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libsubid improvements 

- libsubid: don't print error messages on stderr by default
- libsubid: libsubid_init return false if out of memory
- useradd: fix SUB_UID_COUNT=0
- libsubid: don't return owner in list_owner_ranges API call
- libsubid: libsubid_init don't print messages on error
- libsubid: fix newusers when nss provides subids
- man: clarify subid delegation
- libsubid: make shadow_logfd not extern
This commit is contained in:
Iker Pedrosa 2021-06-21 13:24:36 +02:00
parent 1ec5088225
commit cbc60528c3
9 changed files with 3302 additions and 1 deletions
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151
shadow-4.8.1-libsubid_fix_newusers_nss_provides_subids.patch Normal file
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@ -0,0 +1,151 @@
diff -up shadow-4.8.1/lib/nss.c.libsubid_fix_newusers_nss_provides_subids shadow-4.8.1/lib/nss.c
--- shadow-4.8.1/lib/nss.c.libsubid_fix_newusers_nss_provides_subids 2021-05-25 09:37:14.772741048 +0200
+++ shadow-4.8.1/lib/nss.c 2021-05-25 09:37:14.782741188 +0200
@@ -116,14 +116,6 @@ void nss_init(char *nsswitch_path) {
subid_nss = NULL;
goto done;
}
- subid_nss->has_any_range = dlsym(h, "shadow_subid_has_any_range");
- if (!subid_nss->has_any_range) {
- fprintf(shadow_logfd, "%s did not provide @has_any_range@\n", libname);
- dlclose(h);
- free(subid_nss);
- subid_nss = NULL;
- goto done;
- }
subid_nss->find_subid_owners = dlsym(h, "shadow_subid_find_subid_owners");
if (!subid_nss->find_subid_owners) {
fprintf(shadow_logfd, "%s did not provide @find_subid_owners@\n", libname);
diff -up shadow-4.8.1/lib/prototypes.h.libsubid_fix_newusers_nss_provides_subids shadow-4.8.1/lib/prototypes.h
--- shadow-4.8.1/lib/prototypes.h.libsubid_fix_newusers_nss_provides_subids 2021-05-25 09:37:14.780741160 +0200
+++ shadow-4.8.1/lib/prototypes.h 2021-05-25 09:37:14.782741188 +0200
@@ -279,18 +279,6 @@ extern bool nss_is_initialized();
struct subid_nss_ops {
/*
- * nss_has_any_range: does a user own any subid range
- *
- * @owner: username
- * @idtype: subuid or subgid
- * @result: true if a subid allocation was found for @owner
- *
- * returns success if the module was able to determine an answer (true or false),
- * else an error status.
- */
- enum subid_status (*has_any_range)(const char *owner, enum subid_type idtype, bool *result);
-
- /*
* nss_has_range: does a user own a given subid range
*
* @owner: username
diff -up shadow-4.8.1/lib/subordinateio.c.libsubid_fix_newusers_nss_provides_subids shadow-4.8.1/lib/subordinateio.c
--- shadow-4.8.1/lib/subordinateio.c.libsubid_fix_newusers_nss_provides_subids 2021-05-25 09:37:14.780741160 +0200
+++ shadow-4.8.1/lib/subordinateio.c 2021-05-25 09:37:14.782741188 +0200
@@ -598,19 +598,8 @@ int sub_uid_open (int mode)
return commonio_open (&subordinate_uid_db, mode);
}
-bool sub_uid_assigned(const char *owner)
+bool local_sub_uid_assigned(const char *owner)
{
- struct subid_nss_ops *h;
- bool found;
- enum subid_status status;
- h = get_subid_nss_handle();
- if (h) {
- status = h->has_any_range(owner, ID_TYPE_UID, &found);
