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https://github.com/RGBCube/serenity
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Kernel: Add Credentials to hold a set of user and group IDs
This patch adds a new object to hold a Process's user credentials: - UID, EUID, SUID - GID, EGID, SGID, extra GIDs Credentials are immutable and child processes initially inherit the Credentials object from their parent. Whenever a process changes one or more of its user/group IDs, a new Credentials object is constructed. Any code that wants to inspect and act on a set of credentials can now do so without worrying about data races.
This commit is contained in:
Andreas Kling
parent
bec314611d
commit
122d7d9533
11 changed files with 366 additions and 128 deletions
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@ -16,15 +16,26 @@ ErrorOr<FlatPtr> Process::sys$seteuid(UserID new_euid)
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if (new_euid == (uid_t)-1)
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return EINVAL;
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if (new_euid != uid() && new_euid != suid() && !is_superuser())
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auto credentials = this->credentials();
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if (new_euid != credentials->uid() && new_euid != credentials->suid() && !credentials->is_superuser())
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return EPERM;
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if (euid() != new_euid)
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set_dumpable(false);
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auto new_credentials = TRY(Credentials::create(
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credentials->uid(),
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credentials->gid(),
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new_euid,
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credentials->egid(),
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credentials->suid(),
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credentials->sgid(),
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credentials->extra_gids()));
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ProtectedDataMutationScope scope { *this };
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m_protected_values.euid = new_euid;
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if (credentials->euid() != new_euid)
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set_dumpable(false);
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m_protected_values.credentials = move(new_credentials);
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return 0;
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}
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@ -36,14 +47,26 @@ ErrorOr<FlatPtr> Process::sys$setegid(GroupID new_egid)
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if (new_egid == (uid_t)-1)
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return EINVAL;
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if (new_egid != gid() && new_egid != sgid() && !is_superuser())
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auto credentials = this->credentials();
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if (new_egid != credentials->gid() && new_egid != credentials->sgid() && !credentials->is_superuser())
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return EPERM;
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if (egid() != new_egid)
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set_dumpable(false);
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auto new_credentials = TRY(Credentials::create(
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credentials->uid(),
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credentials->gid(),
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credentials->euid(),
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new_egid,
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credentials->suid(),
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credentials->sgid(),
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credentials->extra_gids()));
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ProtectedDataMutationScope scope { *this };
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m_protected_values.egid = new_egid;
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if (credentials->egid() != new_egid)
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set_dumpable(false);
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m_protected_values.credentials = move(new_credentials);
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return 0;
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}
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@ -55,16 +78,26 @@ ErrorOr<FlatPtr> Process::sys$setuid(UserID new_uid)
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if (new_uid == (uid_t)-1)
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return EINVAL;
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if (new_uid != uid() && new_uid != euid() && !is_superuser())
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auto credentials = this->credentials();
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if (new_uid != credentials->uid() && new_uid != credentials->euid() && !credentials->is_superuser())
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return EPERM;
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if (euid() != new_uid)
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set_dumpable(false);
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auto new_credentials = TRY(Credentials::create(
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new_uid,
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credentials->gid(),
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new_uid,
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credentials->egid(),
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new_uid,
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credentials->sgid(),
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credentials->extra_gids()));
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ProtectedDataMutationScope scope { *this };
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m_protected_values.uid = new_uid;
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m_protected_values.euid = new_uid;
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m_protected_values.suid = new_uid;
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if (credentials->euid() != new_uid)
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set_dumpable(false);
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m_protected_values.credentials = move(new_credentials);
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return 0;
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}
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@ -76,16 +109,26 @@ ErrorOr<FlatPtr> Process::sys$setgid(GroupID new_gid)
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if (new_gid == (uid_t)-1)
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return EINVAL;
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if (new_gid != gid() && new_gid != egid() && !is_superuser())
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auto credentials = this->credentials();
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if (new_gid != credentials->gid() && new_gid != credentials->egid() && !credentials->is_superuser())
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return EPERM;
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if (egid() != new_gid)
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set_dumpable(false);
