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#include "common.h"
#include "send.h"
static String*
mboxpath(char *path, char *user, String *to)
{
char buf[Pathlen];
mboxpathbuf(buf, sizeof buf, user, path);
return s_append(to, buf);
}
static void
mboxfile(dest *dp, String *user, String *path, char *file)
{
char *cp;
mboxpath(s_to_c(user), s_to_c(dp->addr), path);
cp = strrchr(s_to_c(path), '/');
if(cp)
path->ptr = cp+1;
else
path->ptr = path->base;
s_append(path, file);
}
/*
* BOTCH, BOTCH
* the problem is that we don't want to say a user exists
* just because the user has a mail box directory. that
* precludes using mode bits to disable mailboxes.
*
* botch #1: we pretend like we know that there must be a
* corresponding file or directory /mail/box/$user[/folder]/mbox
* this is wrong, but we get away with this for local mail boxes.
*
* botch #2: since the file server and not the auth server owns
* groups, it's not possible to get groups right. this means that
* a mailbox that only allows members of a group to post but
* not read wouldn't work.
*/
static uint accesstx[] = {
[OREAD] 1<<2,
[OWRITE] 1<<1,
[ORDWR] 3<<1,
[OEXEC] 1<<0
};
static int
accessmbox(char *f, int m)
{
int r, n;
Dir *d;
d = dirstat(f);
if(d == nil)
return -1;
n = 0;
if(m < nelem(accesstx))
n = accesstx[m];
if(d->mode & DMDIR)
n |= OEXEC;
r = (d->mode & n<<0) == n<<0;
// if(r == 0 && inlist(mygids(), d->gid) == 0)
// r = (d->mode & n<<3) == n<<3;
if(r == 0 && strcmp(getlog(), d->uid) == 0)
r = (d->mode & n<<6) == n<<6;
r--;
free(d);
return r;
}
/*
* Check forwarding requests
*/
extern dest*
expand_local(dest *dp)
{
Biobuf *fp;
String *file, *line, *s;
dest *rv;
int forwardok;
char *user;
/* short circuit obvious security problems */
if(strstr(s_to_c(dp->addr), "/../")){
dp->status = d_unknown;
return 0;
}
/* isolate user's name if part of a path */
user = strrchr(s_to_c(dp->addr), '!');
if(user)
user++;
else
user = s_to_c(dp->addr);
/* if no replacement string, plug in user's name */
if(dp->repl1 == 0){
dp->repl1 = s_new();
mboxpath("mbox", user, dp->repl1);
}
s = unescapespecial(s_clone(dp->repl1));
/*
* if this is the descendant of a `forward' file, don't
* look for a forward.
*/
forwardok = 1;
for(rv = dp->parent; rv; rv = rv->parent)
if(rv->status == d_cat){
forwardok = 0;
break;
}
file = s_new();
if(forwardok){
/*
* look for `forward' file for forwarding address(es)
*/
mboxfile(dp, s, file, "forward");
fp = sysopen(s_to_c(file), "r", 0);
if (fp != 0) {
line = s_new();
for(;;){
if(s_read_line(fp, line) == nil)
break;
if(*(line->ptr - 1) != '\n')
break;
if(*(line->ptr - 2) == '\\')
*(line->ptr-2) = ' ';
*(line->ptr-1) = ' ';
}
sysclose(fp);
if(debug)
fprint(2, "forward = %s\n", s_to_c(line));
rv = s_to_dest(s_restart(line), dp);
s_free(line);
if(rv){
s_free(file);
s_free(s);
return rv;
}
}
}
/*
* look for a 'pipe' file. This won't work if there are
* special characters in the account name since the file
* name passes through a shell. tdb.
*/
mboxfile(dp, dp->repl1, s_reset(file), "pipeto");
if(access(s_to_c(file), AEXEC) == 0){
if(debug)
fprint(2, "found a pipeto file\n");
dp->status = d_pipeto;
line = s_new();
s_append(line, "upasname='");
s_append(line, user);
s_append(line, "' ");
s_append(line, s_to_c(file));
s_append(line, " ");
s_append(line, s_to_c(dp->addr));
s_append(line, " ");
s_append(line, s_to_c(dp->repl1));
s_free(dp->repl1);
dp->repl1 = line;
s_free(file);
s_free(s);
return dp;
}
/*
* see if the mailbox directory exists
*/
mboxfile(dp, s, s_reset(file), "mbox");
if(accessmbox(s_to_c(file), OWRITE) != -1)
dp->status = d_cat;
else
dp->status = d_unknown;
s_free(file);
s_free(s);
return 0;
}
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