- if (status == SUBID_STATUS_SUCCESS && found)
- return true;
- return false;
- }
-
return range_exists (&subordinate_uid_db, owner);
}
@@ -720,18 +709,8 @@ bool have_sub_gids(const char *owner, gi
return have_range(&subordinate_gid_db, owner, start, count);
}
-bool sub_gid_assigned(const char *owner)
+bool local_sub_gid_assigned(const char *owner)
{
- struct subid_nss_ops *h;
- bool found;
- enum subid_status status;
- h = get_subid_nss_handle();
- if (h) {
- status = h->has_any_range(owner, ID_TYPE_GID, &found);
- if (status == SUBID_STATUS_SUCCESS && found)
- return true;
- return false;
- }
return range_exists (&subordinate_gid_db, owner);
}
diff -up shadow-4.8.1/lib/subordinateio.h.libsubid_fix_newusers_nss_provides_subids shadow-4.8.1/lib/subordinateio.h
--- shadow-4.8.1/lib/subordinateio.h.libsubid_fix_newusers_nss_provides_subids 2021-05-25 09:37:14.780741160 +0200
+++ shadow-4.8.1/lib/subordinateio.h 2021-05-25 09:37:14.782741188 +0200
@@ -16,7 +16,7 @@
extern int sub_uid_close(void);
extern bool have_sub_uids(const char *owner, uid_t start, unsigned long count);
extern bool sub_uid_file_present (void);
-extern bool sub_uid_assigned(const char *owner);
+extern bool local_sub_uid_assigned(const char *owner);
extern int sub_uid_lock (void);
extern int sub_uid_setdbname (const char *filename);
extern /*@observer@*/const char *sub_uid_dbname (void);
@@ -34,7 +34,7 @@ extern void free_subordinate_ranges(stru
extern int sub_gid_close(void);
extern bool have_sub_gids(const char *owner, gid_t start, unsigned long count);
extern bool sub_gid_file_present (void);
-extern bool sub_gid_assigned(const char *owner);
+extern bool local_sub_gid_assigned(const char *owner);
extern int sub_gid_lock (void);
extern int sub_gid_setdbname (const char *filename);
extern /*@observer@*/const char *sub_gid_dbname (void);
diff -up shadow-4.8.1/src/newusers.c.libsubid_fix_newusers_nss_provides_subids shadow-4.8.1/src/newusers.c
--- shadow-4.8.1/src/newusers.c.libsubid_fix_newusers_nss_provides_subids 2021-05-25 09:37:14.776741104 +0200
+++ shadow-4.8.1/src/newusers.c 2021-05-25 09:37:25.955897160 +0200
@@ -1021,6 +1021,24 @@ static void close_files (void)
#endif /* ENABLE_SUBIDS */
}
+static bool want_subuids(void)
+{
+ if (get_subid_nss_handle() != NULL)
+ return false;
+ if (getdef_ulong ("SUB_UID_COUNT", 65536) == 0)
+ return false;
+ return true;
+}
+
+static bool want_subgids(void)
+{
+ if (get_subid_nss_handle() != NULL)
+ return false;
+ if (getdef_ulong ("SUB_GID_COUNT", 65536) == 0)
+ return false;
+ return true;
+}
+
int main (int argc, char **argv)
{
char buf[BUFSIZ];
@@ -1250,7 +1268,7 @@ int main (int argc, char **argv)
/*
* Add subordinate uids if the user does not have them.
*/
- if (is_sub_uid && !sub_uid_assigned(fields[0])) {
+ if (is_sub_uid && want_subuids() && !local_sub_uid_assigned(fields[0])) {
uid_t sub_uid_start = 0;
unsigned long sub_uid_count = 0;
if (find_new_sub_uids(fields[0], &sub_uid_start, &sub_uid_count) == 0) {
@@ -1270,7 +1288,7 @@ int main (int argc, char **argv)
/*
* Add subordinate gids if the user does not have them.
