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From 88d2ec272d3e503412e477d9abaebfe2ca199e78 Mon Sep 17 00:00:00 2001
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From: Filipe Brandenburger <filbranden@google.com>
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Date: Sun, 6 Sep 2015 23:06:53 -0700
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Subject: [PATCH] execute: Add new PassEnvironment= directive
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This directive allows passing environment variables from the system
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manager to spawned services. Variables in the system manager can be set
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inside a container by passing `--set-env=...` options to systemd-spawn.
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Tested with an on-disk test.service unit. Tested using multiple variable
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names on a single line, with an empty setting to clear the current list
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of variables, with non-existing variables.
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Tested using `systemd-run -p PassEnvironment=VARNAME` to confirm it
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works with transient units.
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Confirmed that `systemctl show` will display the PassEnvironment
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settings.
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Checked that man pages are generated correctly.
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No regressions in `make check`.
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(cherry picked from commit b4c14404b3e8753c41bac0b1d49369230a15c544)
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Resolves: #1426214
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---
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 man/systemd.exec.xml                  | 27 +++++++++++
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 shell-completion/bash/systemd-run     |  2 +-
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 src/core/dbus-execute.c               | 34 ++++++++++++++
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 src/core/execute.c                    | 44 +++++++++++++++++-
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 src/core/execute.h                    |  1 +
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 src/core/load-fragment-gperf.gperf.m4 |  1 +
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 src/core/load-fragment.c              | 65 +++++++++++++++++++++++++++
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 src/core/load-fragment.h              |  1 +
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 src/libsystemd/sd-bus/bus-util.c      |  2 +-
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 src/shared/env-util.c                 | 15 +++++++
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 src/shared/env-util.h                 |  1 +
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 11 files changed, 189 insertions(+), 4 deletions(-)
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diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
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index c5199d3a5..aa5831cc2 100644
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--- a/man/systemd.exec.xml
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+++ b/man/systemd.exec.xml
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@@ -293,6 +293,33 @@
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         earlier setting.</para></listitem>
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       </varlistentry>
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+      <varlistentry>
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+        <term><varname>PassEnvironment=</varname></term>
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+
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+        <listitem><para>Pass environment variables from the systemd system
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+        manager to executed processes. Takes a space-separated list of variable
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+        names. This option may be specified more than once, in which case all
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+        listed variables will be set. If the empty string is assigned to this
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+        option, the list of environment variables is reset, all prior
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+        assignments have no effect. Variables that are not set in the system
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+        manager will not be passed and will be silently ignored.</para>
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+
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+        <para>Variables passed from this setting are overridden by those passed
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+        from <varname>Environment=</varname> or
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+        <varname>EnvironmentFile=</varname>.</para>
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+
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+        <para>Example:
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+        <programlisting>PassEnvironment=VAR1 VAR2 VAR3</programlisting>
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+        passes three variables <literal>VAR1</literal>,
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+        <literal>VAR2</literal>, <literal>VAR3</literal>
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+        with the values set for those variables in PID1.</para>
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+
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+        <para>
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+        See
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+        <citerefentry project='man-pages'><refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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+        for details about environment variables.</para></listitem>
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+      </varlistentry>
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+
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       <varlistentry>
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         <term><varname>StandardInput=</varname></term>
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         <listitem><para>Controls where file descriptor 0 (STDIN) of
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diff --git a/shell-completion/bash/systemd-run b/shell-completion/bash/systemd-run
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index 5145cd3f2..36ffa46db 100644
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--- a/shell-completion/bash/systemd-run
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+++ b/shell-completion/bash/systemd-run
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@@ -73,7 +73,7 @@ _systemd_run() {
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                          KillSignal= LimitCPU= LimitFSIZE= LimitDATA= LimitSTACK=
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                          LimitCORE= LimitRSS= LimitNOFILE= LimitAS= LimitNPROC=
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                          LimitMEMLOCK= LimitLOCKS= LimitSIGPENDING= LimitMSGQUEUE=
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-                         LimitNICE= LimitRTPRIO= LimitRTTIME='
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+                         LimitNICE= LimitRTPRIO= LimitRTTIME= PassEnvironment='
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             COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
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             return 0
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diff --git a/src/core/dbus-execute.c b/src/core/dbus-execute.c
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index a9f7971cd..da8b10d2b 100644
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--- a/src/core/dbus-execute.c
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+++ b/src/core/dbus-execute.c
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@@ -597,6 +597,7 @@ const sd_bus_vtable bus_exec_vtable[] = {
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         SD_BUS_VTABLE_START(0),
