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-rw-r--r--src/lib-imap-urlauth/Makefile.am29
-rw-r--r--src/lib-imap-urlauth/Makefile.in835
-rw-r--r--src/lib-imap-urlauth/imap-urlauth-backend.c174
-rw-r--r--src/lib-imap-urlauth/imap-urlauth-backend.h16
-rw-r--r--src/lib-imap-urlauth/imap-urlauth-connection.c1027
-rw-r--r--src/lib-imap-urlauth/imap-urlauth-connection.h42
-rw-r--r--src/lib-imap-urlauth/imap-urlauth-fetch.c530
-rw-r--r--src/lib-imap-urlauth/imap-urlauth-fetch.h56
-rw-r--r--src/lib-imap-urlauth/imap-urlauth-private.h20
-rw-r--r--src/lib-imap-urlauth/imap-urlauth.c486
-rw-r--r--src/lib-imap-urlauth/imap-urlauth.h55
11 files changed, 3270 insertions, 0 deletions
diff --git a/src/lib-imap-urlauth/Makefile.am b/src/lib-imap-urlauth/Makefile.am
new file mode 100644
index 0000000..6734b72
--- /dev/null
+++ b/src/lib-imap-urlauth/Makefile.am
@@ -0,0 +1,29 @@
+noinst_LTLIBRARIES = libimap-urlauth.la
+
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+ -I$(top_srcdir)/src/lib-mail \
+ -I$(top_srcdir)/src/lib-index \
+ -I$(top_srcdir)/src/lib-storage \
+ -I$(top_srcdir)/src/lib-imap \
+ -I$(top_srcdir)/src/lib-imap-storage
+
+libimap_urlauth_la_SOURCES = \
+ imap-urlauth.c \
+ imap-urlauth-fetch.c \
+ imap-urlauth-backend.c \
+ imap-urlauth-connection.c
+
+headers = \
+ imap-urlauth.h \
+ imap-urlauth-private.h \
+ imap-urlauth-fetch.h \
+ imap-urlauth-backend.h \
+ imap-urlauth-connection.h
+
+pkginc_libdir=$(pkgincludedir)
+pkginc_lib_HEADERS = $(headers)
+
diff --git a/src/lib-imap-urlauth/Makefile.in b/src/lib-imap-urlauth/Makefile.in
new file mode 100644
index 0000000..9ff6efa
--- /dev/null
+++ b/src/lib-imap-urlauth/Makefile.in
@@ -0,0 +1,835 @@
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diff --git a/src/lib-imap-urlauth/imap-urlauth-backend.c b/src/lib-imap-urlauth/imap-urlauth-backend.c
new file mode 100644
index 0000000..de2b9c9
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth-backend.c
@@ -0,0 +1,174 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "buffer.h"
+#include "hex-binary.h"
+#include "randgen.h"
+#include "mail-user.h"
+#include "mail-storage.h"
+#include "mailbox-list-iter.h"
+#include "imap-urlauth-private.h"
+#include "imap-urlauth-backend.h"
+
+#define IMAP_URLAUTH_KEY MAILBOX_ATTRIBUTE_PREFIX_DOVECOT"imap-urlauth"
+
+static int
+imap_urlauth_backend_trans_set_mailbox_key(struct mailbox *box,
+ unsigned char mailbox_key_r[IMAP_URLAUTH_KEY_LEN],
+ const char **client_error_r,
+ enum mail_error *error_code_r)
+{
+ struct mail_attribute_value urlauth_key;
+ const char *mailbox_key_hex = NULL;
+ int ret;
+
+ if (mailbox_open(box) < 0) {
+ *client_error_r = mailbox_get_last_error(box, error_code_r);
+ return -1;
+ }
+
+ struct mailbox_transaction_context *t =
+ mailbox_transaction_begin(box,
+ MAILBOX_TRANSACTION_FLAG_EXTERNAL,
+ __func__);
+
+ /* create new key */
+ random_fill(mailbox_key_r, IMAP_URLAUTH_KEY_LEN);
+ mailbox_key_hex = binary_to_hex(mailbox_key_r,
+ IMAP_URLAUTH_KEY_LEN);
+ i_zero(&urlauth_key);
+ urlauth_key.value = mailbox_key_hex;
+ ret = mailbox_attribute_set(t, MAIL_ATTRIBUTE_TYPE_PRIVATE,
+ IMAP_URLAUTH_KEY, &urlauth_key);
+
+ if (mailbox_transaction_commit(&t) < 0) {
+ *client_error_r = mailbox_get_last_error(box, error_code_r);
+ ret = -1;
+ }
+
+ return ret;
+}
+
+static int
+imap_urlauth_backend_trans_get_mailbox_key(struct mailbox *box,
+ bool create,
+ unsigned char mailbox_key_r[IMAP_URLAUTH_KEY_LEN],
+ const char **client_error_r,
+ enum mail_error *error_code_r)
+{
+ struct mail_user *user = mail_storage_get_user(mailbox_get_storage(box));
+ struct mail_attribute_value urlauth_key;
+ const char *mailbox_key_hex = NULL;
+ buffer_t key_buf;
+ int ret;
+
+ *client_error_r = "Internal server error";
+ *error_code_r = MAIL_ERROR_TEMP;
+
+ ret = mailbox_attribute_get(box, MAIL_ATTRIBUTE_TYPE_PRIVATE,
+ IMAP_URLAUTH_KEY, &urlauth_key);
+ if (ret < 0)
+ return -1;
+
+ e_debug(user->event, "imap-urlauth: %skey found for mailbox %s",
+ (ret > 0 ? "" : "no "), mailbox_get_vname(box));
+
+ if (ret == 0) {
+ if (!create)
+ return 0;
+
+ ret = imap_urlauth_backend_trans_set_mailbox_key(box,
+ mailbox_key_r,
+ client_error_r,
+ error_code_r);
+
+ if (ret < 0)
+ return -1;
+ e_debug(user->event, "imap-urlauth: created key for mailbox %s",
+ mailbox_get_vname(box));
+ } else {
+ /* read existing key */
+ buffer_create_from_data(&key_buf, mailbox_key_r,
+ IMAP_URLAUTH_KEY_LEN);
+ mailbox_key_hex = urlauth_key.value;
+ if (strlen(mailbox_key_hex) != 2*IMAP_URLAUTH_KEY_LEN ||
+ hex_to_binary(mailbox_key_hex, &key_buf) < 0 ||
+ key_buf.used != IMAP_URLAUTH_KEY_LEN) {
+ i_error("imap-urlauth: key found for mailbox %s is invalid",
+ mailbox_get_vname(box));
+ return -1;
+ }
+ }
+ return 1;
+}
+
+int imap_urlauth_backend_get_mailbox_key(struct mailbox *box, bool create,
+ unsigned char mailbox_key_r[IMAP_URLAUTH_KEY_LEN],
+ const char **client_error_r,
+ enum mail_error *error_code_r)
+{
+ int ret;
+
+ ret = imap_urlauth_backend_trans_get_mailbox_key(box, create,
+ mailbox_key_r,
+ client_error_r,
+ error_code_r);
+ return ret;
+}
+
+int imap_urlauth_backend_reset_mailbox_key(struct mailbox *box)
+{
+ struct mailbox_transaction_context *t;
+ int ret;
+
+ t = mailbox_transaction_begin(box, MAILBOX_TRANSACTION_FLAG_EXTERNAL,
+ __func__);
+ ret = mailbox_attribute_unset(t, MAIL_ATTRIBUTE_TYPE_PRIVATE,
+ IMAP_URLAUTH_KEY);
+ if (mailbox_transaction_commit(&t) < 0)
+ ret = -1;
+ return ret;
+}
+
+static int imap_urlauth_backend_mailbox_reset_key(struct mailbox *box)
+{
+ const char *errstr;
+ enum mail_error error;
+
+ if (mailbox_open(box) < 0) {
+ errstr = mailbox_get_last_internal_error(box, &error);
+ if (error == MAIL_ERROR_NOTFOUND || error == MAIL_ERROR_PERM)
+ return 0;
+ i_error("urlauth key reset: Couldn't open mailbox %s: %s",
+ mailbox_get_vname(box), errstr);
+ return -1;
+ }
+ return imap_urlauth_backend_reset_mailbox_key(box);
+}
+
+int imap_urlauth_backend_reset_all_keys(struct mail_user *user)
+{
+ const char *const patterns[] = { "*", NULL };
+ struct mailbox_list_iterate_context *iter;
+ const struct mailbox_info *info;
+ struct mailbox *box;
+ int ret = 0;
+
+ iter = mailbox_list_iter_init_namespaces(user->namespaces, patterns,
+ MAIL_NAMESPACE_TYPE_MASK_ALL,
+ MAILBOX_LIST_ITER_NO_AUTO_BOXES |
+ MAILBOX_LIST_ITER_SKIP_ALIASES |
+ MAILBOX_LIST_ITER_RETURN_NO_FLAGS);
+ while ((info = mailbox_list_iter_next(iter)) != NULL) {
+ box = mailbox_alloc(info->ns->list, info->vname, 0);
+ if (imap_urlauth_backend_mailbox_reset_key(box) < 0)
+ ret = -1;
+ mailbox_free(&box);
+ }
+ if (mailbox_list_iter_deinit(&iter) < 0) {
+ i_error("urlauth key reset: Couldn't iterate mailboxes: %s",
+ mailbox_list_get_last_internal_error(user->namespaces->list, NULL));
+ ret = -1;
+ }
+ return ret;
+}
diff --git a/src/lib-imap-urlauth/imap-urlauth-backend.h b/src/lib-imap-urlauth/imap-urlauth-backend.h
new file mode 100644
index 0000000..b76ecc5
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth-backend.h
@@ -0,0 +1,16 @@
+#ifndef IMAP_URLAUTH_BACKEND_H
+#define IMAP_URLAUTH_BACKEND_H
+
+#define IMAP_URLAUTH_KEY_LEN 64
+
+struct imap_urlauth_backend;
+
+int imap_urlauth_backend_get_mailbox_key(struct mailbox *box, bool create,
+ unsigned char mailbox_key_r[IMAP_URLAUTH_KEY_LEN],
+ const char **client_error_r,
+ enum mail_error *error_code_r);
+int imap_urlauth_backend_reset_mailbox_key(struct mailbox *box);
+int imap_urlauth_backend_reset_all_keys(struct mail_user *user);
+
+#endif
+
diff --git a/src/lib-imap-urlauth/imap-urlauth-connection.c b/src/lib-imap-urlauth/imap-urlauth-connection.c
new file mode 100644
index 0000000..5fce6f7
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth-connection.c
@@ -0,0 +1,1027 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "llist.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "strescape.h"
+#include "ioloop.h"
+#include "safe-mkstemp.h"
+#include "hostpid.h"
+#include "net.h"
+#include "istream.h"
+#include "ostream.h"
+#include "write-full.h"
+#include "array.h"
+#include "aqueue.h"
+#include "mail-user.h"
+#include "imap-urlauth-fetch.h"
+
+#include "imap-urlauth-connection.h"
+
+enum imap_urlauth_state {
+ IMAP_URLAUTH_STATE_DISCONNECTED = 0,
+ IMAP_URLAUTH_STATE_AUTHENTICATING,
+ IMAP_URLAUTH_STATE_AUTHENTICATED,
+ IMAP_URLAUTH_STATE_SELECTING_TARGET,
+ IMAP_URLAUTH_STATE_UNSELECTING_TARGET,
+ IMAP_URLAUTH_STATE_READY,
+ IMAP_URLAUTH_STATE_REQUEST_PENDING,
+ IMAP_URLAUTH_STATE_REQUEST_WAIT,
+};
+
+struct imap_urlauth_request {
+ struct imap_urlauth_target *target;
+ struct imap_urlauth_request *prev, *next;
+
+ char *url;
+ enum imap_urlauth_fetch_flags flags;
+
+ char *bodypartstruct;
+
+ imap_urlauth_request_callback_t *callback;
+ void *context;
+
+ bool binary_has_nuls;
+};
+
+struct imap_urlauth_target {
+ struct imap_urlauth_target *prev, *next;
+
+ char *userid;
+
+ struct imap_urlauth_request *requests_head, *requests_tail;
+};
+
+struct imap_urlauth_connection {
+ int refcount;
+
+ char *path, *service, *session_id;