*/
- if (is_sub_gid && !sub_gid_assigned(fields[0])) {
+ if (is_sub_gid && want_subgids() && !local_sub_gid_assigned(fields[0])) {
gid_t sub_gid_start = 0;
unsigned long sub_gid_count = 0;
if (find_new_sub_gids(fields[0], &sub_gid_start, &sub_gid_count) == 0) {

40
shadow-4.8.1-libsubid_init_not_print_error_messages.patch Normal file
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@ -0,0 +1,40 @@
From b0e86b959fe5c086ffb5e7eaf3c1b1e9219411e9 Mon Sep 17 00:00:00 2001
From: Serge Hallyn <serge@hallyn.com>
Date: Sun, 23 May 2021 08:03:10 -0500
Subject: [PATCH] libsubid_init: don't print messages on error
Signed-off-by: Serge Hallyn <serge@hallyn.com>
---
libsubid/api.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/libsubid/api.c b/libsubid/api.c
index c4848142..b477b271 100644
--- a/libsubid/api.c
+++ b/libsubid/api.c
@@ -46,12 +46,10 @@ bool libsubid_init(const char *progname, FILE * logfd)
{
if (progname) {
progname = strdup(progname);
- if (progname) {
+ if (progname)
Prog = progname;
- } else {
- fprintf(stderr, "Out of memory");
+ else
return false;
- }
}
if (logfd) {
@@ -60,7 +58,6 @@ bool libsubid_init(const char *progname, FILE * logfd)
}
shadow_logfd = fopen("/dev/null", "w");
if (!shadow_logfd) {
- fprintf(stderr, "ERROR opening /dev/null for error messages. Using stderr.");
shadow_logfd = stderr;
return false;
}
--
2.30.2

37
shadow-4.8.1-libsubid_init_return_false.patch Normal file
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@ -0,0 +1,37 @@
From e34f49c1966fcaa9390a544a0136ec189a3c870e Mon Sep 17 00:00:00 2001
From: Serge Hallyn <serge@hallyn.com>
Date: Mon, 17 May 2021 08:48:03 -0500
Subject: [PATCH] libsubid_init: return false if out of memory
The rest of the run isn't likely to get much better, is it?
Thanks to Alexey for pointing this out.
Signed-off-by: Serge Hallyn <serge@hallyn.com>
Cc: Alexey Tikhonov <atikhono@redhat.com>
---
libsubid/api.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/libsubid/api.c b/libsubid/api.c
index 8ca09859..8618e500 100644
--- a/libsubid/api.c
+++ b/libsubid/api.c
@@ -46,10 +46,12 @@ bool libsubid_init(const char *progname, FILE * logfd)
{
if (progname) {
progname = strdup(progname);
- if (progname)
+ if (progname) {
Prog = progname;
- else
+ } else {
fprintf(stderr, "Out of memory");
+ return false;
+ }
}
if (logfd) {
--
2.30.2

41
shadow-4.8.1-libsubid_make_logfd_not_extern.patch Normal file
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@ -0,0 +1,41 @@
From 1d767fb779d7b203ad609540d1dc605cf62d1050 Mon Sep 17 00:00:00 2001
From: Serge Hallyn <serge@hallyn.com>
Date: Fri, 28 May 2021 22:02:16 -0500
Subject: [PATCH] libsubid/api.c: make shadow_logfd not extern
Closes #346
Also #include stdio.h
Signed-off-by: Serge Hallyn <serge@hallyn.com>
---
libsubid/api.c | 2 +-
libsubid/subid.h | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/libsubid/api.c b/libsubid/api.c
index b477b271..a7b904d0 100644
--- a/libsubid/api.c
+++ b/libsubid/api.c
@@ -40,7 +40,7 @@
#include "subid.h"
const char *Prog = "(libsubid)";
-extern FILE * shadow_logfd;
+FILE *shadow_logfd;
bool libsubid_init(const char *progname, FILE * logfd)
{
diff --git a/libsubid/subid.h b/libsubid/subid.h
index 5fef2572..eabafe4d 100644
--- a/libsubid/subid.h
+++ b/libsubid/subid.h
@@ -1,4 +1,5 @@
#include <sys/types.h>
+#include <stdio.h>
#include <stdbool.h>
#ifndef SUBID_RANGE_DEFINED
--
2.31.1

2443
shadow-4.8.1-libsubid_not_print_error_messages.patch Normal file
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File diff suppressed because it is too large Load Diff

264
shadow-4.8.1-libsubid_simplify_ranges_variable.patch Normal file
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@ -0,0 +1,264 @@
diff -up shadow-4.8.1/configure.ac.libsubid_simplify_ranges_variable shadow-4.8.1/configure.ac
--- shadow-4.8.1/configure.ac.libsubid_simplify_ranges_variable 2021-05-24 15:02:56.165917066 +0200
+++ shadow-4.8.1/configure.ac 2021-05-24 15:02:56.184917324 +0200
@@ -1,6 +1,6 @@
dnl Process this file with autoconf to produce a configure script.
