smb3: fix broken reconnect when password changing on the server by allowing password rotation

There are various use cases that are becoming more common in which password
changes are scheduled on a server(s) periodically but the clients connected
to this server need to stay connected (even in the face of brief network
reconnects) due to mounts which can not be easily unmounted and mounted at
will, and servers that do password rotation do not always have the ability
to tell the clients exactly when to the new password will be effective,
so add support for an alt password ("password2=") on mount (and also
remount) so that we can anticipate the upcoming change to the server
without risking breaking existing mounts.

An alternative would have been to use the kernel keyring for this but the
processes doing the reconnect do not have access to the keyring but do
have access to the ses structure.

Reviewed-by: Bharath SM <bharathsm@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

6 files changed, 44 insertions, 0 deletions

diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h
index f6a302205f89c4..d6669ce4ae87f0 100644
--- a/fs/smb/client/cifsglob.h
+++ b/fs/smb/client/cifsglob.h
@@ -1077,6 +1077,7 @@ struct cifs_ses {
 				   and after mount option parsing we fill it */
 	char *domainName;
 	char *password;
+	char *password2; /* When key rotation used, new password may be set before it expires */
 	char workstation_name[CIFS_MAX_WORKSTATION_LEN];
 	struct session_key auth_key;
 	struct ntlmssp_auth *ntlmssp; /* ciphertext, flags, server challenge */
diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c
index 85679ae106fd50..4e35970681bf05 100644
--- a/fs/smb/client/connect.c
+++ b/fs/smb/client/connect.c
@@ -2183,6 +2183,7 @@ cifs_set_cifscreds(struct smb3_fs_context *ctx, struct cifs_ses *ses)
 	}
 
 	++delim;
+	/* BB consider adding support for password2 (Key Rotation) for multiuser in future */
 	ctx->password = kstrndup(delim, len, GFP_KERNEL);
 	if (!ctx->password) {
 		cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
@@ -2206,6 +2207,7 @@ cifs_set_cifscreds(struct smb3_fs_context *ctx, struct cifs_ses *ses)
 			kfree(ctx->username);
 			ctx->username = NULL;
 			kfree_sensitive(ctx->password);
+			/* no need to free ctx->password2 since not allocated in this path */
 			ctx->password = NULL;
 			goto out_key_put;
 		}
@@ -2317,6 +2319,12 @@ cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
 		if (!ses->password)
 			goto get_ses_fail;
 	}
+	/* ctx->password freed at unmount */
+	if (ctx->password2) {
+		ses->password2 = kstrdup(ctx->password2, GFP_KERNEL);
+		if (!ses->password2)
+			goto get_ses_fail;
+	}
 	if (ctx->domainname) {
 		ses->domainName = kstrdup(ctx->domainname, GFP_KERNEL);
 		if (!ses->domainName)
diff --git a/fs/smb/client/fs_context.c b/fs/smb/client/fs_context.c
index b7bfe705b2c498..6c727d8c31e870 100644
--- a/fs/smb/client/fs_context.c
+++ b/fs/smb/client/fs_context.c
@@ -162,6 +162,7 @@ const struct fs_parameter_spec smb3_fs_parameters[] = {
 	fsparam_string("username", Opt_user),
 	fsparam_string("pass", Opt_pass),
 	fsparam_string("password", Opt_pass),
+	fsparam_string("password2", Opt_pass2),
 	fsparam_string("ip", Opt_ip),
 	fsparam_string("addr", Opt_ip),
 	fsparam_string("domain", Opt_domain),
@@ -345,6 +346,7 @@ smb3_fs_context_dup(struct smb3_fs_context *new_ctx, struct smb3_fs_context *ctx
 	new_ctx->nodename = NULL;
 	new_ctx->username = NULL;
 	new_ctx->password = NULL;
+	new_ctx->password2 = NULL;
 	new_ctx->server_hostname = NULL;
 	new_ctx->domainname = NULL;
 	new_ctx->UNC = NULL;
@@ -357,6 +359,7 @@ smb3_fs_context_dup(struct smb3_fs_context *new_ctx, struct smb3_fs_context *ctx
 	DUP_CTX_STR(prepath);
 	DUP_CTX_STR(username);
 	DUP_CTX_STR(password);
+	DUP_CTX_STR(password2);
 	DUP_CTX_STR(server_hostname);
 	DUP_CTX_STR(UNC);
 	DUP_CTX_STR(source);
@@ -905,6 +908,8 @@ static int smb3_reconfigure(struct fs_context *fc)
 	else  {
 		kfree_sensitive(ses->password);
 		ses->password = kstrdup(ctx->password, GFP_KERNEL);
+		kfree_sensitive(ses->password2);
+		ses->password2 = kstrdup(ctx->password2, GFP_KERNEL);
 	}
 	STEAL_STRING(cifs_sb, ctx, domainname);
 	STEAL_STRING(cifs_sb, ctx, nodename);
@@ -1305,6 +1310,18 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
 			goto cifs_parse_mount_err;
 		}
 		break;
+	case Opt_pass2:
+		kfree_sensitive(ctx->password2);
+		ctx->password2 = NULL;
+		if (strlen(param->string) == 0)
+			break;
+
+		ctx->password2 = kstrdup(param->string, GFP_KERNEL);
+		if (ctx->password2 == NULL) {
+			cifs_errorf(fc, "OOM when copying password2 string\n");
+			goto cifs_parse_mount_err;
+		}
+		break;
 	case Opt_ip:
 		if (strlen(param->string) == 0) {
 			ctx->got_ip = false;
@@ -1608,6 +1625,8 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
  cifs_parse_mount_err:
 	kfree_sensitive(ctx->password);
 	ctx->password = NULL;
+	kfree_sensitive(ctx->password2);
+	ctx->password2 = NULL;
 	return -EINVAL;
 }
 