+ struct mail_user *user;
+
+ int fd;
+ struct istream *input;
+ struct ostream *output;
+ struct io *io;
+
+ struct timeout *to_reconnect, *to_idle, *to_response;
+ time_t last_reconnect;
+ unsigned int reconnect_attempts;
+ unsigned int idle_timeout_msecs;
+
+ char *literal_temp_path;
+ int literal_fd;
+ buffer_t *literal_buf;
+ uoff_t literal_size, literal_bytes_left;
+
+ enum imap_urlauth_state state;
+
+ /* userid => target struct */
+ struct imap_urlauth_target *targets_head, *targets_tail;
+
+ bool reading_literal:1;
+};
+
+#define IMAP_URLAUTH_RECONNECT_MIN_SECS 2
+#define IMAP_URLAUTH_RECONNECT_MAX_ATTEMPTS 3
+
+#define IMAP_URLAUTH_RESPONSE_TIMEOUT_MSECS 2*60*1000
+
+#define IMAP_URLAUTH_HANDSHAKE "VERSION\timap-urlauth\t2\t0\n"
+
+#define IMAP_URLAUTH_MAX_INLINE_LITERAL_SIZE (1024*32)
+
+static void imap_urlauth_connection_disconnect
+ (struct imap_urlauth_connection *conn, const char *reason);
+static void imap_urlauth_connection_abort
+ (struct imap_urlauth_connection *conn, const char *reason);
+static void imap_urlauth_connection_reconnect
+ (struct imap_urlauth_connection *conn);
+static void imap_urlauth_connection_idle_disconnect
+ (struct imap_urlauth_connection *conn);
+static void imap_urlauth_connection_timeout_abort
+ (struct imap_urlauth_connection *conn);
+static void imap_urlauth_connection_fail
+ (struct imap_urlauth_connection *conn);
+
+struct imap_urlauth_connection *
+imap_urlauth_connection_init(const char *path, const char *service,
+ struct mail_user *user, const char *session_id,
+ unsigned int idle_timeout_msecs)
+{
+ struct imap_urlauth_connection *conn;
+
+ conn = i_new(struct imap_urlauth_connection, 1);
+ conn->refcount = 1;
+ conn->service = i_strdup(service);
+ conn->path = i_strdup(path);
+ if (session_id != NULL)
+ conn->session_id = i_strdup(session_id);
+ conn->user = user;
+ conn->fd = -1;
+ conn->literal_fd = -1;
+ conn->idle_timeout_msecs = idle_timeout_msecs;
+ return conn;
+}
+
+void imap_urlauth_connection_deinit(struct imap_urlauth_connection **_conn)
+{
+ struct imap_urlauth_connection *conn = *_conn;
+
+ *_conn = NULL;
+
+ imap_urlauth_connection_abort(conn, NULL);
+
+ i_free(conn->path);
+ i_free(conn->service);
+ if (conn->session_id != NULL)
+ i_free(conn->session_id);
+
+ i_assert(conn->to_idle == NULL);
+ i_assert(conn->to_reconnect == NULL);
+ i_assert(conn->to_response == NULL);
+
+ i_free(conn);
+}
+
+static void
+imap_urlauth_stop_response_timeout(struct imap_urlauth_connection *conn)
+{
+ timeout_remove(&conn->to_response);
+}
+
+static void
+imap_urlauth_start_response_timeout(struct imap_urlauth_connection *conn)
+{
+ imap_urlauth_stop_response_timeout(conn);
+ conn->to_response = timeout_add(IMAP_URLAUTH_RESPONSE_TIMEOUT_MSECS,
+ imap_urlauth_connection_timeout_abort, conn);
+}
+
+static struct imap_urlauth_target *
+imap_urlauth_connection_get_target(struct imap_urlauth_connection *conn,
+ const char *target_user)
+{
+ struct imap_urlauth_target *target = conn->targets_head;
+
+ while (target != NULL) {
+ if (strcmp(target->userid, target_user) == 0)
+ return target;
+ target = target->next;
+ }
+
+ target = i_new(struct imap_urlauth_target, 1);
+ target->userid = i_strdup(target_user);
+ DLLIST2_APPEND(&conn->targets_head, &conn->targets_tail, target);
+ return target;
+}
+
+static void
+imap_urlauth_target_free(struct imap_urlauth_connection *conn,
+ struct imap_urlauth_target *target)
+{
+ DLLIST2_REMOVE(&conn->targets_head, &conn->targets_tail, target);
+ i_free(target->userid);
+ i_free(target);
+}
+
+static void
+imap_urlauth_connection_select_target(struct imap_urlauth_connection *conn)
+{
+ struct imap_urlauth_target *target = conn->targets_head;
+ const char *cmd;
+
+ if (target == NULL || conn->state != IMAP_URLAUTH_STATE_AUTHENTICATED)
+ return;
+
+ e_debug(conn->user->event,
+ "imap-urlauth: Selecting target user `%s'", target->userid);
+
+ conn->state = IMAP_URLAUTH_STATE_SELECTING_TARGET;
+ cmd = t_strdup_printf("USER\t%s\n", str_tabescape(target->userid));
+ if (o_stream_send_str(conn->output, cmd) < 0) {
+ i_warning("Error sending USER request to imap-urlauth server: %m");
+ imap_urlauth_connection_fail(conn);
+ }
+
+ imap_urlauth_start_response_timeout(conn);
+}
+
+static void
+imap_urlauth_connection_send_request(struct imap_urlauth_connection *conn)
+{
+ struct imap_urlauth_request *urlreq;
+ string_t *cmd;
+
+ if (conn->targets_head == NULL ||
+ (conn->targets_head->requests_head == NULL &&
+ conn->targets_head->next == NULL &&
+ conn->state == IMAP_URLAUTH_STATE_READY)) {
+ e_debug(conn->user->event,
+ "imap-urlauth: No more requests pending; scheduling disconnect");
+ timeout_remove(&conn->to_idle);
+ if (conn->idle_timeout_msecs > 0) {
+ conn->to_idle = timeout_add(conn->idle_timeout_msecs,
+ imap_urlauth_connection_idle_disconnect, conn);
+ }
+ return;
+ }
+
+ if (conn->state == IMAP_URLAUTH_STATE_AUTHENTICATED) {
+ imap_urlauth_connection_select_target(conn);
+ return;
+ }
+
+ if (conn->state != IMAP_URLAUTH_STATE_READY)
+ return;
+
+ urlreq = conn->targets_head->requests_head;
+ if (urlreq == NULL) {
+ if (conn->targets_head->next == NULL)
+ return;
+
+ conn->state = IMAP_URLAUTH_STATE_UNSELECTING_TARGET;
+ imap_urlauth_target_free(conn, conn->targets_head);
+
+ if (o_stream_send_str(conn->output, "END\n") < 0) {
+ i_warning("Error sending END request to imap-urlauth server: %m");
+ imap_urlauth_connection_fail(conn);
+ }
+ imap_urlauth_start_response_timeout(conn);
+ return;
+ }
+
+ e_debug(conn->user->event,
+ "imap-urlauth: Fetching URL `%s'", urlreq->url);
+
+ cmd = t_str_new(128);
+ str_append(cmd, "URL\t");
+ str_append_tabescaped(cmd, urlreq->url);
+ if ((urlreq->flags & IMAP_URLAUTH_FETCH_FLAG_BODYPARTSTRUCTURE) != 0)
+ str_append(cmd, "\tbpstruct");
+ if ((urlreq->flags & IMAP_URLAUTH_FETCH_FLAG_BINARY) != 0)
+ str_append(cmd, "\tbinary");
+ else if ((urlreq->flags & IMAP_URLAUTH_FETCH_FLAG_BODY) != 0)
+ str_append(cmd, "\tbody");
+ str_append_c(cmd, '\n');
+
+ conn->state = IMAP_URLAUTH_STATE_REQUEST_PENDING;
+ if (o_stream_send(conn->output, str_data(cmd), str_len(cmd)) < 0) {
+ i_warning("Error sending URL request to imap-urlauth server: %m");
+ imap_urlauth_connection_fail(conn);
+ }
+
+ imap_urlauth_start_response_timeout(conn);
+}
+
+struct imap_urlauth_request *
+imap_urlauth_request_new(struct imap_urlauth_connection *conn,
+ const char *target_user, const char *url,
+ enum imap_urlauth_fetch_flags flags,
+ imap_urlauth_request_callback_t *callback,
+ void *context)
+{
+ struct imap_urlauth_request *urlreq;
+ struct imap_urlauth_target *target;
+
+ target = imap_urlauth_connection_get_target(conn, target_user);
+
+ urlreq = i_new(struct imap_urlauth_request, 1);
+ urlreq->url = i_strdup(url);
+ urlreq->flags = flags;
+ urlreq->target = target;
+ urlreq->callback = callback;
+ urlreq->context = context;
+
+ DLLIST2_APPEND(&target->requests_head, &target->requests_tail, urlreq);
+
+ timeout_remove(&conn->to_idle);
+
+ e_debug(conn->user->event,
+ "imap-urlauth: Added request for URL `%s' from user `%s'",
+ url, target_user);
+
+ imap_urlauth_connection_send_request(conn);
+ return urlreq;
+}
+
+static void imap_urlauth_request_free(struct imap_urlauth_request *urlreq)
+{
+ struct imap_urlauth_target *target = urlreq->target;
+
+ DLLIST2_REMOVE(&target->requests_head, &target->requests_tail, urlreq);
+ i_free(urlreq->url);
+ i_free(urlreq->bodypartstruct);
+ i_free(urlreq);
+}
+
+static void imap_urlauth_request_drop(struct imap_urlauth_connection *conn,
+ struct imap_urlauth_request *urlreq)
+{
+ if ((conn->state == IMAP_URLAUTH_STATE_REQUEST_PENDING ||
+ conn->state == IMAP_URLAUTH_STATE_REQUEST_WAIT) &&
+ conn->targets_head != NULL &&
+ conn->targets_head->requests_head == urlreq) {
+ /* cannot just drop pending request without breaking
+ protocol state */
+ return;
+ }
+ imap_urlauth_request_free(urlreq);
+
+}
+
+void imap_urlauth_request_abort(struct imap_urlauth_connection *conn,
+ struct imap_urlauth_request *urlreq)
+{
+ imap_urlauth_request_callback_t *callback;
+
+ callback = urlreq->callback;
+ urlreq->callback = NULL;
+ if (callback != NULL) {
+ T_BEGIN {
+ callback(NULL, urlreq->context);
+ } T_END;
+ }
+
+ imap_urlauth_request_drop(conn, urlreq);
+}
+
+static void
+imap_urlauth_request_fail(struct imap_urlauth_connection *conn,
+ struct imap_urlauth_request *urlreq,
+ const char *error)
+{
+ struct imap_urlauth_fetch_reply reply;
+ imap_urlauth_request_callback_t *callback;
+ int ret = 1;
+
+ callback = urlreq->callback;
+ urlreq->callback = NULL;
+ if (callback != NULL) {
+ i_zero(&reply);
+ reply.url = urlreq->url;
+ reply.flags = urlreq->flags;
+ reply.succeeded = FALSE;
+ reply.error = error;
+
+ T_BEGIN {
+ ret = callback(&reply, urlreq->context);
+ } T_END;
+ }
+
+ void *urlreq_context = urlreq->context;
+ imap_urlauth_request_drop(conn, urlreq);
+
+ if (ret < 0) {
+ /* Drop any related requests upon error */
+ imap_urlauth_request_abort_by_context(conn, urlreq_context);