AC_PREREQ([2.69])
-m4_define([libsubid_abi_major], 2)
+m4_define([libsubid_abi_major], 3)
m4_define([libsubid_abi_minor], 0)
m4_define([libsubid_abi_micro], 0)
m4_define([libsubid_abi], [libsubid_abi_major.libsubid_abi_minor.libsubid_abi_micro])
diff -up shadow-4.8.1/lib/prototypes.h.libsubid_simplify_ranges_variable shadow-4.8.1/lib/prototypes.h
--- shadow-4.8.1/lib/prototypes.h.libsubid_simplify_ranges_variable 2021-05-24 15:02:56.184917324 +0200
+++ shadow-4.8.1/lib/prototypes.h 2021-05-24 16:38:57.610619467 +0200
@@ -309,16 +309,15 @@ struct subid_nss_ops {
*
* @owner - string representing username being queried
* @id_type - subuid or subgid
- * @ranges - pointer to an array of struct subordinate_range pointers, or
- * NULL. The returned array of struct subordinate_range and its
- * members must be freed by the caller.
+ * @ranges - pointer to an array of struct subid_range, or NULL. The
+ * returned array must be freed by the caller.
* @count - pointer to an integer into which the number of returned ranges
* is written.
* returns success if the module was able to determine an answer,
* else an error status.
*/
- enum subid_status (*list_owner_ranges)(const char *owner, enum subid_type id_type, struct subordinate_range ***ranges, int *count);
+ enum subid_status (*list_owner_ranges)(const char *owner, enum subid_type id_type, struct subid_range **ranges, int *count);
/*
* nss_find_subid_owners: find uids who own a given subuid or subgid.
diff -up shadow-4.8.1/libsubid/api.c.libsubid_simplify_ranges_variable shadow-4.8.1/libsubid/api.c
--- shadow-4.8.1/libsubid/api.c.libsubid_simplify_ranges_variable 2021-05-24 15:03:01.467989079 +0200
+++ shadow-4.8.1/libsubid/api.c 2021-05-24 16:42:32.091584531 +0200
@@ -68,26 +68,21 @@ bool libsubid_init(const char *progname,
}
static
-int get_subid_ranges(const char *owner, enum subid_type id_type, struct subordinate_range ***ranges)
+int get_subid_ranges(const char *owner, enum subid_type id_type, struct subid_range **ranges)
{
return list_owner_ranges(owner, id_type, ranges);
}
-int get_subuid_ranges(const char *owner, struct subordinate_range ***ranges)
+int get_subuid_ranges(const char *owner, struct subid_range **ranges)
{
return get_subid_ranges(owner, ID_TYPE_UID, ranges);
}
-int get_subgid_ranges(const char *owner, struct subordinate_range ***ranges)
+int get_subgid_ranges(const char *owner, struct subid_range **ranges)
{
return get_subid_ranges(owner, ID_TYPE_GID, ranges);
}
-void subid_free_ranges(struct subordinate_range **ranges, int count)
-{
- return free_subordinate_ranges(ranges, count);
-}
-
static
int get_subid_owner(unsigned long id, enum subid_type id_type, uid_t **owner)
{
diff -up shadow-4.8.1/libsubid/subid.h.libsubid_simplify_ranges_variable shadow-4.8.1/libsubid/subid.h
--- shadow-4.8.1/libsubid/subid.h.libsubid_simplify_ranges_variable 2021-05-24 15:03:01.468989093 +0200
+++ shadow-4.8.1/libsubid/subid.h 2021-05-24 16:43:49.697657383 +0200
@@ -3,6 +3,15 @@
#ifndef SUBID_RANGE_DEFINED
#define SUBID_RANGE_DEFINED 1
+
+/* subid_range is just a starting point and size of a range */
+struct subid_range {
+ unsigned long start;
+ unsigned long count;
+};
+
+/* subordinage_range is a subid_range plus an owner, representing
+ * a range in /etc/subuid or /etc/subgid */
struct subordinate_range {
const char *owner;
unsigned long start;
@@ -41,32 +50,27 @@ bool libsubid_init(const char *progname,
* get_subuid_ranges: return a list of UID ranges for a user
*
* @owner: username being queried
- * @ranges: a pointer to a subordinate range ** in which the result will be
- * returned.