@@ -1713,6 +1732,8 @@ smb3_cleanup_fs_context_contents(struct smb3_fs_context *ctx)
 	ctx->username = NULL;
 	kfree_sensitive(ctx->password);
 	ctx->password = NULL;
+	kfree_sensitive(ctx->password2);
+	ctx->password2 = NULL;
 	kfree(ctx->server_hostname);
 	ctx->server_hostname = NULL;
 	kfree(ctx->UNC);
diff --git a/fs/smb/client/fs_context.h b/fs/smb/client/fs_context.h
index 8a35645e0b65b2..a947bddeba273e 100644
--- a/fs/smb/client/fs_context.h
+++ b/fs/smb/client/fs_context.h
@@ -145,6 +145,7 @@ enum cifs_param {
 	Opt_source,
 	Opt_user,
 	Opt_pass,
+	Opt_pass2,
 	Opt_ip,
 	Opt_domain,
 	Opt_srcaddr,
@@ -177,6 +178,7 @@ struct smb3_fs_context {
 
 	char *username;
 	char *password;
+	char *password2;
 	char *domainname;
 	char *source;
 	char *server_hostname;
diff --git a/fs/smb/client/misc.c b/fs/smb/client/misc.c
index 33ac4f8f5050c4..7d15a1969b8184 100644
--- a/fs/smb/client/misc.c
+++ b/fs/smb/client/misc.c
@@ -98,6 +98,7 @@ sesInfoFree(struct cifs_ses *buf_to_free)
 	kfree(buf_to_free->serverDomain);
 	kfree(buf_to_free->serverNOS);
 	kfree_sensitive(buf_to_free->password);
+	kfree_sensitive(buf_to_free->password2);
 	kfree(buf_to_free->user_name);
 	kfree(buf_to_free->domainName);
 	kfree_sensitive(buf_to_free->auth_key.response);
diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c
index c0c4933af5fc38..86c647a947ccd1 100644
--- a/fs/smb/client/smb2pdu.c
+++ b/fs/smb/client/smb2pdu.c
@@ -367,6 +367,17 @@ again:
 		}
 
 		rc = cifs_setup_session(0, ses, server, nls_codepage);
+		if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {
+			/*
+			 * Try alternate password for next reconnect (key rotation
+			 * could be enabled on the server e.g.) if an alternate
+			 * password is available and the current password is expired,
+			 * but do not swap on non pwd related errors like host down
+			 */
+			if (ses->password2)
+				swap(ses->password2, ses->password);
+		}
+
 		if ((rc == -EACCES) && !tcon->retry) {
 			mutex_unlock(&ses->session_mutex);
 			rc = -EHOSTDOWN;