+ }
+
+ if (ret != 0)
+ imap_urlauth_connection_continue(conn);
+}
+
+static void
+imap_urlauth_target_abort(struct imap_urlauth_connection *conn,
+ struct imap_urlauth_target *target)
+{
+ struct imap_urlauth_request *urlreq, *next;
+
+ urlreq = target->requests_head;
+ while (urlreq != NULL) {
+ next = urlreq->next;
+ imap_urlauth_request_abort(conn, urlreq);
+ urlreq = next;
+ }
+
+ imap_urlauth_target_free(conn, target);
+}
+
+static void
+imap_urlauth_target_fail(struct imap_urlauth_connection *conn,
+ struct imap_urlauth_target *target, const char *error)
+{
+ struct imap_urlauth_request *urlreq, *next;
+
+ urlreq = target->requests_head;
+ while (urlreq != NULL) {
+ next = urlreq->next;
+ imap_urlauth_request_fail(conn, urlreq, error);
+ urlreq = next;
+ }
+
+ imap_urlauth_target_free(conn, target);
+}
+
+static void
+imap_urlauth_target_abort_by_context(struct imap_urlauth_connection *conn,
+ struct imap_urlauth_target *target,
+ void *context)
+{
+ struct imap_urlauth_request *urlreq, *next;
+
+ /* abort all matching requests */
+ urlreq = target->requests_head;
+ while (urlreq != NULL) {
+ next = urlreq->next;
+ if (urlreq->context == context)
+ imap_urlauth_request_abort(conn, urlreq);
+ urlreq = next;
+ }
+
+ if (target->requests_head == NULL)
+ imap_urlauth_target_free(conn, target);
+}
+
+static void
+imap_urlauth_connection_abort(struct imap_urlauth_connection *conn,
+ const char *reason)
+{
+ struct imap_urlauth_target *target, *next;
+
+ if (reason == NULL)
+ reason = "Aborting due to error";
+ imap_urlauth_connection_disconnect(conn, reason);
+
+ /* abort all requests */
+ target = conn->targets_head;
+ while (target != NULL) {
+ next = target->next;
+ imap_urlauth_target_abort(conn, target);
+ target = next;
+ }
+}
+
+void imap_urlauth_request_abort_by_context(struct imap_urlauth_connection *conn,
+ void *context)
+{
+ struct imap_urlauth_target *target, *next;
+
+ /* abort all matching requests */
+ target = conn->targets_head;
+ while (target != NULL) {
+ next = target->next;
+ imap_urlauth_target_abort_by_context(conn, target, context);
+ target = next;
+ }
+}
+
+static void imap_urlauth_connection_fail(struct imap_urlauth_connection *conn)
+{
+ if (conn->reconnect_attempts > IMAP_URLAUTH_RECONNECT_MAX_ATTEMPTS) {
+ imap_urlauth_connection_abort(conn,
+ "Connection failed and connection attempts exhausted");
+ } else {
+ imap_urlauth_connection_reconnect(conn);
+ }
+}
+
+static int
+imap_urlauth_connection_create_temp_fd(struct imap_urlauth_connection *conn,
+ const char **path_r)
+{
+ string_t *path;
+ int fd;
+
+ path = t_str_new(128);
+ mail_user_set_get_temp_prefix(path, conn->user->set);
+ fd = safe_mkstemp(path, 0600, (uid_t)-1, (gid_t)-1);
+ if (fd == -1) {
+ i_error("safe_mkstemp(%s) failed: %m", str_c(path));
+ return -1;
+ }
+
+ /* we just want the fd, unlink it */
+ if (i_unlink(str_c(path)) < 0) {
+ /* shouldn't happen.. */
+ i_close_fd(&fd);
+ return -1;
+ }
+
+ *path_r = str_c(path);
+ return fd;
+}
+
+static int
+imap_urlauth_connection_read_literal_init(struct imap_urlauth_connection *conn,
+ uoff_t size)
+{
+ const char *path;
+
+ i_assert(conn->literal_fd == -1 && conn->literal_buf == NULL);
+
+ if (size <= IMAP_URLAUTH_MAX_INLINE_LITERAL_SIZE) {
+ /* read the literal directly */
+ if (size > 0) {
+ conn->literal_buf =
+ buffer_create_dynamic(default_pool, size);
+ }
+ } else {
+ /* read it into a file */
+ conn->literal_fd =
+ imap_urlauth_connection_create_temp_fd(conn, &path);
+ if (conn->literal_fd == -1)
+ return -1;
+ conn->literal_temp_path = i_strdup(path);
+ }
+
+ conn->literal_size = size;
+ conn->literal_bytes_left = size;
+ conn->reading_literal = TRUE;
+ return 1;
+}
+
+void imap_urlauth_connection_continue(struct imap_urlauth_connection *conn)
+{
+ i_assert(conn->targets_head != NULL);
+ i_assert(conn->targets_head->requests_head != NULL);
+
+ if (conn->state != IMAP_URLAUTH_STATE_REQUEST_WAIT)
+ return;
+
+ conn->state = IMAP_URLAUTH_STATE_READY;
+ imap_urlauth_request_free(conn->targets_head->requests_head);
+
+ imap_urlauth_connection_send_request(conn);
+}
+
+static int
+imap_urlauth_connection_read_literal_data(struct imap_urlauth_connection *conn)
+{
+ const unsigned char *data;
+ size_t size;
+
+ /* read data */
+ data = i_stream_get_data(conn->input, &size);
+ if (size > conn->literal_bytes_left)
+ size = conn->literal_bytes_left;
+
+ /* write to buffer or file */
+ if (size > 0) {
+ if (conn->literal_fd >= 0) {
+ if (write_full(conn->literal_fd, data, size) < 0) {
+ i_error("imap-urlauth: write(%s) failed: %m",
+ conn->literal_temp_path);
+ return -1;
+ }
+ } else {
+ i_assert(conn->literal_buf != NULL);
+ buffer_append(conn->literal_buf, data, size);
+ }
+ i_stream_skip(conn->input, size);
+ conn->literal_bytes_left -= size;
+ }
+
+ /* exit if not finished */
+ if (conn->literal_bytes_left > 0)
+ return 0;
+
+ /* read LF guard */
+ data = i_stream_get_data(conn->input, &size);
+ if (size < 1)
+ return 0;
+
+ /* check LF guard */
+ if (data[0] != '\n') {
+ i_error("imap-urlauth: no LF at end of literal (found 0x%x)",
+ data[0]);
+ return -1;
+ }
+ i_stream_skip(conn->input, 1);
+ return 1;
+}
+
+static void literal_stream_destroy(buffer_t *buffer)
+{
+ buffer_free(&buffer);
+}
+
+static int
+imap_urlauth_fetch_reply_set_literal_stream(struct imap_urlauth_connection *conn,
+ struct imap_urlauth_fetch_reply *reply)
+{
+ const unsigned char *data;
+ size_t size;
+ uoff_t fd_size;
+
+ if (conn->literal_fd != -1) {
+ reply->input = i_stream_create_fd_autoclose(&conn->literal_fd,
+ SIZE_MAX);
+ if (i_stream_get_size(reply->input, TRUE, &fd_size) < 1 ||
+ fd_size != conn->literal_size) {
+ i_stream_unref(&reply->input);
+ i_error("imap-urlauth: Failed to obtain proper size from literal stream");
+ imap_urlauth_connection_abort(conn,
+ "Failed during literal transfer");
+ return -1;
+ }
+ } else {
+ data = buffer_get_data(conn->literal_buf, &size);
+ i_assert(size == conn->literal_size);
+ reply->input = i_stream_create_from_data(data, size);
+ i_stream_add_destroy_callback(reply->input,
+ literal_stream_destroy,
+ conn->literal_buf);
+ }
+ reply->size = conn->literal_size;
+ return 0;
+}
+
+static int
+imap_urlauth_connection_read_literal(struct imap_urlauth_connection *conn)
+{
+ struct imap_urlauth_request *urlreq = conn->targets_head->requests_head;
+ struct imap_urlauth_fetch_reply reply;
+ imap_urlauth_request_callback_t *callback;
+ int ret;
+
+ i_assert(conn->reading_literal);
+ i_assert(urlreq != NULL);
+
+ if (conn->literal_size > 0) {
+ ret = imap_urlauth_connection_read_literal_data(conn);
+ if (ret <= 0)
+ return ret;
+ }
+ i_assert(conn->literal_bytes_left == 0);
+
+ /* reply */
+ i_zero(&reply);
+ reply.url = urlreq->url;
+ reply.flags = urlreq->flags;
+ reply.bodypartstruct = urlreq->bodypartstruct;
+ reply.binary_has_nuls = urlreq->binary_has_nuls ? 1 : 0;
+
+ if (conn->literal_size > 0) {
+ if (imap_urlauth_fetch_reply_set_literal_stream(conn, &reply) < 0)
+ return -1;
+ }
+ reply.succeeded = TRUE;
+
+ ret = 1;
+ callback = urlreq->callback;
+ urlreq->callback = NULL;
+ if (callback != NULL) T_BEGIN {
+ ret = callback(&reply, urlreq->context);
+ } T_END;
+
+ if (reply.input != NULL)
+ i_stream_unref(&reply.input);
+
+ if (ret < 0) {
+ /* Drop any related requests upon error */
+ imap_urlauth_request_abort_by_context(conn, urlreq->context);
+ }
+
+ conn->state = IMAP_URLAUTH_STATE_REQUEST_WAIT;
+ if (ret != 0)
+ imap_urlauth_connection_continue(conn);
+
+ /* finished */
+ i_free_and_null(conn->literal_temp_path);
+ conn->literal_fd = -1;
+ conn->literal_buf = NULL;
+ conn->reading_literal = FALSE;
+ return 1;
+}
+
+static int imap_urlauth_input_pending(struct imap_urlauth_connection *conn)
+{
+ struct imap_urlauth_request *urlreq;
+ const char *response, *const *args, *bpstruct = NULL;
+ uoff_t literal_size;
+
+ i_assert(conn->targets_head != NULL);
+ i_assert(conn->targets_head->requests_head != NULL);
+ urlreq = conn->targets_head->requests_head;
+
+ if (conn->reading_literal) {
+ /* Read pending literal; may callback */
+ return imap_urlauth_connection_read_literal(conn);
+ }
+
+ /* "OK"[<metadata-items>]"\t"<literal-size>"\n" or
+ "NO"["\terror="<error>]"\n" */
+ if ((response = i_stream_next_line(conn->input)) == NULL)
+ return 0;
+ imap_urlauth_stop_response_timeout(conn);
+
+ args = t_strsplit_tabescaped(response);
+ if (args[0] == NULL) {
+ i_error("imap-urlauth: Empty URL response: %s",
+ str_sanitize(response, 80));
+ return -1;
+ }
+
+ if (strcmp(args[0], "OK") != 0 || args[1] == NULL) {
+ if (strcmp(args[0], "NO") == 0) {
+ const char *param = args[1], *error = NULL;
+
+ if (param != NULL &&
+ strncasecmp(param, "error=", 6) == 0 &&
+ param[6] != '\0') {
+ error = param+6;
+ }
+ conn->state = IMAP_URLAUTH_STATE_REQUEST_WAIT;
+ imap_urlauth_request_fail(conn,
+ conn->targets_head->requests_head, error);
+ return 1;
+ }
+ i_error("imap-urlauth: Unexpected URL response: %s",
+ str_sanitize(response, 80));
+ return -1;
+ }
+
+ /* read metadata */