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auto new_credentials = TRY(Credentials::create(
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credentials->uid(),
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new_gid,
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credentials->euid(),
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new_gid,
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credentials->suid(),
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new_gid,
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credentials->extra_gids()));
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ProtectedDataMutationScope scope { *this };
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m_protected_values.gid = new_gid;
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m_protected_values.egid = new_gid;
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m_protected_values.sgid = new_gid;
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if (credentials->egid() != new_gid)
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set_dumpable(false);
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m_protected_values.credentials = move(new_credentials);
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return 0;
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}
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@ -94,24 +137,35 @@ ErrorOr<FlatPtr> Process::sys$setreuid(UserID new_ruid, UserID new_euid)
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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TRY(require_promise(Pledge::id));
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if (new_ruid == (uid_t)-1)
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new_ruid = uid();
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if (new_euid == (uid_t)-1)
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new_euid = euid();
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auto credentials = this->credentials();
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auto ok = [this](UserID id) { return id == uid() || id == euid() || id == suid(); };
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if (new_ruid == (uid_t)-1)
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new_ruid = credentials->uid();
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if (new_euid == (uid_t)-1)
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new_euid = credentials->euid();
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auto ok = [&credentials](UserID id) { return id == credentials->uid() || id == credentials->euid() || id == credentials->suid(); };
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if (!ok(new_ruid) || !ok(new_euid))
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return EPERM;
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if (new_ruid < (uid_t)-1 || new_euid < (uid_t)-1)
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return EINVAL;
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if (euid() != new_euid)
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set_dumpable(false);
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auto new_credentials = TRY(Credentials::create(
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new_ruid,
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credentials->gid(),
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new_euid,
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credentials->egid(),
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credentials->suid(),
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credentials->sgid(),
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credentials->extra_gids()));
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ProtectedDataMutationScope scope { *this };
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m_protected_values.uid = new_ruid;
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m_protected_values.euid = new_euid;
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if (credentials->euid() != new_euid)
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set_dumpable(false);
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m_protected_values.credentials = move(new_credentials);
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return 0;
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}
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@ -120,24 +174,34 @@ ErrorOr<FlatPtr> Process::sys$setresuid(UserID new_ruid, UserID new_euid, UserID
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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TRY(require_promise(Pledge::id));
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if (new_ruid == (uid_t)-1)
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new_ruid = uid();
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if (new_euid == (uid_t)-1)
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new_euid = euid();
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if (new_suid == (uid_t)-1)
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new_suid = suid();
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auto credentials = this->credentials();
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auto ok = [this](UserID id) { return id == uid() || id == euid() || id == suid(); };
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if ((!ok(new_ruid) || !ok(new_euid) || !ok(new_suid)) && !is_superuser())
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if (new_ruid == (uid_t)-1)
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new_ruid = credentials->uid();
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if (new_euid == (uid_t)-1)
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new_euid = credentials->euid();
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if (new_suid == (uid_t)-1)
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new_suid = credentials->suid();
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auto ok = [&credentials](UserID id) { return id == credentials->uid() || id == credentials->euid() || id == credentials->suid(); };
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if ((!ok(new_ruid) || !ok(new_euid) || !ok(new_suid)) && !credentials->is_superuser())
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return EPERM;
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if (euid() != new_euid)
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set_dumpable(false);
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auto new_credentials = TRY(Credentials::create(
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new_ruid,
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credentials->gid(),
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new_euid,
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credentials->egid(),
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new_suid,
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credentials->sgid(),
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credentials->extra_gids()));
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ProtectedDataMutationScope scope { *this };
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m_protected_values.uid = new_ruid;
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m_protected_values.euid = new_euid;
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m_protected_values.suid = new_suid;
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if (credentials->euid() != new_euid)
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set_dumpable(false);
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m_protected_values.credentials = move(new_credentials);
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return 0;