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         SD_BUS_PROPERTY("Environment", "as", NULL, offsetof(ExecContext, environment), SD_BUS_VTABLE_PROPERTY_CONST),
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         SD_BUS_PROPERTY("EnvironmentFiles", "a(sb)", property_get_environment_files, 0, SD_BUS_VTABLE_PROPERTY_CONST),
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+        SD_BUS_PROPERTY("PassEnvironment", "as", NULL, offsetof(ExecContext, pass_environment), SD_BUS_VTABLE_PROPERTY_CONST),
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         SD_BUS_PROPERTY("UMask", "u", bus_property_get_mode, offsetof(ExecContext, umask), SD_BUS_VTABLE_PROPERTY_CONST),
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         SD_BUS_PROPERTY("LimitCPU", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_CPU]), SD_BUS_VTABLE_PROPERTY_CONST),
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         SD_BUS_PROPERTY("LimitFSIZE", "t", property_get_rlimit, offsetof(ExecContext, rlimit[RLIMIT_FSIZE]), SD_BUS_VTABLE_PROPERTY_CONST),
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@@ -963,6 +964,39 @@ int bus_exec_context_set_transient_property(
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                 return 1;
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+        } else if (streq(name, "PassEnvironment")) {
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+
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+                _cleanup_strv_free_ char **l = NULL;
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+
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+                r = sd_bus_message_read_strv(message, &l);
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+                if (r < 0)
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+                        return r;
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+
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+                if (!strv_env_name_is_valid(l))
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+                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid PassEnvironment block.");
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+
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+                if (mode != UNIT_CHECK) {
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+                        if (strv_isempty(l)) {
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+                                strv_free(c->pass_environment);
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+                                c->pass_environment = NULL;
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+                                unit_write_drop_in_private_format(u, mode, name, "PassEnvironment=\n");
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+                        } else {
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+                                _cleanup_free_ char *joined = NULL;
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+
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+                                r = strv_extend_strv(&c->pass_environment, l);
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+                                if (r < 0)
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+                                        return r;
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+
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+                                joined = strv_join_quoted(c->pass_environment);
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+                                if (!joined)
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+                                        return -ENOMEM;
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+
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+                                unit_write_drop_in_private_format(u, mode, name, "PassEnvironment=%s\n", joined);
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+                        }
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+                }
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+
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+                return 1;
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+
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         } else if (rlimit_from_string(name) >= 0) {
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                 uint64_t rl;
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                 rlim_t x;
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diff --git a/src/core/execute.c b/src/core/execute.c
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index 863babd76..f72b20966 100644
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--- a/src/core/execute.c
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+++ b/src/core/execute.c
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@@ -1256,6 +1256,34 @@ static int build_environment(
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         return 0;
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 }
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+static int build_pass_environment(const ExecContext *c, char ***ret) {
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+        _cleanup_strv_free_ char **pass_env = NULL;
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+        size_t n_env = 0, n_bufsize = 0;
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+        char **i;
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+
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+        STRV_FOREACH(i, c->pass_environment) {
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+                _cleanup_free_ char *x = NULL;
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+                char *v;
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+
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+                v = getenv(*i);
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+                if (!v)
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+                        continue;
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+                x = strjoin(*i, "=", v, NULL);
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+                if (!x)
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+                        return -ENOMEM;
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+                if (!GREEDY_REALLOC(pass_env, n_bufsize, n_env + 2))
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+                        return -ENOMEM;
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+                pass_env[n_env++] = x;
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+                pass_env[n_env] = NULL;
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+                x = NULL;
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+        }
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+
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+        *ret = pass_env;
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+        pass_env = NULL;
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+
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+        return 0;
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+}
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+
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 static bool exec_needs_mount_namespace(
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                 const ExecContext *context,
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                 const ExecParameters *params,
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@@ -1297,7 +1325,7 @@ static int exec_child(
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                 char **files_env,
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                 int *exit_status) {
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-        _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL;
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+        _cleanup_strv_free_ char **our_env = NULL, **pass_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL;
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         _cleanup_free_ char *mac_selinux_context_net = NULL;
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         const char *username = NULL, *home = NULL, *shell = NULL;
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         unsigned n_dont_close = 0;
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@@ -1805,9 +1833,16 @@ static int exec_child(
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                 return r;
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         }