+ args++;
+ for (; args[1] != NULL; args++) {
+ const char *param = args[0];
+
+ if (strcasecmp(param, "hasnuls") == 0) {
+ urlreq->binary_has_nuls = TRUE;
+ } else if (strncasecmp(param, "bpstruct=", 9) == 0 &&
+ param[9] != '\0') {
+ bpstruct = param+9;
+ }
+ }
+
+ /* read literal size */
+ if (str_to_uoff(args[0], &literal_size) < 0) {
+ i_error("imap-urlauth: "
+ "Overflowing unsigned integer value for literal size: %s",
+ args[1]);
+ return -1;
+ }
+
+ /* read literal */
+ if (imap_urlauth_connection_read_literal_init(conn, literal_size) < 0)
+ return -1;
+
+ urlreq->bodypartstruct = i_strdup(bpstruct);
+ return imap_urlauth_connection_read_literal(conn);
+}
+
+static int imap_urlauth_input_next(struct imap_urlauth_connection *conn)
+{
+ const char *response;
+ int ret;
+
+ switch (conn->state) {
+ case IMAP_URLAUTH_STATE_AUTHENTICATING:
+ case IMAP_URLAUTH_STATE_UNSELECTING_TARGET:
+ if ((response = i_stream_next_line(conn->input)) == NULL)
+ return 0;
+ imap_urlauth_stop_response_timeout(conn);
+
+ if (strcasecmp(response, "OK") != 0) {
+ if (conn->state == IMAP_URLAUTH_STATE_AUTHENTICATING)
+ i_error("imap-urlauth: Failed to authenticate to service: "
+ "Got unexpected response: %s", str_sanitize(response, 80));
+ else
+ i_error("imap-urlauth: Failed to unselect target user: "
+ "Got unexpected response: %s", str_sanitize(response, 80));
+ imap_urlauth_connection_abort(conn, NULL);
+ return -1;
+ }
+
+ if (conn->state == IMAP_URLAUTH_STATE_AUTHENTICATING) {
+ e_debug(conn->user->event,
+ "imap-urlauth: Successfully authenticated to service");
+ } else {
+ e_debug(conn->user->event,
+ "imap-urlauth: Successfully unselected target user");
+ }
+
+ conn->state = IMAP_URLAUTH_STATE_AUTHENTICATED;
+ imap_urlauth_connection_select_target(conn);
+ return 0;
+ case IMAP_URLAUTH_STATE_SELECTING_TARGET:
+ if ((response = i_stream_next_line(conn->input)) == NULL)
+ return 0;
+ imap_urlauth_stop_response_timeout(conn);
+
+ i_assert(conn->targets_head != NULL);
+
+ if (strcasecmp(response, "NO") == 0) {
+ e_debug(conn->user->event,
+ "imap-urlauth: Failed to select target user %s",
+ conn->targets_head->userid);
+ imap_urlauth_target_fail(conn, conn->targets_head, NULL);
+
+ conn->state = IMAP_URLAUTH_STATE_AUTHENTICATED;
+ imap_urlauth_connection_select_target(conn);
+ return 0;
+ }
+ if (strcasecmp(response, "OK") != 0) {
+ i_error("imap-urlauth: Failed to select target user %s: "
+ "Got unexpected response: %s", conn->targets_head->userid,
+ str_sanitize(response, 80));
+ imap_urlauth_connection_abort(conn, NULL);
+ return -1;
+ }
+
+ e_debug(conn->user->event,
+ "imap-urlauth: Successfully selected target user %s",
+ conn->targets_head->userid);
+ conn->state = IMAP_URLAUTH_STATE_READY;
+ imap_urlauth_connection_send_request(conn);
+ return 0;
+ case IMAP_URLAUTH_STATE_AUTHENTICATED:
+ case IMAP_URLAUTH_STATE_READY:
+ case IMAP_URLAUTH_STATE_REQUEST_WAIT:
+ if ((response = i_stream_next_line(conn->input)) == NULL)
+ return 0;
+
+ i_error("imap-urlauth: Received input while no requests were pending: %s",
+ str_sanitize(response, 80));
+ imap_urlauth_connection_abort(conn, NULL);
+ return -1;
+ case IMAP_URLAUTH_STATE_REQUEST_PENDING:
+ if ((ret = imap_urlauth_input_pending(conn)) < 0)
+ imap_urlauth_connection_fail(conn);
+ return ret;
+ case IMAP_URLAUTH_STATE_DISCONNECTED:
+ break;
+ }
+ i_unreached();
+}
+
+static void imap_urlauth_input(struct imap_urlauth_connection *conn)
+{
+ i_assert(conn->state != IMAP_URLAUTH_STATE_DISCONNECTED);
+
+ if (conn->input->closed) {
+ /* disconnected */
+ i_error("imap-urlauth: Service disconnected unexpectedly");
+ imap_urlauth_connection_fail(conn);
+ return;
+ }
+
+ switch (i_stream_read(conn->input)) {
+ case -1:
+ /* disconnected */
+ i_error("imap-urlauth: Service disconnected unexpectedly");
+ imap_urlauth_connection_fail(conn);
+ return;
+ case -2:
+ /* input buffer full */
+ i_error("imap-urlauth: Service sent too large input");
+ imap_urlauth_connection_abort(conn, NULL);
+ return;
+ }
+
+ while (!conn->input->closed) {
+ if (imap_urlauth_input_next(conn) <= 0)
+ break;
+ }
+}
+
+static int
+imap_urlauth_connection_do_connect(struct imap_urlauth_connection *conn)
+{
+ string_t *str;
+ int fd;
+
+ if (conn->state != IMAP_URLAUTH_STATE_DISCONNECTED) {
+ imap_urlauth_connection_send_request(conn);
+ return 1;
+ }
+
+ if (conn->user->auth_token == NULL) {
+ i_error("imap-urlauth: cannot authenticate because no auth token "
+ "is available for this session (running standalone?).");
+ imap_urlauth_connection_abort(conn, NULL);
+ return -1;
+ }
+
+ e_debug(conn->user->event, "imap-urlauth: Connecting to service at %s", conn->path);
+
+ i_assert(conn->fd == -1);
+ fd = net_connect_unix(conn->path);
+ if (fd == -1) {
+ i_error("imap-urlauth: net_connect_unix(%s) failed: %m",
+ conn->path);
+ imap_urlauth_connection_abort(conn, NULL);
+ return -1;
+ }
+
+ timeout_remove(&conn->to_reconnect);
+
+ conn->fd = fd;
+ conn->input = i_stream_create_fd(fd, SIZE_MAX);
+ conn->output = o_stream_create_fd(fd, SIZE_MAX);
+ conn->io = io_add(fd, IO_READ, imap_urlauth_input, conn);
+ conn->state = IMAP_URLAUTH_STATE_AUTHENTICATING;
+
+ str = t_str_new(128);
+ str_printfa(str, IMAP_URLAUTH_HANDSHAKE"AUTH\t%s\t%s\t",
+ conn->service, my_pid);
+ str_append_tabescaped(str, conn->user->username);
+ str_append_c(str, '\t');
+ if (conn->session_id != NULL)
+ str_append_tabescaped(str, conn->session_id);
+ str_append_c(str, '\t');
+ str_append_tabescaped(str, conn->user->auth_token);
+ str_append_c(str, '\n');
+ if (o_stream_send(conn->output, str_data(str), str_len(str)) < 0) {
+ i_warning("Error sending handshake to imap-urlauth server: %m");
+ imap_urlauth_connection_abort(conn, NULL);
+ return -1;
+ }
+
+ imap_urlauth_start_response_timeout(conn);
+ return 0;
+}
+
+int imap_urlauth_connection_connect(struct imap_urlauth_connection *conn)
+{
+ conn->reconnect_attempts = 0;
+
+ if (conn->to_reconnect == NULL)
+ return imap_urlauth_connection_do_connect(conn);
+ return 0;
+}
+
+static void imap_urlauth_connection_disconnect
+(struct imap_urlauth_connection *conn, const char *reason)
+{
+ conn->state = IMAP_URLAUTH_STATE_DISCONNECTED;
+
+ if (conn->fd != -1) {
+ if (reason == NULL)
+ e_debug(conn->user->event, "imap-urlauth: Disconnecting from service");
+ else
+ e_debug(conn->user->event, "imap-urlauth: Disconnected: %s", reason);
+
+ io_remove(&conn->io);
+ i_stream_destroy(&conn->input);
+ o_stream_destroy(&conn->output);
+ net_disconnect(conn->fd);
+ conn->fd = -1;
+ }
+ conn->reading_literal = FALSE;
+
+ if (conn->literal_fd != -1) {
+ if (close(conn->literal_fd) < 0)
+ i_error("imap-urlauth: close(%s) failed: %m", conn->literal_temp_path);
+
+ i_free_and_null(conn->literal_temp_path);
+ conn->literal_fd = -1;
+ }
+
+ buffer_free(&conn->literal_buf);
+ timeout_remove(&conn->to_reconnect);
+ timeout_remove(&conn->to_idle);
+ imap_urlauth_stop_response_timeout(conn);
+}
+
+static void
+imap_urlauth_connection_do_reconnect(struct imap_urlauth_connection *conn)
+{
+ if (conn->reconnect_attempts >= IMAP_URLAUTH_RECONNECT_MAX_ATTEMPTS) {
+ imap_urlauth_connection_abort(conn,
+ "Connection failed and connection attempts exhausted");
+ return;
+ }
+
+ if (ioloop_time - conn->last_reconnect < IMAP_URLAUTH_RECONNECT_MIN_SECS) {
+ e_debug(conn->user->event, "imap-urlauth: Scheduling reconnect");
+ timeout_remove(&conn->to_reconnect);
+ conn->to_reconnect =
+ timeout_add(IMAP_URLAUTH_RECONNECT_MIN_SECS*1000,
+ imap_urlauth_connection_do_reconnect, conn);
+ } else {
+ conn->reconnect_attempts++;
+ conn->last_reconnect = ioloop_time;
+ (void)imap_urlauth_connection_do_connect(conn);
+ }
+}
+
+static void
+imap_urlauth_connection_reconnect(struct imap_urlauth_connection *conn)
+{
+ imap_urlauth_connection_disconnect(conn, NULL);
+
+ /* don't reconnect if there are no requests */
+ if (conn->targets_head == NULL)
+ return;
+
+ imap_urlauth_connection_do_reconnect(conn);
+}
+
+static void
+imap_urlauth_connection_idle_disconnect(struct imap_urlauth_connection *conn)
+{
+ imap_urlauth_connection_disconnect(conn, "Idle timeout");
+}
+
+static void
+imap_urlauth_connection_timeout_abort(struct imap_urlauth_connection *conn)
+{
+ imap_urlauth_connection_abort(conn, "Service is not responding");
+}
+
+bool imap_urlauth_connection_is_connected(struct imap_urlauth_connection *conn)
+{
+ return conn->fd != -1 && conn->state != IMAP_URLAUTH_STATE_DISCONNECTED;
+}
diff --git a/src/lib-imap-urlauth/imap-urlauth-connection.h b/src/lib-imap-urlauth/imap-urlauth-connection.h
new file mode 100644
index 0000000..b60186a
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth-connection.h
@@ -0,0 +1,42 @@
+#ifndef IMAP_URLAUTH_CONNECTION_H
+#define IMAP_URLAUTH_CONNECTION_H
+
+struct imap_urlauth_request;
+struct imap_urlauth_fetch_reply;
+
+typedef int
+imap_urlauth_request_callback_t(struct imap_urlauth_fetch_reply *reply,
+ void *context);
+
+/* If reconnect_callback is specified, it's called when connection is lost.