+ * @ranges: a pointer to an array of subid_range structs in which the result
+ * will be returned.
+ *
+ * The caller must free(ranges) when done.
*
* returns: number of ranges found, ir < 0 on error.
*/
-int get_subuid_ranges(const char *owner, struct subordinate_range ***ranges);
+int get_subuid_ranges(const char *owner, struct subid_range **ranges);
/*
* get_subgid_ranges: return a list of GID ranges for a user
*
* @owner: username being queried
- * @ranges: a pointer to a subordinate range ** in which the result will be
- * returned.
+ * @ranges: a pointer to an array of subid_range structs in which the result
+ * will be returned.
*
- * returns: number of ranges found, ir < 0 on error.
- */
-int get_subgid_ranges(const char *owner, struct subordinate_range ***ranges);
-
-/*
- * subid_free_ranges: free an array of subordinate_ranges returned by either
- * get_subuid_ranges() or get_subgid_ranges().
+ * The caller must free(ranges) when done.
*
- * @ranges: the ranges to free
- * @count: the number of ranges in @ranges
+ * returns: number of ranges found, ir < 0 on error.
*/
-void subid_free_ranges(struct subordinate_range **ranges, int count);
+int get_subgid_ranges(const char *owner, struct subid_range **ranges);
/*
* get_subuid_owners: return a list of uids to which the given uid has been
diff -up shadow-4.8.1/lib/subordinateio.c.libsubid-simplify shadow-4.8.1/lib/subordinateio.c
--- shadow-4.8.1/lib/subordinateio.c.libsubid-simplify 2021-05-24 17:27:38.721035241 +0200
+++ shadow-4.8.1/lib/subordinateio.c 2021-05-24 17:28:06.481420946 +0200
@@ -11,6 +11,7 @@
#include <stdio.h>
#include "commonio.h"
#include "subordinateio.h"
+#include "../libsubid/subid.h"
#include <sys/types.h>
#include <pwd.h>
#include <ctype.h>
@@ -308,25 +309,21 @@ static bool have_range(struct commonio_d
return false;
}
-static bool append_range(struct subordinate_range ***ranges, const struct subordinate_range *new, int n)
+static bool append_range(struct subid_range **ranges, const struct subordinate_range *new, int n)
{
- struct subordinate_range *tmp;
if (!*ranges) {
- *ranges = malloc(sizeof(struct subordinate_range *));
+ *ranges = malloc(sizeof(struct subid_range));
if (!*ranges)
return false;
} else {
- struct subordinate_range **new;
- new = realloc(*ranges, (n + 1) * (sizeof(struct subordinate_range *)));
- if (!new)
+ struct subid_range *alloced;
+ alloced = realloc(*ranges, (n + 1) * (sizeof(struct subid_range)));
+ if (!alloced)
return false;
- *ranges = new;
+ *ranges = alloced;
}
- (*ranges)[n] = NULL;
- tmp = subordinate_dup(new);
- if (!tmp)
- return false;
- (*ranges)[n] = tmp;
+ (*ranges)[n].start = new->start;
+ (*ranges)[n].count = new->count;
return true;
}
@@ -785,10 +782,10 @@ gid_t sub_gid_find_free_range(gid_t min,
*
* The caller must free the subordinate range list.
