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From 61bfa0ce515288897b93640507e48f09f0d78010 Mon Sep 17 00:00:00 2001
From: wujing <wujing50@huawei.com>
Date: Tue, 14 Apr 2020 23:17:04 -0400
Subject: [PATCH 26/49] Supporting UID GID configuration
Signed-off-by: wujing <wujing50@huawei.com>
---
src/lxc/attach.c | 16 ++++++++
src/lxc/conf.c | 19 ++++++++-
src/lxc/conf.h | 4 ++
src/lxc/start.c | 8 ++++
src/lxc/tools/lxc_attach.c | 99 +++++++++++++++++++++++++++++++++++++++++++---
5 files changed, 139 insertions(+), 7 deletions(-)
diff --git a/src/lxc/attach.c b/src/lxc/attach.c
index 33946bb..c77b929 100644
--- a/src/lxc/attach.c
+++ b/src/lxc/attach.c
@@ -749,8 +749,10 @@ static int attach_child_main(struct attach_clone_payload *payload)
goto on_error;
}
+#ifndef HAVE_ISULAD
if (!lxc_setgroups(0, NULL) && errno != EPERM)
goto on_error;
+#endif
if (options->namespaces & CLONE_NEWUSER) {
/* Check whether nsuid 0 has a mapping. */
@@ -892,6 +894,12 @@ static int attach_child_main(struct attach_clone_payload *payload)
if (new_gid == ns_root_gid)
new_gid = LXC_INVALID_GID;
+#ifdef HAVE_ISULAD
+ if (!lxc_setgroups(init_ctx->container->lxc_conf->init_groups_len,
+ init_ctx->container->lxc_conf->init_groups))
+ goto on_error;
+#endif
+
/* Make sure that the processes STDIO is correctly owned by the user that we are switching to */
ret = fix_stdio_permissions(new_uid);
if (ret)
@@ -1058,6 +1066,14 @@ int lxc_attach(struct lxc_container *container, lxc_attach_exec_t exec_function,
}
conf = init_ctx->container->lxc_conf;
+#ifdef HAVE_ISULAD
+ // always switch uid and gid for attach
+ if (options->uid == -1)
+ options->uid = init_ctx->container->lxc_conf->init_uid;
+ if (options->gid == -1)
+ options->gid = init_ctx->container->lxc_conf->init_gid;
+#endif
+
if (!fetch_seccomp(init_ctx->container, options))
WARN("Failed to get seccomp policy");
diff --git a/src/lxc/conf.c b/src/lxc/conf.c
index 71fd6f9..43ef067 100644
--- a/src/lxc/conf.c
+++ b/src/lxc/conf.c
@@ -5100,6 +5100,7 @@ void lxc_conf_free(struct lxc_conf *conf)
close(conf->exit_fd);
}
lxc_clear_init_args(conf);
+ lxc_clear_init_groups(conf);
lxc_clear_populate_devices(conf);
lxc_clear_rootfs_masked_paths(conf);
lxc_clear_rootfs_ro_paths(conf);
@@ -5919,11 +5920,25 @@ struct lxc_list *sort_cgroup_settings(struct lxc_list *cgroup_settings)
/*isulad clear init args*/
int lxc_clear_init_args(struct lxc_conf *lxc_conf)
{
- size_t i;
+ int i;
- for (i = 0; i < lxc_conf->init_argc; i++)
+ for (i = 0; i < lxc_conf->init_argc; i++) {
free(lxc_conf->init_argv[i]);
+ lxc_conf->init_argv[i] = NULL;
+ }
free(lxc_conf->init_argv);
+ lxc_conf->init_argv = NULL;
+ lxc_conf->init_argc = 0;
+
+ return 0;
+}
+
+/*isulad clear init groups*/
+int lxc_clear_init_groups(struct lxc_conf *lxc_conf)
+{
+ free(lxc_conf->init_groups);
+ lxc_conf->init_groups = NULL;
+ lxc_conf->init_groups_len = 0;
return 0;
}
diff --git a/src/lxc/conf.h b/src/lxc/conf.h
index 61c3383..879e427 100644
--- a/src/lxc/conf.h
+++ b/src/lxc/conf.h
@@ -451,6 +451,9 @@ struct lxc_conf {
char **init_argv;
size_t init_argc;
+ gid_t *init_groups;
+ size_t init_groups_len;
+
/* populate devices*/
struct lxc_list populate_devs;
mode_t umask; //umask value
@@ -548,6 +551,7 @@ extern int parse_mntopts(const char *mntopts, unsigned long *mntflags,
#ifdef HAVE_ISULAD
// isulad add
int lxc_clear_init_args(struct lxc_conf *lxc_conf);
+int lxc_clear_init_groups(struct lxc_conf *lxc_conf);
int lxc_clear_populate_devices(struct lxc_conf *c);
int lxc_clear_rootfs_masked_paths(struct lxc_conf *c);
int lxc_clear_rootfs_ro_paths(struct lxc_conf *c);
diff --git a/src/lxc/start.c b/src/lxc/start.c
index 4f45776..e2311ec 100644
--- a/src/lxc/start.c
+++ b/src/lxc/start.c
@@ -1685,8 +1685,16 @@ static int do_start(void *data)
#if HAVE_LIBCAP
if (lxc_proc_cap_is_set(CAP_SETGID, CAP_EFFECTIVE))
#endif
+ #ifdef HAVE_ISULAD
+ /* isulad: set groups for init process, and before we set uid and gid */
+ if (!lxc_setgroups(handler->conf->init_groups_len, handler->conf->init_groups)) {
+ ERROR("Can not set groups");
