US"";
void (*oldsignal)(int);
-DEBUG(D_route) debug_printf("rda_interpret (%s): %s\n",
- (rdata->isfile)? "file" : "string", rdata->string);
+DEBUG(D_route) debug_printf("rda_interpret (%s): '%s'\n",
+ rdata->isfile ? "file" : "string", string_printing(rdata->string));
/* Do the expansions of the file name or data first, while still privileged. */
-data = expand_string(rdata->string);
-if (data == NULL)
+if (!(data = expand_string(rdata->string)))
{
if (f.expand_string_forcedfail) return FF_NOTDELIVERED;
*error = string_sprintf("failed to expand \"%s\": %s", rdata->string,
}
rdata->string = data;
-DEBUG(D_route) debug_printf("expanded: %s\n", data);
+DEBUG(D_route)
+ debug_printf("expanded: '%s'%s\n", data, is_tainted(data) ? " (tainted)":"");
if (rdata->isfile && data[0] != '/')
{
(!rdata->isfile && /* We've got the data, and */
rda_is_filter(data) == FILTER_FORWARD && /* It's not a filter script, */
Ustrstr(data, ":include:") == NULL)) /* and there's no :include: */
- {
return rda_extract(rdata, options, include_directory,
sieve_vacation_directory, sieve_enotify_mailto_owner, sieve_useraddress,
sieve_subaddress, generated, error, eblockp, filtertype);
- }
/* We need to run the processing code in a sub-process. However, if we can
determine the non-existence of a file first, we can decline without having to
out:
(void)close(fd);
search_tidyup();
- _exit(0);
+ exim_underbar_exit(0);
bad:
DEBUG(D_rewrite) debug_printf("rda_interpret: failed write to pipe\n");
uschar *s;
if (!rda_read_string(fd, &s)) goto DISASTER;
if (!s) break;
- e = store_get(sizeof(error_block));
+ e = store_get(sizeof(error_block), FALSE);
e->next = NULL;
e->text1 = s;
if (!rda_read_string(fd, &s)) goto DISASTER;
/* First string is the address; NULL => end of addresses */
if (!rda_read_string(fd, &recipient)) goto DISASTER;
- if (recipient == NULL) break;
+ if (!recipient) break;
/* Hang on the end of the chain */
if (i > 0)
{
- addr->pipe_expandn = store_get((i+1) * sizeof(uschar *));
+ addr->pipe_expandn = store_get((i+1) * sizeof(uschar *), FALSE);
addr->pipe_expandn[i] = NULL;
while (--i >= 0) addr->pipe_expandn[i] = expandn[i];
}
if (read(fd, &reply_options, sizeof(int)) != sizeof(int)) goto DISASTER;
if ((reply_options & REPLY_EXISTS) != 0)
{
- addr->reply = store_get(sizeof(reply_item));
+ addr->reply = store_get(sizeof(reply_item), FALSE);
addr->reply->file_expand = (reply_options & REPLY_EXPAND) != 0;
addr->reply->return_message = (reply_options & REPLY_RETURN) != 0;
sizeof(int) ||
read(fd,&(addr->reply->once_repeat),sizeof(time_t)) !=
sizeof(time_t) ||
- !rda_read_string(fd, &(addr->reply->to)) ||
- !rda_read_string(fd, &(addr->reply->cc)) ||
- !rda_read_string(fd, &(addr->reply->bcc)) ||
- !rda_read_string(fd, &(addr->reply->from)) ||
- !rda_read_string(fd, &(addr->reply->reply_to)) ||
- !rda_read_string(fd, &(addr->reply->subject)) ||
- !rda_read_string(fd, &(addr->reply->headers)) ||
- !rda_read_string(fd, &(addr->reply->text)) ||
- !rda_read_string(fd, &(addr->reply->file)) ||
- !rda_read_string(fd, &(addr->reply->logfile)) ||
- !rda_read_string(fd, &(addr->reply->oncelog)))
+ !rda_read_string(fd, &addr->reply->to) ||
+ !rda_read_string(fd, &addr->reply->cc) ||
+ !rda_read_string(fd, &addr->reply->bcc) ||
+ !rda_read_string(fd, &addr->reply->from) ||
+ !rda_read_string(fd, &addr->reply->reply_to) ||
+ !rda_read_string(fd, &addr->reply->subject) ||
+ !rda_read_string(fd, &addr->reply->headers) ||
+ !rda_read_string(fd, &addr->reply->text) ||
+ !rda_read_string(fd, &addr->reply->file) ||
+ !rda_read_string(fd, &addr->reply->logfile) ||
+ !rda_read_string(fd, &addr->reply->oncelog))
goto DISASTER;
}
}
WAIT_EXIT:
while ((rc = wait(&status)) != pid)
- {
if (rc < 0 && errno == ECHILD) /* Process has vanished */
{
log_write(0, LOG_MAIN, "redirection process %d vanished unexpectedly", pid);
goto FINAL_EXIT;
}
- }
DEBUG(D_route)
debug_printf("rda_interpret: subprocess yield=%d error=%s\n", yield, *error);
projects / exim.git / blobdiff