+ If the callback returns FALSE, reconnection isn't attempted. */
+struct imap_urlauth_connection *
+imap_urlauth_connection_init(const char *path, const char *service,
+ struct mail_user *user, const char *session_id,
+ unsigned int idle_timeout_msecs);
+void imap_urlauth_connection_deinit(struct imap_urlauth_connection **conn);
+
+/* Connect to imap-urlauth (even if failed for previous requests). */
+int imap_urlauth_connection_connect(struct imap_urlauth_connection *conn);
+
+/* Continue after request callback returned 0 */
+void imap_urlauth_connection_continue(struct imap_urlauth_connection *conn);
+
+/* Create a new URL fetch request */
+struct imap_urlauth_request *
+imap_urlauth_request_new(struct imap_urlauth_connection *conn,
+ const char *target_user, const char *url,
+ enum imap_urlauth_fetch_flags flags,
+ imap_urlauth_request_callback_t *callback,
+ void *context);
+/* Abort request */
+void imap_urlauth_request_abort(struct imap_urlauth_connection *conn,
+ struct imap_urlauth_request *urlreq);
+/* Abort all requests with matching context value */
+void imap_urlauth_request_abort_by_context(struct imap_urlauth_connection *conn,
+ void *context);
+
+/* Returns TRUE if currently connected imap-urlauth service. */
+bool imap_urlauth_connection_is_connected(struct imap_urlauth_connection *conn);
+
+#endif
diff --git a/src/lib-imap-urlauth/imap-urlauth-fetch.c b/src/lib-imap-urlauth/imap-urlauth-fetch.c
new file mode 100644
index 0000000..d5746f1
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth-fetch.c
@@ -0,0 +1,530 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "llist.h"
+#include "array.h"
+#include "net.h"
+#include "istream.h"
+#include "mail-user.h"
+#include "mail-error.h"
+#include "mail-storage.h"
+#include "imap-url.h"
+#include "imap-msgpart-url.h"
+#include "imap-urlauth-private.h"
+#include "imap-urlauth-fetch.h"
+#include "imap-urlauth-connection.h"
+
+struct imap_urlauth_fetch_url {
+ struct imap_urlauth_fetch_url *prev, *next;
+
+ char *url;
+ enum imap_urlauth_fetch_flags flags;
+};
+
+struct imap_urlauth_fetch {
+ unsigned int refcount;
+ struct imap_urlauth_context *uctx;
+
+ imap_urlauth_fetch_callback_t *callback;
+ void *context;
+
+ /* local urls */
+ struct imap_urlauth_fetch_url *local_urls_head, *local_urls_tail;
+ struct imap_msgpart_url *local_url;
+
+ unsigned int pending_requests;
+
+ struct {
+ char *url;
+ enum imap_urlauth_fetch_flags flags;
+
+ struct istream *input;
+ uoff_t size;
+
+ char *bodypartstruct;
+ char *error;
+
+ bool succeeded:1;
+ bool binary_has_nuls:1;
+ } pending_reply;
+
+ bool failed:1;
+ bool waiting_local:1;
+ bool waiting_service:1;
+};
+
+static void imap_urlauth_fetch_abort_local(struct imap_urlauth_fetch *ufetch)
+{
+ struct imap_urlauth_fetch_url *url, *url_next;
+
+ if (ufetch->local_url != NULL) {
+ ufetch->pending_requests--;
+ imap_msgpart_url_free(&ufetch->local_url);
+ }
+
+ i_free_and_null(ufetch->pending_reply.url);
+ i_free_and_null(ufetch->pending_reply.bodypartstruct);
+ i_free_and_null(ufetch->pending_reply.error);
+ i_stream_unref(&ufetch->pending_reply.input);
+
+ url = ufetch->local_urls_head;
+ for (; url != NULL; url = url_next) {
+ url_next = url->next;
+ i_free(url->url);
+ i_free(url);
+ ufetch->pending_requests--;
+ }
+ ufetch->local_urls_head = ufetch->local_urls_tail = NULL;
+}
+
+static void imap_urlauth_fetch_abort(struct imap_urlauth_fetch *ufetch)
+{
+ if (ufetch->pending_requests > 0)
+ imap_urlauth_request_abort_by_context(ufetch->uctx->conn, ufetch);
+
+ imap_urlauth_fetch_abort_local(ufetch);
+
+ i_assert(ufetch->pending_requests == 0);
+}
+
+static void imap_urlauth_fetch_fail(struct imap_urlauth_fetch *ufetch)
+{
+ imap_urlauth_fetch_abort(ufetch);
+ ufetch->failed = TRUE;
+}
+
+struct imap_urlauth_fetch *
+imap_urlauth_fetch_init(struct imap_urlauth_context *uctx,
+ imap_urlauth_fetch_callback_t *callback, void *context)
+{
+ struct imap_urlauth_fetch *ufetch;
+
+ ufetch = i_new(struct imap_urlauth_fetch, 1);
+ ufetch->refcount = 1;
+ ufetch->uctx = uctx;
+ ufetch->callback = callback;
+ ufetch->context = context;
+ return ufetch;
+}
+
+static void imap_urlauth_fetch_ref(struct imap_urlauth_fetch *ufetch)
+{
+ i_assert(ufetch->refcount > 0);
+ ufetch->refcount++;
+}
+
+static void imap_urlauth_fetch_unref(struct imap_urlauth_fetch **_ufetch)
+{
+ struct imap_urlauth_fetch *ufetch = *_ufetch;
+
+ i_assert(ufetch->refcount > 0);
+
+ *_ufetch = NULL;
+ if (--ufetch->refcount > 0)
+ return;
+
+ ufetch->refcount++;
+ imap_urlauth_fetch_abort(ufetch);
+ ufetch->refcount--;
+ i_assert(ufetch->refcount == 0);
+
+ /* dont leave the connection in limbo; make sure continue is called */
+ if (ufetch->waiting_service)
+ imap_urlauth_connection_continue(ufetch->uctx->conn);
+ i_free(ufetch);
+}
+
+void imap_urlauth_fetch_deinit(struct imap_urlauth_fetch **_ufetch)
+{
+ imap_urlauth_fetch_unref(_ufetch);
+}
+
+static void
+imap_urlauth_fetch_error(struct imap_urlauth_fetch *ufetch, const char *url,
+ enum imap_urlauth_fetch_flags url_flags,
+ const char *error)
+{
+ struct imap_urlauth_fetch_reply reply;
+ int ret;
+
+ ufetch->pending_requests--;
+
+ i_zero(&reply);
+ reply.url = url;
+ reply.flags = url_flags;
+ reply.succeeded = FALSE;
+ reply.error = error;
+
+ T_BEGIN {
+ ret = ufetch->callback(&reply, ufetch->pending_requests == 0,
+ ufetch->context);
+ } T_END;
+
+ if (ret == 0) {
+ ufetch->waiting_local = TRUE;
+ ufetch->pending_requests++;
+ } else if (ret < 0) {
+ imap_urlauth_fetch_fail(ufetch);
+ }
+}
+
+static void
+imap_urlauth_fetch_local(struct imap_urlauth_fetch *ufetch, const char *url,
+ enum imap_urlauth_fetch_flags url_flags,
+ struct imap_url *imap_url)
+{
+ struct imap_urlauth_fetch_reply reply;
+ struct imap_msgpart_open_result mpresult;
+ const char *error, *errormsg = NULL, *bpstruct = NULL;
+ bool debug = ufetch->uctx->user->mail_debug, success;
+ enum mail_error error_code;
+ struct imap_msgpart_url *mpurl = NULL;
+ int ret;
+
+ success = TRUE;
+
+ if (debug)
+ i_debug("Fetching local URLAUTH %s", url);
+
+ if (url_flags == 0)
+ url_flags = IMAP_URLAUTH_FETCH_FLAG_BODY;
+
+ /* fetch URL */
+ if (imap_url == NULL) {
+ ret = imap_urlauth_fetch(ufetch->uctx, url,
+ &mpurl, &error_code, &error);
+ } else {
+ ret = imap_urlauth_fetch_parsed(ufetch->uctx, imap_url,
+ &mpurl, &error_code, &error);
+ }
+ if (ret <= 0) {
+ if (ret == 0) {
+ errormsg = t_strdup_printf("Failed to fetch URLAUTH \"%s\": %s",
+ url, error);
+ if (debug)
+ i_debug("%s", errormsg);
+ }
+ success = FALSE;
+ }
+
+ /* fetch metadata */
+ if (success && (url_flags & IMAP_URLAUTH_FETCH_FLAG_BINARY) != 0)
+ imap_msgpart_url_set_decode_to_binary(mpurl);
+ if (success &&
+ (url_flags & IMAP_URLAUTH_FETCH_FLAG_BODYPARTSTRUCTURE) != 0) {
+ ret = imap_msgpart_url_get_bodypartstructure(mpurl, &bpstruct, &error);
+ if (ret <= 0) {
+ if (ret == 0) {
+ errormsg = t_strdup_printf
+ ("Failed to read URLAUTH \"%s\": %s", url, error);
+ if (debug)
+ i_debug("%s", errormsg);
+ }
+ success = FALSE;
+ }
+ }
+
+ /* if requested, read the message part the URL points to */
+ i_zero(&mpresult);
+ if (success && ((url_flags & IMAP_URLAUTH_FETCH_FLAG_BODY) != 0 ||
+ (url_flags & IMAP_URLAUTH_FETCH_FLAG_BINARY) != 0)) {
+ ret = imap_msgpart_url_read_part(mpurl, &mpresult, &error);
+ if (ret <= 0) {
+ if (ret == 0) {
+ errormsg = t_strdup_printf
+ ("Failed to read URLAUTH \"%s\": %s", url, error);
+ if (debug)
+ i_debug("%s", errormsg);
+ }
+ success = FALSE;
+ }
+ }
+
+ if (debug && success) {
+ if (bpstruct != NULL)
+ i_debug("Fetched URLAUTH yielded BODYPARTSTRUCTURE (%s)", bpstruct);
+ if (mpresult.size == 0 || mpresult.input == NULL)
+ i_debug("Fetched URLAUTH yielded empty result");
+ else {
+ i_debug("Fetched URLAUTH yielded %"PRIuUOFF_T" bytes "
+ "of %smessage data", mpresult.size,
+ (mpresult.binary_decoded_input_has_nuls ? "binary " : ""));
+ }
+ }
+
+ ufetch->pending_requests--;
+
+ if (!success && ret < 0) {
+ if (mpurl != NULL)
+ imap_msgpart_url_free(&mpurl);
+ (void)ufetch->callback(NULL, TRUE, ufetch->context);
+ imap_urlauth_fetch_fail(ufetch);
+ return;
+ }
+
+ i_zero(&reply);
+ reply.url = url;
+ reply.flags = url_flags;
+ reply.error = errormsg;
+ reply.succeeded = success;
+
+ reply.bodypartstruct = bpstruct;
+ reply.binary_has_nuls = mpresult.binary_decoded_input_has_nuls;
+ reply.size = mpresult.size;
+ reply.input = mpresult.input;
+
+ ret = ufetch->callback(&reply, ufetch->pending_requests == 0,
+ ufetch->context);
+ if (ret == 0) {
+ ufetch->local_url = mpurl;
+ ufetch->waiting_local = TRUE;
