From 3cee2eec9c2849bf1148b5d51b5e7147e97b0b55 Mon Sep 17 00:00:00 2001 From: Steve French Date: Thu, 19 Sep 2019 04:00:55 -0500 Subject: [PATCH] smb3: allow decryption keys to be dumped by admin for debugging In order to debug certain problems it is important to be able to decrypt network traces (e.g. wireshark) but to do this we need to be able to dump out the encryption/decryption keys. Dumping them to an ioctl is safer than dumping then to dmesg, (and better than showing all keys in a pseudofile). Restrict this to root (CAP_SYS_ADMIN), and only for a mount that this admin has access to. Sample smbinfo output: SMB3.0 encryption Session Id: 0x82d2ec52 Session Key: a5 6d 81 d0 e c1 ca e1 d8 13 aa 20 e8 f2 cc 71 Server Encryption Key: 1a c3 be ba 3d fc dc 3c e bc 93 9e 50 9e 19 c1 Server Decryption Key: e0 d4 d9 43 1b a2 1b e3 d8 76 77 49 56 f7 20 88 Reviewed-by: Aurelien Aptel Signed-off-by: Steve French --- fs/cifs/cifs_ioctl.h | 9 +++++++++ fs/cifs/ioctl.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 38 insertions(+) diff --git a/fs/cifs/cifs_ioctl.h b/fs/cifs/cifs_ioctl.h index 6c3bd07868d7..0f0dc1c1fe41 100644 --- a/fs/cifs/cifs_ioctl.h +++ b/fs/cifs/cifs_ioctl.h @@ -57,9 +57,18 @@ struct smb_query_info { /* char buffer[]; */ } __packed; +struct smb3_key_debug_info { + __u64 Suid; + __u16 cipher_type; + __u8 auth_key[16]; /* SMB2_NTLMV2_SESSKEY_SIZE */ + __u8 smb3encryptionkey[SMB3_SIGN_KEY_SIZE]; + __u8 smb3decryptionkey[SMB3_SIGN_KEY_SIZE]; +} __packed; + #define CIFS_IOCTL_MAGIC 0xCF #define CIFS_IOC_COPYCHUNK_FILE _IOW(CIFS_IOCTL_MAGIC, 3, int) #define CIFS_IOC_SET_INTEGRITY _IO(CIFS_IOCTL_MAGIC, 4) #define CIFS_IOC_GET_MNT_INFO _IOR(CIFS_IOCTL_MAGIC, 5, struct smb_mnt_fs_info) #define CIFS_ENUMERATE_SNAPSHOTS _IOR(CIFS_IOCTL_MAGIC, 6, struct smb_snapshot_array) #define CIFS_QUERY_INFO _IOWR(CIFS_IOCTL_MAGIC, 7, struct smb_query_info) +#define CIFS_DUMP_KEY _IOWR(CIFS_IOCTL_MAGIC, 8, struct smb3_key_debug_info) diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c index 76ddd98b6298..48c23929350c 100644 --- a/fs/cifs/ioctl.c +++ b/fs/cifs/ioctl.c @@ -164,6 +164,7 @@ static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon, long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) { struct inode *inode = file_inode(filep); + struct smb3_key_debug_info pkey_inf; int rc = -ENOTTY; /* strange error - but the precedent */ unsigned int xid; struct cifsFileInfo *pSMBFile = filep->private_data; @@ -270,6 +271,34 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) else rc = -EOPNOTSUPP; break; + case CIFS_DUMP_KEY: + cifs_dbg(VFS, "ioctl dumpkey\n"); /* BB REMOVEME */ + if (pSMBFile == NULL) + break; + if (!capable(CAP_SYS_ADMIN)) { + rc = -EACCES; + break; + } + tcon = tlink_tcon(pSMBFile->tlink); + if (!smb3_encryption_required(tcon)) { + rc = -EOPNOTSUPP; + break; + } + pkey_inf.cipher_type = + le16_to_cpu(tcon->ses->server->cipher_type); + pkey_inf.Suid = tcon->ses->Suid; + memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response, + 16 /* SMB2_NTLMV2_SESSKEY_SIZE */); + memcpy(pkey_inf.smb3decryptionkey, + tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE); + memcpy(pkey_inf.smb3encryptionkey, + tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE); + if (copy_to_user((void __user *)arg, &pkey_inf, + sizeof(struct smb3_key_debug_info))) + rc = -EFAULT; + else + rc = 0; + break; default: cifs_dbg(FYI, "unsupported ioctl\n"); break; -- 2.20.1