*/
-int list_owner_ranges(const char *owner, enum subid_type id_type, struct subordinate_range ***in_ranges)
+int list_owner_ranges(const char *owner, enum subid_type id_type, struct subid_range **in_ranges)
{
// TODO - need to handle owner being either uid or username
- struct subordinate_range **ranges = NULL;
+ struct subid_range *ranges = NULL;
const struct subordinate_range *range;
struct commonio_db *db;
enum subid_status status;
@@ -826,7 +823,7 @@ int list_owner_ranges(const char *owner,
while ((range = commonio_next(db)) != NULL) {
if (0 == strcmp(range->owner, owner)) {
if (!append_range(&ranges, range, count++)) {
- free_subordinate_ranges(ranges, count-1);
+ free(ranges);
ranges = NULL;
count = -1;
goto out;
diff -up shadow-4.8.1/lib/subordinateio.h.libsubid_simplify_ranges_variable shadow-4.8.1/lib/subordinateio.h
--- shadow-4.8.1/lib/subordinateio.h.libsubid_simplify_ranges_variable 2021-05-24 15:03:01.467989079 +0200
+++ shadow-4.8.1/lib/subordinateio.h 2021-05-24 16:40:56.978269647 +0200
@@ -25,7 +25,7 @@ extern int sub_uid_unlock (void);
extern int sub_uid_add (const char *owner, uid_t start, unsigned long count);
extern int sub_uid_remove (const char *owner, uid_t start, unsigned long count);
extern uid_t sub_uid_find_free_range(uid_t min, uid_t max, unsigned long count);
-extern int list_owner_ranges(const char *owner, enum subid_type id_type, struct subordinate_range ***ranges);
+extern int list_owner_ranges(const char *owner, enum subid_type id_type, struct subid_range **ranges);
extern bool new_subid_range(struct subordinate_range *range, enum subid_type id_type, bool reuse);
extern bool release_subid_range(struct subordinate_range *range, enum subid_type id_type);
extern int find_subid_owners(unsigned long id, enum subid_type id_type, uid_t **uids);
diff -up shadow-4.8.1/src/list_subid_ranges.c.libsubid_simplify_ranges_variable shadow-4.8.1/src/list_subid_ranges.c
--- shadow-4.8.1/src/list_subid_ranges.c.libsubid_simplify_ranges_variable 2021-05-24 15:03:01.468989093 +0200
+++ shadow-4.8.1/src/list_subid_ranges.c 2021-05-24 16:45:10.884779740 +0200
@@ -17,27 +17,29 @@ void usage(void)
int main(int argc, char *argv[])
{
int i, count=0;
- struct subordinate_range **ranges;
+ struct subid_range *ranges;
+ const char *owner;
Prog = Basename (argv[0]);
shadow_logfd = stderr;
- if (argc < 2) {
+ if (argc < 2)
usage();
- }
- if (argc == 3 && strcmp(argv[1], "-g") == 0)
- count = get_subgid_ranges(argv[2], &ranges);
- else if (argc == 2 && strcmp(argv[1], "-h") == 0)
+ owner = argv[1];
+ if (argc == 3 && strcmp(argv[1], "-g") == 0) {
+ owner = argv[2];
+ count = get_subgid_ranges(owner, &ranges);
+ } else if (argc == 2 && strcmp(argv[1], "-h") == 0) {
usage();
- else
- count = get_subuid_ranges(argv[1], &ranges);
+ } else {
+ count = get_subuid_ranges(owner, &ranges);
+ }
if (!ranges) {
fprintf(stderr, "Error fetching ranges\n");
exit(1);
}
for (i = 0; i < count; i++) {
- printf("%d: %s %lu %lu\n", i, ranges[i]->owner,
- ranges[i]->start, ranges[i]->count);
+ printf("%d: %s %lu %lu\n", i, owner,
+ ranges[i].start, ranges[i].count);
}
- subid_free_ranges(ranges, count);
return 0;
}
diff -up shadow-4.8.1/tests/libsubid/04_nss/libsubid_zzz.c.libsubid_simplify_ranges_variable shadow-4.8.1/tests/libsubid/04_nss/libsubid_zzz.c
--- shadow-4.8.1/tests/libsubid/04_nss/libsubid_zzz.c.libsubid_simplify_ranges_variable 2021-05-24 15:02:56.166917079 +0200
+++ shadow-4.8.1/tests/libsubid/04_nss/libsubid_zzz.c 2021-05-24 15:03:01.469989106 +0200
@@ -113,7 +113,7 @@ enum subid_status shadow_subid_list_owne
if (strcmp(owner, "conn") == 0)
return SUBID_STATUS_ERROR_CONN;
- *ranges = NULL;
+ *in_ranges = NULL;
if (strcmp(owner, "user1") != 0 && strcmp(owner, "ubuntu") != 0 &&
strcmp(owner, "group1") != 0)
return SUBID_STATUS_SUCCESS;

246
shadow-4.8.1-man_clarify_subid_delegation.patch Normal file
View File

@ -0,0 +1,246 @@
From d5b15f8633d0eabed885cd16feda224ec2d59072 Mon Sep 17 00:00:00 2001
From: Iker Pedrosa <ipedrosa@redhat.com>
Date: Mon, 24 May 2021 12:14:43 +0200
Subject: [PATCH] man: clarify subid delegation
Clarify that the subid delegation can only come from one source.