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}
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@ -146,58 +210,84 @@ ErrorOr<FlatPtr> Process::sys$setresgid(GroupID new_rgid, GroupID new_egid, Grou
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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TRY(require_promise(Pledge::id));
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if (new_rgid == (gid_t)-1)
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new_rgid = gid();
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if (new_egid == (gid_t)-1)
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new_egid = egid();
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if (new_sgid == (gid_t)-1)
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new_sgid = sgid();
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auto credentials = this->credentials();
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auto ok = [this](GroupID id) { return id == gid() || id == egid() || id == sgid(); };
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if ((!ok(new_rgid) || !ok(new_egid) || !ok(new_sgid)) && !is_superuser())
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if (new_rgid == (gid_t)-1)
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new_rgid = credentials->gid();
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if (new_egid == (gid_t)-1)
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new_egid = credentials->egid();
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if (new_sgid == (gid_t)-1)
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new_sgid = credentials->sgid();
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auto ok = [&credentials](GroupID id) { return id == credentials->gid() || id == credentials->egid() || id == credentials->sgid(); };
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if ((!ok(new_rgid) || !ok(new_egid) || !ok(new_sgid)) && !credentials->is_superuser())
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return EPERM;
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if (egid() != new_egid)
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set_dumpable(false);
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auto new_credentials = TRY(Credentials::create(
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credentials->uid(),
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new_rgid,
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credentials->euid(),
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new_egid,
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credentials->suid(),
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new_sgid,
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credentials->extra_gids()));
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ProtectedDataMutationScope scope { *this };
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m_protected_values.gid = new_rgid;
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m_protected_values.egid = new_egid;
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m_protected_values.sgid = new_sgid;
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if (credentials->egid() != new_egid)
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set_dumpable(false);
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m_protected_values.credentials = move(new_credentials);
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$setgroups(size_t count, Userspace<gid_t const*> user_gids)
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ErrorOr<FlatPtr> Process::sys$setgroups(size_t count, Userspace<GroupID const*> user_gids)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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TRY(require_promise(Pledge::id));
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if (!is_superuser())
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auto credentials = this->credentials();
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if (!credentials->is_superuser())
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return EPERM;
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if (!count) {
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ProtectedDataMutationScope scope { *this };
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m_protected_values.extra_gids.clear();
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m_protected_values.credentials = TRY(Credentials::create(
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credentials->uid(),
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credentials->gid(),
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credentials->euid(),
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credentials->egid(),
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credentials->suid(),
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credentials->sgid(),
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{}));
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return 0;
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}
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Vector<gid_t> new_extra_gids;
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Vector<GroupID> new_extra_gids;
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TRY(new_extra_gids.try_resize(count));
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TRY(copy_n_from_user(new_extra_gids.data(), user_gids, count));
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HashTable<gid_t> unique_extra_gids;
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HashTable<GroupID> unique_extra_gids;
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for (auto& extra_gid : new_extra_gids) {
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if (extra_gid != gid())
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TRY(unique_extra_gids.try_set(extra_gid));
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}
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ProtectedDataMutationScope scope { *this };
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TRY(m_protected_values.extra_gids.try_resize(unique_extra_gids.size()));
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size_t i = 0;
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for (auto& extra_gid : unique_extra_gids) {
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if (extra_gid == gid())
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continue;
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m_protected_values.extra_gids[i++] = extra_gid;
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new_extra_gids.clear_with_capacity();
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for (auto extra_gid : unique_extra_gids) {
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TRY(new_extra_gids.try_append(extra_gid));
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}
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ProtectedDataMutationScope scope { *this };
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m_protected_values.credentials = TRY(Credentials::create(
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credentials->uid(),
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credentials->gid(),
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credentials->euid(),
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credentials->egid(),
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credentials->suid(),
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credentials->sgid(),
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new_extra_gids.span()));
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return 0;
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}
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