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Fix conflict resolution logic for `read_only` and `hide_passwords` flags 

For one of these flags to be in effect for a cipher, upstream requires all of
(rather than any of) the collections the cipher is in to have that flag set.

Also, some of the logic for loading access restrictions was wrong. I think
that only malicious clients that also had knowledge of the UUIDs of ciphers
they didn't have access to would have been able to take advantage of that.
This commit is contained in:
Jeremy Lin 2021-10-29 11:45:43 -07:00
parent a2316ca091
commit 6cbb724069
1 changed files with 24 additions and 21 deletions
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45
src/db/models/cipher.rs
View File

@ -343,36 +343,39 @@ impl Cipher {
db_run! {conn: {
// Check whether this cipher is in any collections accessible to the
// user. If so, retrieve the access flags for each collection.
let query = ciphers::table
let rows = ciphers::table
.filter(ciphers::uuid.eq(&self.uuid))
.inner_join(ciphers_collections::table.on(
ciphers::uuid.eq(ciphers_collections::cipher_uuid)))
.inner_join(users_collections::table.on(
ciphers_collections::collection_uuid.eq(users_collections::collection_uuid)
.and(users_collections::user_uuid.eq(user_uuid))))
.select((users_collections::read_only, users_collections::hide_passwords));
.select((users_collections::read_only, users_collections::hide_passwords))
.load::<(bool, bool)>(conn)
.expect("Error getting access restrictions");
// There's an edge case where a cipher can be in multiple collections
// with inconsistent access flags. For example, a cipher could be in
// one collection where the user has read-only access, but also in
// another collection where the user has read/write access. To handle
// this, we do a boolean OR of all values in each of the `read_only`
// and `hide_passwords` columns. This could ideally be done as part
// of the query, but Diesel doesn't support a max() or bool_or()
// function on booleans and this behavior isn't portable anyway.
if let Ok(vec) = query.load::<(bool, bool)>(conn) {
let mut read_only = false;
let mut hide_passwords = false;
for (ro, hp) in vec.iter() {
read_only |= ro;
hide_passwords |= hp;
}
Some((read_only, hide_passwords))
} else {
if rows.is_empty() {
// This cipher isn't in any collections accessible to the user.
None
return None;
}
// A cipher can be in multiple collections with inconsistent access flags.
// For example, a cipher could be in one collection where the user has
// read-only access, but also in another collection where the user has
// read/write access. For a flag to be in effect for a cipher, upstream
// requires all collections the cipher is in to have that flag set.
// Therefore, we do a boolean AND of all values in each of the `read_only`
// and `hide_passwords` columns. This could ideally be done as part of the
// query, but Diesel doesn't support a min() or bool_and() function on
// booleans and this behavior isn't portable anyway.
let mut read_only = true;
let mut hide_passwords = true;
for (ro, hp) in rows.iter() {
read_only &= ro;
hide_passwords &= hp;
}
Some((read_only, hide_passwords))
}}
}