+ ufetch->pending_requests++;
+ } else {
+
+ if (mpurl != NULL)
+ imap_msgpart_url_free(&mpurl);
+ if (ret < 0)
+ imap_urlauth_fetch_fail(ufetch);
+ }
+}
+
+static int
+imap_urlauth_fetch_request_callback(struct imap_urlauth_fetch_reply *reply,
+ void *context)
+{
+ struct imap_urlauth_fetch *ufetch =
+ (struct imap_urlauth_fetch *)context;
+ int ret = 1;
+
+ if (ufetch->waiting_local && reply != NULL) {
+ i_assert(ufetch->pending_reply.url == NULL);
+ ufetch->pending_reply.url = i_strdup(reply->url);
+ ufetch->pending_reply.flags = reply->flags;
+ ufetch->pending_reply.bodypartstruct =
+ i_strdup(reply->bodypartstruct);
+ ufetch->pending_reply.error = i_strdup(reply->error);
+ if (reply->input != NULL) {
+ ufetch->pending_reply.input = reply->input;
+ i_stream_ref(ufetch->pending_reply.input);
+ }
+ ufetch->pending_reply.size = reply->size;
+ ufetch->pending_reply.succeeded = reply->succeeded;
+ ufetch->pending_reply.binary_has_nuls = reply->binary_has_nuls;
+ ufetch->waiting_service = TRUE;
+ return 0;
+ }
+
+ ufetch->waiting_local = FALSE;
+ ufetch->pending_requests--;
+
+ imap_urlauth_fetch_ref(ufetch);
+
+ if (!ufetch->failed) {
+ bool last = ufetch->pending_requests == 0 || reply == NULL;
+ ret = ufetch->callback(reply, last, ufetch->context);
+ }
+
+ /* report failure only once */
+ if (ret < 0 || reply == NULL) {
+ if (!ufetch->failed)
+ imap_urlauth_fetch_abort_local(ufetch);
+ ufetch->failed = TRUE;
+ } else if (ret == 0) {
+ ufetch->waiting_service = TRUE;
+ ufetch->pending_requests++;
+ }
+
+ imap_urlauth_fetch_unref(&ufetch);
+ return ret;
+}
+
+int imap_urlauth_fetch_url(struct imap_urlauth_fetch *ufetch, const char *url,
+ enum imap_urlauth_fetch_flags url_flags)
+{
+ struct imap_urlauth_context *uctx = ufetch->uctx;
+ enum imap_url_parse_flags url_parse_flags =
+ IMAP_URL_PARSE_ALLOW_URLAUTH;
+ struct mail_user *mail_user = uctx->user;
+ struct imap_url *imap_url;
+ const char *error, *errormsg;
+
+ /* parse the url */
+ if (imap_url_parse(url, NULL, url_parse_flags, &imap_url, &error) < 0) {
+ errormsg = t_strdup_printf(
+ "Failed to fetch URLAUTH \"%s\": %s", url, error);
+ e_debug(mail_user->event, "%s", errormsg);
+ ufetch->pending_requests++;
+ imap_urlauth_fetch_ref(ufetch);
+ imap_urlauth_fetch_error(ufetch, url, url_flags, errormsg);
+ imap_urlauth_fetch_unref(&ufetch);
+ return 1;
+ }
+
+ return imap_urlauth_fetch_url_parsed(ufetch, url, imap_url, url_flags);
+}
+
+int imap_urlauth_fetch_url_parsed(struct imap_urlauth_fetch *ufetch,
+ const char *url, struct imap_url *imap_url,
+ enum imap_urlauth_fetch_flags url_flags)
+{
+ struct imap_urlauth_context *uctx = ufetch->uctx;
+ struct mail_user *mail_user = uctx->user;
+ const char *error, *errormsg;
+ int ret = 0;
+
+ ufetch->failed = FALSE;
+ ufetch->pending_requests++;
+
+ imap_urlauth_fetch_ref(ufetch);
+
+ /* if access user and target user match, handle fetch request locally */
+ if (imap_url->userid != NULL &&
+ strcmp(mail_user->username, imap_url->userid) == 0) {
+
+ if (ufetch->waiting_local) {
+ struct imap_urlauth_fetch_url *url_local;
+
+ url_local = i_new(struct imap_urlauth_fetch_url, 1);
+ url_local->url = i_strdup(url);
+ url_local->flags = url_flags;
+
+ DLLIST2_APPEND(&ufetch->local_urls_head,
+ &ufetch->local_urls_tail, url_local);
+ } else T_BEGIN {
+ imap_urlauth_fetch_local(ufetch, url,
+ url_flags, imap_url);
+ } T_END;
+ imap_url = NULL;
+ /* don't try to fetch remote URLs that are already known to fail access */
+ } else if (!imap_urlauth_check(uctx, imap_url, TRUE, &error)) {
+ errormsg = t_strdup_printf(
+ "Failed to fetch URLAUTH \"%s\": %s", url, error);
+ e_debug(mail_user->event, "%s", errormsg);
+ imap_urlauth_fetch_error(ufetch, url, url_flags, errormsg);
+ imap_url = NULL;
+ }
+
+ /* create request for url */
+ if (imap_url != NULL && imap_url->userid != NULL) {
+ i_assert(uctx->conn != NULL);
+ (void)imap_urlauth_request_new(uctx->conn, imap_url->userid,
+ url, url_flags,
+ imap_urlauth_fetch_request_callback, ufetch);
+ i_assert(uctx->conn != NULL);
+ if (imap_urlauth_connection_connect(uctx->conn) < 0)
+ ret = -1;
+ }
+ if (ret >= 0)
+ ret = (ufetch->pending_requests > 0 ? 0 : 1);
+
+ imap_urlauth_fetch_unref(&ufetch);
+ return ret;
+}
+
+static bool imap_urlauth_fetch_do_continue(struct imap_urlauth_fetch *ufetch)
+{
+ struct imap_urlauth_fetch_url *url, *url_next;
+ int ret;
+
+ if (ufetch->failed)
+ return FALSE;
+
+ if (!ufetch->waiting_local && !ufetch->waiting_service) {
+ /* not currently waiting for anything */
+ return ufetch->pending_requests > 0;
+ }
+
+ /* we finished a request */
+ ufetch->pending_requests--;
+
+ if (!ufetch->waiting_local) {
+ /* not waiting for local request handling */
+ ufetch->waiting_service = FALSE;
+ imap_urlauth_connection_continue(ufetch->uctx->conn);
+ return ufetch->pending_requests > 0;
+ }
+
+ /* finished local request */
+ if (ufetch->local_url != NULL) {
+ imap_msgpart_url_free(&ufetch->local_url);
+ }
+ ufetch->waiting_local = FALSE;
+
+ /* handle pending remote reply */
+ if (ufetch->pending_reply.url != NULL) {
+ struct imap_urlauth_fetch_reply reply;
+
+ ufetch->pending_requests--;
+
+ i_zero(&reply);
+ reply.url = ufetch->pending_reply.url;
+ reply.flags = ufetch->pending_reply.flags;
+ reply.bodypartstruct = ufetch->pending_reply.bodypartstruct;
+ reply.error = ufetch->pending_reply.error;
+ reply.input = ufetch->pending_reply.input;
+ reply.size = ufetch->pending_reply.size;
+ reply.succeeded = ufetch->pending_reply.succeeded;
+ reply.binary_has_nuls = ufetch->pending_reply.binary_has_nuls;
+
+ ret = ufetch->callback(&reply, ufetch->pending_requests == 0,
+ ufetch->context);
+
+ if (ufetch->pending_reply.url != NULL)
+ i_free(ufetch->pending_reply.url);
+ if (ufetch->pending_reply.input != NULL)
+ i_stream_unref(&ufetch->pending_reply.input);
+ if (ufetch->pending_reply.bodypartstruct != NULL)
+ i_free(ufetch->pending_reply.bodypartstruct);
+ if (ufetch->pending_reply.error != NULL)
+ i_free(ufetch->pending_reply.error);
+
+ if (ret < 0) {
+ imap_urlauth_fetch_fail(ufetch);
+ return FALSE;
+ }
+
+ if (ret == 0) {
+ ufetch->waiting_service = TRUE;
+ ufetch->pending_requests++;
+ return TRUE;
+ }
+
+ ufetch->waiting_service = FALSE;
+ imap_urlauth_connection_continue(ufetch->uctx->conn);
+ }
+
+ /* handle pending local urls */
+ url = ufetch->local_urls_head;
+ while (url != NULL) {
+ url_next = url->next;
+ T_BEGIN {
+ imap_urlauth_fetch_local(ufetch, url->url,
+ url->flags, NULL);
+ } T_END;
+ DLLIST2_REMOVE(&ufetch->local_urls_head,
+ &ufetch->local_urls_tail, url);
+ i_free(url->url);
+ i_free(url);
+ if (ufetch->waiting_local)
+ return TRUE;
+ url = url_next;
+ }
+
+ return ufetch->pending_requests > 0;
+}
+
+bool imap_urlauth_fetch_continue(struct imap_urlauth_fetch *ufetch)
+{
+ bool pending;
+
+ imap_urlauth_fetch_ref(ufetch);
+ pending = imap_urlauth_fetch_do_continue(ufetch);
+ imap_urlauth_fetch_unref(&ufetch);
+
+ return pending;
+}
+
+bool imap_urlauth_fetch_is_pending(struct imap_urlauth_fetch *ufetch)
+{
+ return ufetch->pending_requests > 0;
+}
diff --git a/src/lib-imap-urlauth/imap-urlauth-fetch.h b/src/lib-imap-urlauth/imap-urlauth-fetch.h
new file mode 100644
index 0000000..628a95e
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth-fetch.h
@@ -0,0 +1,56 @@
+#ifndef IMAP_URLAUTH_FETCH_H
+#define IMAP_URLAUTH_FETCH_H
+
+struct imap_url;
+struct imap_urlauth_context;
+struct imap_urlauth_fetch;
+
+enum imap_urlauth_fetch_flags {
+ /* Indicates that this is an extended request */
+ IMAP_URLAUTH_FETCH_FLAG_EXTENDED = 0x01,
+ /* Fetch body part unmodified */
+ IMAP_URLAUTH_FETCH_FLAG_BODY = 0x02,
+ /* Fetch body part as binary, i.e. without content encoding */
+ IMAP_URLAUTH_FETCH_FLAG_BINARY = 0x04,
+ /* Fetch IMAP bodypartstructure */
+ IMAP_URLAUTH_FETCH_FLAG_BODYPARTSTRUCTURE = 0x08,
+};
+
+struct imap_urlauth_fetch_reply {
+ const char *url;
+ enum imap_urlauth_fetch_flags flags;
+
+ struct istream *input;
+ uoff_t size;
+
+ const char *bodypartstruct;
+ const char *error;
+
+ bool succeeded:1;
+ bool binary_has_nuls:1;
+};
+
+/* Callback to handle fetch reply. Returns 1 if handled completely and ready
+ for next reply, 0 if not all data was processed, and -1 for error. If a
+ callback returns 0, imap_urlauth_fetch_continue() must be called once
+ new replies may be processed. If this is the last request to yield a reply,
+ argument last is TRUE. */
+typedef int
+imap_urlauth_fetch_callback_t(struct imap_urlauth_fetch_reply *reply,
+ bool last, void *context);
+
+struct imap_urlauth_fetch *
