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[Security] Add challenge-response auth with scrypt verifiers and stop storing plaintext passwords

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Challenge-response authentication: the client derives a scrypt verifier
(RFC 7914, EVP_PBE_scrypt, N=32768, r=8, p=1) and authenticates with
HMAC-SHA256(key, nonce), so neither the password nor its hash is
transmitted. The stored format becomes
"$scrypt$<n>$<r>$<p>$<salt>$<verifier>" and Response_PasswordSalt
now carries the cost parameters. Strict servers only accept scrypt
verifiers; legacy accounts are migrated after a successful login.

Fix #344 for challenge-response servers: a saved profile stores the
derived verifier under the password key instead of the plaintext password.
The connect dialog loads it without revealing it, autoconnect passes it
through, the change-password dialog no longer prefills the old password
field with it, and the client only persists the verifier when
"Save password" is checked.

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This commit is contained in:
Lukas Brübach 2026-08-04 11:36:10 +02:00 • committed by GitHub
parent 048fe247f4
commit 709233d977
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33 changed files with 834 additions and 30 deletions
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4
servatrice/src/servatrice_database_interface.h
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@ -13,7 +13,7 @@
#include <server.h>
#include <server_database_interface.h>
#define DATABASE_SCHEMA_VERSION 36
#define DATABASE_SCHEMA_VERSION 37
class Servatrice;
@ -65,6 +65,8 @@ public:
bool activeUserExists(const QString &user) override;
bool userExists(const QString &user) override;
QString getUserSalt(const QString &user) override;
QString getUserPasswordData(const QString &user) override;
bool submitPasswordVerifier(const QString &user, const QString &passwordVerifier) override;
int getUserIdInDB(const QString &name);
QMap<QString, ServerInfo_User> getBuddyList(const QString &name) override;
QMap<QString, ServerInfo_User> getIgnoreList(const QString &name) override;