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-        final_env = strv_env_merge(5,
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+        r = build_pass_environment(context, &pass_env);
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+        if (r < 0) {
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+                *exit_status = EXIT_MEMORY;
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+                return r;
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+        }
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+
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+        final_env = strv_env_merge(6,
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                                    params->environment,
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                                    our_env,
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+                                   pass_env,
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                                    context->environment,
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                                    files_env,
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                                    pam_env,
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@@ -1965,6 +2000,8 @@ void exec_context_done(ExecContext *c) {
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         strv_free(c->environment_files);
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         c->environment_files = NULL;
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+        strv_free(c->pass_environment);
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+        c->pass_environment = NULL;
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         for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
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                 free(c->rlimit[l]);
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@@ -2267,6 +2304,9 @@ void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
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         STRV_FOREACH(e, c->environment_files)
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                 fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e);
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+        STRV_FOREACH(e, c->pass_environment)
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+                fprintf(f, "%sPassEnvironment: %s\n", prefix, *e);
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+
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         if (c->nice_set)
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                 fprintf(f,
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                         "%sNice: %i\n",
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diff --git a/src/core/execute.h b/src/core/execute.h
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index 6e0c9faa7..cadd0e6b4 100644
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--- a/src/core/execute.h
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+++ b/src/core/execute.h
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@@ -96,6 +96,7 @@ struct ExecRuntime {
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 struct ExecContext {
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         char **environment;
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         char **environment_files;
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+        char **pass_environment;
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         struct rlimit *rlimit[_RLIMIT_MAX];
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         char *working_directory, *root_directory;
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diff --git a/src/core/load-fragment-gperf.gperf.m4 b/src/core/load-fragment-gperf.gperf.m4
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index c866a9cd0..b50fe45b4 100644
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--- a/src/core/load-fragment-gperf.gperf.m4
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+++ b/src/core/load-fragment-gperf.gperf.m4
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@@ -33,6 +33,7 @@ $1.CPUAffinity,                  config_parse_exec_cpu_affinity,     0,
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 $1.UMask,                        config_parse_mode,                  0,                             offsetof($1, exec_context.umask)
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 $1.Environment,                  config_parse_environ,               0,                             offsetof($1, exec_context.environment)
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 $1.EnvironmentFile,              config_parse_unit_env_file,         0,                             offsetof($1, exec_context.environment_files)
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+$1.PassEnvironment,              config_parse_pass_environ,          0,                             offsetof($1, exec_context.pass_environment)
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 $1.StandardInput,                config_parse_input,                 0,                             offsetof($1, exec_context.std_input)
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 $1.StandardOutput,               config_parse_output,                0,                             offsetof($1, exec_context.std_output)
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 $1.StandardError,                config_parse_output,                0,                             offsetof($1, exec_context.std_error)
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diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
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index 3a3c456da..c450fe2c7 100644
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--- a/src/core/load-fragment.c
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+++ b/src/core/load-fragment.c
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@@ -2265,6 +2265,71 @@ int config_parse_environ(const char *unit,
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         return 0;
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 }
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+int config_parse_pass_environ(const char *unit,
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+                              const char *filename,
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+                              unsigned line,
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+                              const char *section,
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+                              unsigned section_line,
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+                              const char *lvalue,
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+                              int ltype,
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+                              const char *rvalue,
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+                              void *data,
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+                              void *userdata) {
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+
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+        const char *whole_rvalue = rvalue;
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+        char*** passenv = data;
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+        _cleanup_strv_free_ char **n = NULL;
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+        size_t nlen = 0, nbufsize = 0;
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+        int r;
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+
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+        assert(filename);
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+        assert(lvalue);
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+        assert(rvalue);
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+        assert(data);
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+
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+        if (isempty(rvalue)) {
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+                /* Empty assignment resets the list */
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+                strv_free(*passenv);
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+                *passenv = NULL;
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+                return 0;
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+        }
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+
