core/execute: report invalid environment variables from files

Because "export key=val" is not supported by systemd, an error is logged
where the invalid assignment is coming from.

Introduce strv_env_clean_log() to log invalid environment assignments,
where logging is possible and allowed.

parse_env_file_internal() is modified to allow WHITESPACE in keys, to
report the issues later on.

3 files changed, 22 insertions, 21 deletions

diff --git a/src/shared/env-util.c b/src/shared/env-util.c
index 54988e6437..d3d4c59ab9 100644
--- a/src/shared/env-util.c
+++ b/src/shared/env-util.c
@@ -376,7 +376,7 @@ char *strv_env_get(char **l, const char *name) {
         return strv_env_get_n(l, name, strlen(name));
 }
 
-char **strv_env_clean(char **e) {
+char **strv_env_clean_log(char **e, const char *message) {
         char **p, **q;
         int k = 0;
 
@@ -385,6 +385,8 @@ char **strv_env_clean(char **e) {
                 bool duplicate = false;
 
                 if (!env_assignment_is_valid(*p)) {
+                        if (message)
+                                log_error("Ignoring invalid environment '%s': %s", *p, message);
                         free(*p);
                         continue;
                 }
@@ -407,3 +409,7 @@ char **strv_env_clean(char **e) {
         e[k] = NULL;
         return e;
 }
+
+char **strv_env_clean(char **e) {
+        return strv_env_clean_log(e, NULL);
+}
diff --git a/src/shared/env-util.h b/src/shared/env-util.h
index 9449576b5c..b2e520c102 100644
--- a/src/shared/env-util.h
+++ b/src/shared/env-util.h
@@ -30,6 +30,7 @@ bool env_assignment_is_valid(const char *e);
 
 bool strv_env_is_valid(char **e);
 char **strv_env_clean(char **l);
+char **strv_env_clean_log(char **e, const char *message);
 
 bool strv_env_name_or_assignment_is_valid(char **l);
 
diff --git a/src/shared/fileio.c b/src/shared/fileio.c
index 3f242edc60..4390726a93 100644
--- a/src/shared/fileio.c
+++ b/src/shared/fileio.c
@@ -184,7 +184,6 @@ static int parse_env_file_internal(
         enum {
                 PRE_KEY,
                 KEY,
-                PRE_EQUAL,
                 PRE_VALUE,
                 VALUE,
                 VALUE_ESCAPE,
@@ -209,9 +208,7 @@ static int parse_env_file_internal(
                 switch (state) {
 
                 case PRE_KEY:
-                        if (startswith(p, "export "))
-                                p+=6;
-                        else if (strchr(COMMENTS, c))
+                        if (strchr(COMMENTS, c))
                                 state = COMMENT;
                         else if (!strchr(WHITESPACE, c)) {
                                 state = KEY;
@@ -228,9 +225,7 @@ static int parse_env_file_internal(
                         if (strchr(newline, c)) {
                                 state = PRE_KEY;
                                 n_key = 0;
-                        } else if (strchr(WHITESPACE, c))
-                                state = PRE_EQUAL;
-                        else if (c == '=')
+                        } else if (c == '=')
                                 state = PRE_VALUE;
                         else {
                                 if (!greedy_realloc((void**) &key, &key_alloc, n_key+2)) {
@@ -243,19 +238,6 @@ static int parse_env_file_internal(
 
                         break;
 
-                case PRE_EQUAL:
-                        if (strchr(newline, c)) {
-                                state = PRE_KEY;
-                                n_key = 0;
-                        } else if (c == '=')
-                                state = PRE_VALUE;
-                        else if (!strchr(WHITESPACE, c)) {
-                                n_key = 0;
-                                state = COMMENT;
-                        }
-
-                        break;
-
                 case PRE_VALUE:
                         if (strchr(newline, c) || strchr(COMMENTS, c)) {
                                 state = PRE_KEY;
@@ -264,6 +246,10 @@ static int parse_env_file_internal(
                                 if (value)
                                         value[n_value] = 0;
 
+                                /* strip trailing whitespace from key */
+                                while(strchr(WHITESPACE, key[--n_key]))
+                                        key[n_key]=0;
+
                                 r = push(key, value, userdata);
                                 if (r < 0)
                                         goto fail;
@@ -302,6 +288,10 @@ static int parse_env_file_internal(
                                 if (last_whitespace != (size_t) -1)
                                         value[last_whitespace] = 0;
 
+                                /* strip trailing whitespace from key */
+                                while(strchr(WHITESPACE, key[--n_key]))
+                                        key[n_key]=0;
+
                                 r = push(key, value, userdata);
                                 if (r < 0)
                                         goto fail;
@@ -426,6 +416,10 @@ static int parse_env_file_internal(
                 if (value)
                         value[n_value] = 0;
 
+                /* strip trailing whitespace from key */
+                while(strchr(WHITESPACE, key[--n_key]))
+                        key[n_key]=0;
+
                 r = push(key, value, userdata);
                 if (r < 0)
                         goto fail;