+imap_urlauth_fetch_init(struct imap_urlauth_context *uctx,
+ imap_urlauth_fetch_callback_t *callback, void *context);
+void imap_urlauth_fetch_deinit(struct imap_urlauth_fetch **ufetch);
+
+int imap_urlauth_fetch_url(struct imap_urlauth_fetch *ufetch, const char *url,
+ enum imap_urlauth_fetch_flags url_flags);
+int imap_urlauth_fetch_url_parsed(struct imap_urlauth_fetch *ufetch,
+ const char *url, struct imap_url *imap_url,
+ enum imap_urlauth_fetch_flags url_flags);
+
+bool imap_urlauth_fetch_continue(struct imap_urlauth_fetch *ufetch);
+bool imap_urlauth_fetch_is_pending(struct imap_urlauth_fetch *ufetch);
+
+#endif
diff --git a/src/lib-imap-urlauth/imap-urlauth-private.h b/src/lib-imap-urlauth/imap-urlauth-private.h
new file mode 100644
index 0000000..3b3622c
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth-private.h
@@ -0,0 +1,20 @@
+#ifndef IMAP_URLAUTH_PRIVATE_H
+#define IMAP_URLAUTH_PRIVATE_H
+
+#include "imap-urlauth.h"
+
+struct imap_urlauth_context {
+ struct mail_user *user;
+ struct imap_urlauth_connection *conn;
+
+ char *url_host;
+ in_port_t url_port;
+
+ char *access_user;
+ char *access_service;
+ const char **access_applications;
+
+ bool access_anonymous:1;
+};
+
+#endif
diff --git a/src/lib-imap-urlauth/imap-urlauth.c b/src/lib-imap-urlauth/imap-urlauth.c
new file mode 100644
index 0000000..a9c2673
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth.c
@@ -0,0 +1,486 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "hostpid.h"
+#include "var-expand.h"
+#include "hmac.h"
+#include "sha1.h"
+#include "randgen.h"
+#include "safe-memset.h"
+#include "mail-storage.h"
+#include "mail-storage-service.h"
+#include "mail-namespace.h"
+#include "mail-user.h"
+#include "imap-url.h"
+#include "imap-msgpart-url.h"
+#include "imap-urlauth-backend.h"
+#include "imap-urlauth-fetch.h"
+#include "imap-urlauth-connection.h"
+
+#include "imap-urlauth-private.h"
+
+#include <time.h>
+
+#define IMAP_URLAUTH_MECH_INTERNAL_VERSION 0x01
+
+#define IMAP_URLAUTH_NORMAL_TIMEOUT_MSECS 5*1000
+#define IMAP_URLAUTH_SPECIAL_TIMEOUT_MSECS 3*60*1000
+
+#define URL_HOST_ALLOW_ANY "*"
+
+struct imap_urlauth_context *
+imap_urlauth_init(struct mail_user *user,
+ const struct imap_urlauth_config *config)
+{
+ struct imap_urlauth_context *uctx;
+ unsigned int timeout;
+
+ i_assert(*config->url_host != '\0');
+
+ uctx = i_new(struct imap_urlauth_context, 1);
+ uctx->user = user;
+ uctx->url_host = i_strdup(config->url_host);
+ uctx->url_port = config->url_port;
+
+ if (config->access_anonymous)
+ uctx->access_user = i_strdup("anonymous");
+ else
+ uctx->access_user = i_strdup(config->access_user);
+ uctx->access_service = i_strdup(config->access_service);
+ uctx->access_anonymous = config->access_anonymous;
+ if (config->access_applications != NULL &&
+ *config->access_applications != NULL) {
+ uctx->access_applications =
+ p_strarray_dup(default_pool,
+ config->access_applications);
+ timeout = IMAP_URLAUTH_SPECIAL_TIMEOUT_MSECS;
+ } else {
+ timeout = IMAP_URLAUTH_NORMAL_TIMEOUT_MSECS;
+ }
+
+ if (config->socket_path != NULL) {
+ uctx->conn = imap_urlauth_connection_init(config->socket_path,
+ config->access_service, user, config->session_id, timeout);
+ }
+ return uctx;
+}
+
+void imap_urlauth_deinit(struct imap_urlauth_context **_uctx)
+{
+ struct imap_urlauth_context *uctx = *_uctx;
+
+ *_uctx = NULL;
+
+ if (uctx->conn != NULL)
+ imap_urlauth_connection_deinit(&uctx->conn);
+ i_free(uctx->url_host);
+ i_free(uctx->access_user);
+ i_free(uctx->access_service);
+ i_free(uctx->access_applications);
+ i_free(uctx);
+}
+
+static const unsigned char *
+imap_urlauth_internal_generate(const char *rumpurl,
+ const unsigned char mailbox_key[IMAP_URLAUTH_KEY_LEN],
+ size_t *token_len_r)
+{
+ struct hmac_context hmac;
+ unsigned char *token;
+
+ token = t_new(unsigned char, SHA1_RESULTLEN + 1);
+ token[0] = IMAP_URLAUTH_MECH_INTERNAL_VERSION;
+
+ hmac_init(&hmac, mailbox_key, IMAP_URLAUTH_KEY_LEN, &hash_method_sha1);
+ hmac_update(&hmac, rumpurl, strlen(rumpurl));
+ hmac_final(&hmac, token+1);
+
+ *token_len_r = SHA1_RESULTLEN + 1;
+ return token;
+}
+
+static bool
+imap_urlauth_internal_verify(const char *rumpurl,
+ const unsigned char mailbox_key[IMAP_URLAUTH_KEY_LEN],
+ const unsigned char *token, size_t token_len)
+{
+ const unsigned char *valtoken;
+ size_t valtoken_len;
+
+ if (rumpurl == NULL || token == NULL)
+ return FALSE;
+
+ valtoken = imap_urlauth_internal_generate(rumpurl, mailbox_key,
+ &valtoken_len);
+ /* Note: the token length has timing leak here in any case */
+ if (token_len != valtoken_len)
+ return FALSE;
+
+ return mem_equals_timing_safe(token, valtoken, valtoken_len);
+}
+
+static bool
+access_applications_have_access(struct imap_urlauth_context *uctx,
+ struct imap_url *url, const char *const *access_applications)
+{
+ const char *const *application;
+
+ if (access_applications == NULL)
+ return FALSE;
+
+ application = access_applications;
+ for (; *application != NULL; application++) {
+ const char *app = *application;
+ bool have_userid = FALSE;
+ size_t len = strlen(app);
+
+ if (app[len-1] == '+')
+ have_userid = TRUE;
+
+ if (strncasecmp(url->uauth_access_application, app, len-1) == 0) {
+ if (!have_userid) {
+ /* this access application must have no userid */
+ return url->uauth_access_user == NULL;
+ }
+
+ /* this access application must have a userid */
+ return (!uctx->access_anonymous && url->uauth_access_user != NULL);
+ }
+ }
+ return FALSE;
+}
+
+static bool
+imap_urlauth_check_access(struct imap_urlauth_context *uctx,
+ struct imap_url *url, bool ignore_unknown,
+ const char **error_r)
+{
+ const char *userid;
+
+ if (url->uauth_access_application == NULL) {
+ *error_r = "URL is missing URLAUTH";
+ return FALSE;
+ }
+
+ if (strcmp(uctx->access_service, "imap") == 0) {
+ /* these access types are only allowed if URL is accessed through imap */
+ if (strcasecmp(url->uauth_access_application, "user") == 0) {
+ /* user+<access_user> */
+ if (url->uauth_access_user == NULL) {
+ *error_r = "URLAUTH `user' access is missing userid";
+ return FALSE;
+ }
+ if (!uctx->access_anonymous ||
+ strcasecmp(url->uauth_access_user, uctx->access_user) == 0)
+ return TRUE;
+ } else if (strcasecmp(url->uauth_access_application, "authuser") == 0) {
+ /* authuser */
+ if (!uctx->access_anonymous)
+ return TRUE;
+ } else if (strcasecmp(url->uauth_access_application, "anonymous") == 0) {
+ /* anonymous */
+ return TRUE;
+ } else if (ignore_unknown || access_applications_have_access
+ (uctx, url, uctx->access_applications)) {
+ return TRUE;
+ }
+ } else if (strcmp(uctx->access_service, "submission") == 0) {
+ /* accessed directly through submission service */
+
+ if (strcasecmp(url->uauth_access_application, "submit") != 0) {
+ userid = url->uauth_access_user == NULL ? "" :
+ t_strdup_printf("+%s", url->uauth_access_user);
+ *error_r = t_strdup_printf(
+ "No '%s%s' access allowed for submission service",
+ url->uauth_access_application, userid);
+ return FALSE;
+ } else if (url->uauth_access_user == NULL) {
+ *error_r = "URLAUTH `submit' access is missing userid";
+ return FALSE;
+ } else if (!uctx->access_anonymous &&
+ strcasecmp(url->uauth_access_user, uctx->access_user) == 0) {
+ return TRUE;
+ }
+ }
+
+ userid = url->uauth_access_user == NULL ? "" :
+ t_strdup_printf("+%s", url->uauth_access_user);
+
+ if (uctx->access_anonymous) {
+ *error_r = t_strdup_printf(
+ "No '%s%s' access allowed for anonymous user",
+ url->uauth_access_application, userid);
+ } else {
+ *error_r = t_strdup_printf(
+ "No '%s%s' access allowed for user %s",
+ url->uauth_access_application, userid, uctx->access_user);
+ }
+ return FALSE;
+}
+
+static bool
+imap_urlauth_check_hostport(struct imap_urlauth_context *uctx,
+ struct imap_url *url, const char **client_error_r)
+{
+ /* validate host */
+ /* FIXME: allow host ip/ip6 as well? */
+ if (strcmp(uctx->url_host, URL_HOST_ALLOW_ANY) != 0 &&
+ strcmp(url->host.name, uctx->url_host) != 0) {
+ *client_error_r = "Invalid URL: Inappropriate host name";
+ return FALSE;
+ }
+
+ /* validate port */
+ if ((url->port == 0 && uctx->url_port != 143) ||
+ (url->port != 0 && uctx->url_port != url->port)) {
+ *client_error_r = "Invalid URL: Inappropriate server port";
+ return FALSE;
+ }
+ return TRUE;
+}
+
+int imap_urlauth_generate(struct imap_urlauth_context *uctx,
+ const char *mechanism, const char *rumpurl,
+ const char **urlauth_r, const char **client_error_r)
+{
+ struct mail_user *user = uctx->user;
+ enum imap_url_parse_flags url_flags =
+ IMAP_URL_PARSE_ALLOW_URLAUTH;
+ struct imap_url *url;