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+        for (;;) {
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+                _cleanup_free_ char *word = NULL;
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+
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+                r = extract_first_word(&rvalue, &word, WHITESPACE, EXTRACT_QUOTES);
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+                if (r == 0)
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+                        break;
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+                if (r == -ENOMEM)
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+                        return log_oom();
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+                if (r < 0) {
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+                        log_syntax(unit, LOG_ERR, filename, line, r,
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+                                   "Trailing garbage in %s, ignoring: %s", lvalue, whole_rvalue);
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+                        break;
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+                }
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+
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+                if (!env_name_is_valid(word)) {
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+                        log_syntax(unit, LOG_ERR, filename, line, EINVAL,
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+                                   "Invalid environment name for %s, ignoring: %s", lvalue, word);
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+                        continue;
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+                }
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+
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+                if (!GREEDY_REALLOC(n, nbufsize, nlen + 2))
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+                        return log_oom();
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+                n[nlen++] = word;
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+                n[nlen] = NULL;
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+                word = NULL;
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+        }
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+
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+        if (n) {
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+                r = strv_extend_strv(passenv, n);
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+                if (r < 0)
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+                        return r;
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+        }
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+
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+        return 0;
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+}
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+
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 int config_parse_ip_tos(const char *unit,
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                         const char *filename,
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                         unsigned line,
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diff --git a/src/core/load-fragment.h b/src/core/load-fragment.h
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index 7c69e5369..9dd7d1bda 100644
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--- a/src/core/load-fragment.h
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+++ b/src/core/load-fragment.h
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@@ -85,6 +85,7 @@ int config_parse_syscall_filter(const char *unit, const char *filename, unsigned
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 int config_parse_syscall_archs(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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 int config_parse_syscall_errno(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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 int config_parse_environ(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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+int config_parse_pass_environ(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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 int config_parse_unit_slice(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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 int config_parse_cpu_shares(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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 int config_parse_memory_limit(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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diff --git a/src/libsystemd/sd-bus/bus-util.c b/src/libsystemd/sd-bus/bus-util.c
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index d35776087..ed0849b63 100644
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--- a/src/libsystemd/sd-bus/bus-util.c
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+++ b/src/libsystemd/sd-bus/bus-util.c
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@@ -1535,7 +1535,7 @@ int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignmen
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                 r = sd_bus_message_append(m, "v", "i", i);
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-        } else if (streq(field, "Environment")) {
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+        } else if (STR_IN_SET(field, "Environment", "PassEnvironment")) {
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                 r = sd_bus_message_append(m, "v", "as", 1, eq);
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diff --git a/src/shared/env-util.c b/src/shared/env-util.c
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index e8da4c978..581d84a20 100644
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--- a/src/shared/env-util.c
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+++ b/src/shared/env-util.c
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@@ -136,6 +136,21 @@ bool strv_env_is_valid(char **e) {
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         return true;
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 }
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+bool strv_env_name_is_valid(char **l) {
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+        char **p, **q;
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+
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+        STRV_FOREACH(p, l) {
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+                if (!env_name_is_valid(*p))
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+                        return false;
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+
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+                STRV_FOREACH(q, p + 1)
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+                        if (streq(*p, *q))
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+                                return false;
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+        }
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+
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+        return true;
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+}
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+
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 bool strv_env_name_or_assignment_is_valid(char **l) {
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         char **p, **q;
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diff --git a/src/shared/env-util.h b/src/shared/env-util.h
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index 252d87be1..b8c2d81e4 100644
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--- a/src/shared/env-util.h
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+++ b/src/shared/env-util.h
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@@ -34,6 +34,7 @@ bool strv_env_is_valid(char **e);
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 #define strv_env_clean(l) strv_env_clean_with_callback(l, NULL, NULL)
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 char **strv_env_clean_with_callback(char **l, void (*invalid_callback)(const char *p, void *userdata), void *userdata);
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+bool strv_env_name_is_valid(char **l);
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 bool strv_env_name_or_assignment_is_valid(char **l);
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 char **strv_env_merge(unsigned n_lists, ...);