+ goto out_warn_father;
+ }
+ #else
if (!lxc_setgroups(0, NULL))
goto out_warn_father;
+ #endif
if (!lxc_switch_uid_gid(new_uid, new_gid))
goto out_warn_father;
diff --git a/src/lxc/tools/lxc_attach.c b/src/lxc/tools/lxc_attach.c
index 47ac2f2..b068c9a 100644
--- a/src/lxc/tools/lxc_attach.c
+++ b/src/lxc/tools/lxc_attach.c
@@ -72,9 +72,11 @@ static const struct option my_longopts[] = {
{"set-var", required_argument, 0, 'v'},
{"pty-log", required_argument, 0, 'L'},
{"rcfile", required_argument, 0, 'f'},
+#ifndef HAVE_ISULAD
{"uid", required_argument, 0, 'u'},
{"gid", required_argument, 0, 'g'},
-#ifdef HAVE_ISULAD
+#else
+ {"user", required_argument, 0, 'u'},
{"in-fifo", required_argument, 0, OPT_INPUT_FIFO}, /* isulad add terminal fifos*/
{"out-fifo", required_argument, 0, OPT_OUTPUT_FIFO},
{"err-fifo", required_argument, 0, OPT_STDERR_FIFO},
@@ -130,9 +132,18 @@ Options :\n\
multiple times.\n\
-f, --rcfile=FILE\n\
Load configuration file FILE\n\
+"
+#ifndef HAVE_ISULAD
+"\
-u, --uid=UID Execute COMMAND with UID inside the container\n\
-g, --gid=GID Execute COMMAND with GID inside the container\n\
-",
+"
+#else
+"\
+ --user User ID (format: UID[:GID])\n\
+"
+#endif
+,
.options = my_longopts,
.parser = my_parser,
.checker = NULL,
@@ -142,6 +153,71 @@ Options :\n\
.gid = LXC_INVALID_GID,
};
+#ifdef HAVE_ISULAD
+static int parse_user_id(const char *username, char **uid, char **gid, char **tmp_dup)
+{
+ char *tmp = NULL;
+ char *pdot = NULL;
+
+ if (uid == NULL || gid == NULL || tmp_dup == NULL) {
+ return -1;
+ }
+
+ if (username != NULL) {
+ tmp = strdup(username);
+ if (tmp == NULL) {
+ ERROR("Failed to duplicate user name");
+ return -1;
+ }
+
+ // for free tmp in caller
+ *tmp_dup = tmp;
+ pdot = strstr(tmp, ":");
+ if (pdot != NULL) {
+ *pdot = '\0';
+ if (pdot != tmp) {
+ // uid found
+ *uid = tmp;
+ }
+
+ if (*(pdot + 1) != '\0') {
+ // gid found
+ *gid = pdot + 1;
+ }
+ } else {
+ // No : found
+ if (*tmp != '\0') {
+ *uid = tmp;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int get_attach_uid_gid(const char *username, uid_t *user_id, gid_t *group_id)
+{
+ char *tmp = NULL;
+ char *uid = NULL;
+ char *gid = NULL;
+
+ // parse uid and gid by username
+ if (parse_user_id(username, &uid, &gid, &tmp) != 0) {
+ return -1;
+ }
+
+ if (uid != NULL) {
+ *user_id = (unsigned int)atoll(uid);
+ }
+ if (gid != NULL) {
+ *group_id = (unsigned int)atoll(gid);
+ }
+
+ free(tmp);
+ return 0;
+}
+#endif
+
static int my_parser(struct lxc_arguments *args, int c, char *arg)
{
int ret;
@@ -199,6 +275,7 @@ static int my_parser(struct lxc_arguments *args, int c, char *arg)
case 'f':
args->rcfile = arg;
break;
+#ifndef HAVE_ISULAD
case 'u':
if (lxc_safe_uint(arg, &args->uid) < 0)
return -1;
@@ -207,7 +284,13 @@ static int my_parser(struct lxc_arguments *args, int c, char *arg)
if (lxc_safe_uint(arg, &args->gid) < 0)
return -1;
break;
-#ifdef HAVE_ISULAD
+#else
+ case 'u':
+ if (get_attach_uid_gid(arg, &args->uid, &args->gid) != 0) {
+ ERROR("Failed to get attach user U/GID");
+ return -1;
+ }
+ break;
case OPT_INPUT_FIFO:
args->terminal_fifos[0] = arg;
break;
@@ -286,7 +369,7 @@ static int lxc_attach_create_log_file(const char *log_file)
#ifdef HAVE_ISULAD
// isulad: send '128 + signal' if container is killed by signal.
-#define ExitSignalOffset 128
+#define EXIT_SIGNAL_OFFSET 128
/*isulad: attach with terminal*/
static int do_attach_foreground(struct lxc_container *c, lxc_attach_command_t *command,
@@ -316,7 +399,7 @@ static int do_attach_foreground(struct lxc_container *c, lxc_attach_command_t *c
if (WIFSIGNALED(ret)) {
signal = WTERMSIG(ret);
- wexit = ExitSignalOffset + signal;
+ wexit = EXIT_SIGNAL_OFFSET + signal;
}
out:
if (c->lxc_conf->errmsg)
@@ -515,6 +598,12 @@ int main(int argc, char *argv[])
}
}
+ if (my_args.uid != LXC_INVALID_UID)
+ attach_options.uid = my_args.uid;
+
+ if (my_args.gid != LXC_INVALID_GID)
+ attach_options.gid = my_args.gid;
+
attach_options.suffix = my_args.suffix;
/* isulad: add do attach background */
--
1.8.3.1
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