+ struct imap_msgpart_url *mpurl = NULL;
+ struct mailbox *box;
+ const char *error;
+ enum mail_error error_code;
+ unsigned char mailbox_key[IMAP_URLAUTH_KEY_LEN];
+ const unsigned char *token;
+ size_t token_len;
+ int ret;
+
+ /* validate mechanism */
+ if (strcasecmp(mechanism, "INTERNAL") != 0) {
+ *client_error_r = t_strdup_printf("Unsupported URLAUTH mechanism: %s", mechanism);
+ return 0;
+ }
+
+ /* validate URL */
+ if (imap_url_parse(rumpurl, NULL, url_flags, &url, &error) < 0) {
+ *client_error_r = t_strdup_printf("Invalid URL: %s", error);
+ return 0;
+ }
+
+ if (url->mailbox == NULL || url->uid == 0 || url->search_program != NULL ||
+ url->uauth_rumpurl == NULL || url->uauth_mechanism != NULL) {
+ *client_error_r = "Invalid URL: Must be an URLAUTH rump URL";
+ return 0;
+ }
+
+ /* validate expiry time */
+ if (url->uauth_expire != (time_t)-1) {
+ time_t now = time(NULL);
+
+ if (now > url->uauth_expire) {
+ *client_error_r = t_strdup_printf("URLAUTH has already expired");
+ return 0;
+ }
+ }
+
+ /* validate user */
+ if (url->userid == NULL) {
+ *client_error_r = "Invalid URL: Missing user name";
+ return 0;
+ }
+ if (user->anonymous || strcmp(url->userid, user->username) != 0) {
+ *client_error_r = t_strdup_printf(
+ "Not permitted to generate URLAUTH for user %s",
+ url->userid);
+ return 0;
+ }
+
+ /* validate host:port */
+ if (!imap_urlauth_check_hostport(uctx, url, client_error_r))
+ return 0;
+
+ /* validate mailbox */
+ if ((ret = imap_msgpart_url_create(user, url, &mpurl, &error)) < 0 ||
+ imap_msgpart_url_verify(mpurl, &error) <= 0) {
+ *client_error_r = t_strdup_printf("Invalid URL: %s", error);
+ if (mpurl != NULL)
+ imap_msgpart_url_free(&mpurl);
+ return ret;
+ }
+ box = imap_msgpart_url_get_mailbox(mpurl);
+
+ /* obtain mailbox key */
+ ret = imap_urlauth_backend_get_mailbox_key(box, TRUE, mailbox_key,
+ client_error_r, &error_code);
+ if (ret < 0) {
+ imap_msgpart_url_free(&mpurl);
+ return ret;
+ }
+
+ token = imap_urlauth_internal_generate(rumpurl, mailbox_key, &token_len);
+ imap_msgpart_url_free(&mpurl);
+
+ *urlauth_r = imap_url_add_urlauth(rumpurl, mechanism, token, token_len);
+ return 1;
+}
+
+bool imap_urlauth_check(struct imap_urlauth_context *uctx,
+ struct imap_url *url, bool ignore_unknown_access,
+ const char **error_r)
+{
+ /* validate URL fields */
+ if (url->mailbox == NULL || url->uid == 0 ||
+ url->search_program != NULL || url->uauth_rumpurl == NULL ||
+ url->uauth_mechanism == NULL) {
+ *error_r = "Invalid URL: Must be a full URLAUTH URL";
+ return FALSE;
+ }
+
+ /* check presence of userid */
+ if (url->userid == NULL) {
+ *error_r = "Invalid URLAUTH: Missing user name";
+ return FALSE;
+ }
+
+ /* validate mechanism */
+ if (strcasecmp(url->uauth_mechanism, "INTERNAL") != 0) {
+ *error_r = t_strdup_printf("Unsupported URLAUTH mechanism: %s",
+ url->uauth_mechanism);
+ return FALSE;
+ }
+
+ /* validate expiry time */
+ if (url->uauth_expire != (time_t)-1) {
+ time_t now = time(NULL);
+
+ if (now > url->uauth_expire) {
+ *error_r = t_strdup_printf("URLAUTH has expired");
+ return FALSE;
+ }
+ }
+
+ /* validate access */
+ if (!imap_urlauth_check_access(uctx, url, ignore_unknown_access,
+ error_r))
+ return FALSE;
+ /* validate host:port */
+ if (!imap_urlauth_check_hostport(uctx, url, error_r))
+ return FALSE;
+ return TRUE;
+}
+
+int imap_urlauth_fetch_parsed(struct imap_urlauth_context *uctx,
+ struct imap_url *url,
+ struct imap_msgpart_url **mpurl_r,
+ enum mail_error *error_code_r,
+ const char **error_r)
+{
+ struct mail_user *user = uctx->user;
+ struct imap_msgpart_url *mpurl;
+ struct mailbox *box;
+ const char *error;
+ unsigned char mailbox_key[IMAP_URLAUTH_KEY_LEN];
+ int ret;
+
+ *mpurl_r = NULL;
+ *error_r = NULL;
+ *error_code_r = MAIL_ERROR_NONE;
+
+ /* check urlauth mechanism, access, userid and authority */
+ if (!imap_urlauth_check(uctx, url, FALSE, error_r)) {
+ *error_code_r = MAIL_ERROR_PARAMS;
+ return 0;
+ }
+
+ /* validate target user */
+ if (user->anonymous || strcmp(url->userid, user->username) != 0) {
+ *error_r = t_strdup_printf("Not permitted to fetch URLAUTH for user %s",
+ url->userid);
+ *error_code_r = MAIL_ERROR_PARAMS;
+ return 0;
+ }
+
+ /* validate mailbox */
+ if ((ret = imap_msgpart_url_create(user, url, &mpurl, &error)) < 0) {
+ *error_r = t_strdup_printf("Invalid URLAUTH: %s", error);
+ *error_code_r = MAIL_ERROR_PARAMS;
+ return ret;
+ }
+
+ if ((ret = imap_msgpart_url_open_mailbox(mpurl, &box, error_code_r,
+ &error)) < 0) {
+ *error_r = "Internal server error";
+ imap_msgpart_url_free(&mpurl);
+ return -1;
+ }
+
+ if (ret == 0) {
+ /* RFC says: `If the mailbox cannot be identified, an
+ authorization token is calculated on the rump URL, using
+ random "plausible" keys (selected by the server) as needed,
+ before returning a validation failure. This prevents timing
+ attacks aimed at identifying mailbox names.' */
+ random_fill(mailbox_key, sizeof(mailbox_key));
+ (void)imap_urlauth_internal_verify(url->uauth_rumpurl,
+ mailbox_key, url->uauth_token, url->uauth_token_size);
+
+ *error_r = t_strdup_printf("Invalid URLAUTH: %s", error);
+ imap_msgpart_url_free(&mpurl);
+ return 0;
+ }
+
+ /* obtain mailbox key */
+ ret = imap_urlauth_backend_get_mailbox_key(box, FALSE, mailbox_key,
+ error_r, error_code_r);
+ if (ret < 0) {
+ imap_msgpart_url_free(&mpurl);
+ return -1;
+ }
+
+ if (ret == 0 ||
+ !imap_urlauth_internal_verify(url->uauth_rumpurl, mailbox_key,
+ url->uauth_token,
+ url->uauth_token_size)) {
+ *error_r = "URLAUTH verification failed";
+ *error_code_r = MAIL_ERROR_PERM;
+ imap_msgpart_url_free(&mpurl);
+ ret = 0;
+ } else {
+ ret = 1;
+ }
+
+ safe_memset(mailbox_key, 0, sizeof(mailbox_key));
+ *mpurl_r = mpurl;
+ return ret;
+}
+
+int imap_urlauth_fetch(struct imap_urlauth_context *uctx,
+ const char *urlauth, struct imap_msgpart_url **mpurl_r,
+ enum mail_error *error_code_r, const char **error_r)
+{
+ struct imap_url *url;
+ enum imap_url_parse_flags url_flags = IMAP_URL_PARSE_ALLOW_URLAUTH;
+ const char *error;
+
+ /* validate URL */
+ if (imap_url_parse(urlauth, NULL, url_flags, &url, &error) < 0) {
+ *error_r = t_strdup_printf("Invalid URLAUTH: %s", error);
+ *error_code_r = MAIL_ERROR_PARAMS;
+ return 0;
+ }
+
+ return imap_urlauth_fetch_parsed(uctx, url, mpurl_r,
+ error_code_r, error_r);
+}
+
+int imap_urlauth_reset_mailbox_key(struct imap_urlauth_context *uctx ATTR_UNUSED,
+ struct mailbox *box)
+{
+ return imap_urlauth_backend_reset_mailbox_key(box);
+}
+
+int imap_urlauth_reset_all_keys(struct imap_urlauth_context *uctx)
+{
+ return imap_urlauth_backend_reset_all_keys(uctx->user);
+}
diff --git a/src/lib-imap-urlauth/imap-urlauth.h b/src/lib-imap-urlauth/imap-urlauth.h
new file mode 100644
index 0000000..9c7c30f
--- /dev/null
+++ b/src/lib-imap-urlauth/imap-urlauth.h
@@ -0,0 +1,55 @@
+#ifndef IMAP_URLAUTH_H
+#define IMAP_URLAUTH_H
+
+#include "net.h"
+
+#define IMAP_URLAUTH_SOCKET_NAME "imap-urlauth"
+
+struct imap_url;
+struct imap_msgpart_url;
+struct imap_urlauth_context;
+
+struct imap_urlauth_config {
+ const char *url_host;
+ in_port_t url_port;
+
+ const char *socket_path;
+ const char *session_id;
+
+ /* the user who is requesting access to URLAUTHs */
+ const char *access_user;
+ /* ... is using this service (i.e. imap or submission) */
+ const char *access_service;
+ /* ... represents these applications */
+ const char *const *access_applications;
+ /* ... is anonymous? */
+ bool access_anonymous;
+};
+
+struct imap_urlauth_context *
+imap_urlauth_init(struct mail_user *user,
+ const struct imap_urlauth_config *config);
+void imap_urlauth_deinit(struct imap_urlauth_context **_uctx);
+
+int imap_urlauth_generate(struct imap_urlauth_context *uctx,
+ const char *mechanism, const char *rumpurl,
+ const char **urlauth_r, const char **client_error_r);
+
+bool imap_urlauth_check(struct imap_urlauth_context *uctx,
+ struct imap_url *url, bool ignore_unknown_access,
+ const char **error_r);
+
+int imap_urlauth_fetch_parsed(struct imap_urlauth_context *uctx,
+ struct imap_url *url,
+ struct imap_msgpart_url **mpurl_r,
+ enum mail_error *error_code_r,
+ const char **error_r);
+int imap_urlauth_fetch(struct imap_urlauth_context *uctx,
+ const char *urlauth, struct imap_msgpart_url **mpurl_r,
+ enum mail_error *error_code_r, const char **error_r);
+
+int imap_urlauth_reset_mailbox_key(struct imap_urlauth_context *uctx,
+ struct mailbox *box);
+int imap_urlauth_reset_all_keys(struct imap_urlauth_context *uctx);
+
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-07 02:42:51 +0000