Moreover, add an example of what might happen if the subid source is NSS
and useradd is executed.
Related: https://github.com/shadow-maint/shadow/issues/331
---
man/newgidmap.1.xml | 12 +++++++++---
man/newuidmap.1.xml | 10 ++++++++--
2 files changed, 17 insertions(+), 5 deletions(-)
diff --git a/man/newgidmap.1.xml b/man/newgidmap.1.xml
index 76fc1e30..7aaf34bf 100644
--- a/man/newgidmap.1.xml
+++ b/man/newgidmap.1.xml
@@ -88,9 +88,15 @@
<title>DESCRIPTION</title>
<para>
The <command>newgidmap</command> sets <filename>/proc/[pid]/gid_map</filename> based on its
- command line arguments and the gids allowed (either in <filename>/etc/subgid</filename> or
- through the configured NSS subid module).
- Note that the root user is not exempted from the requirement for a valid
+ command line arguments and the gids allowed. The subid delegation can come either from files
+ (<filename>/etc/subgid</filename>) or from the configured NSS subid module. Only one of them
+ can be chosen at a time. So, for example, if the subid source is configured as NSS and
+ <command>groupadd</command> is executed, then the command will fail and the entry will not be
+ created in <filename>/etc/subgid</filename>.
+ </para>
+
+ <para>
+ Note that the root group is not exempted from the requirement for a valid
<filename>/etc/subgid</filename> entry.
</para>
diff --git a/man/newuidmap.1.xml b/man/newuidmap.1.xml
index 44eca50a..4bc1ef7a 100644
--- a/man/newuidmap.1.xml
+++ b/man/newuidmap.1.xml
@@ -88,8 +88,14 @@
<title>DESCRIPTION</title>
<para>
The <command>newuidmap</command> sets <filename>/proc/[pid]/uid_map</filename> based on its
- command line arguments and the uids allowed (either in <filename>/etc/subuid</filename> or
- through the configured NSS subid module).
+ command line arguments and the uids allowed. The subid delegation can come either from files
+ (<filename>/etc/subuid</filename>) or from the configured NSS subid module. Only one of them
+ can be chosen at a time. So, for example, if the subid source is configured as NSS and
+ <command>useradd</command> is executed, then the command will fail and the entry will not be
+ created in <filename>/etc/subuid</filename>.
+ </para>
+
+ <para>
Note that the root user is not exempted from the requirement for a valid
<filename>/etc/subuid</filename> entry.
</para>
--
2.30.2
From 68ebbf936038e4e4c8b5105bd3246ef9709b6354 Mon Sep 17 00:00:00 2001
From: Iker Pedrosa <ipedrosa@redhat.com>
Date: Mon, 7 Jun 2021 11:50:56 +0200
Subject: [PATCH 1/2] man: clarify subid delegation behaviour
Following the discussion https://github.com/shadow-maint/shadow/pull/345
I have changed the documentation to clarify the behaviour of subid
delegation when any subid source except files is configured.
---
man/newgidmap.1.xml | 11 +++++------
man/newuidmap.1.xml | 11 +++++------
2 files changed, 10 insertions(+), 12 deletions(-)
diff --git a/man/newgidmap.1.xml b/man/newgidmap.1.xml
index 7aaf34bf..681aefcb 100644
--- a/man/newgidmap.1.xml
+++ b/man/newgidmap.1.xml
@@ -87,12 +87,11 @@
<refsect1 id='description'>
<title>DESCRIPTION</title>
<para>
- The <command>newgidmap</command> sets <filename>/proc/[pid]/gid_map</filename> based on its
- command line arguments and the gids allowed. The subid delegation can come either from files
- (<filename>/etc/subgid</filename>) or from the configured NSS subid module. Only one of them
- can be chosen at a time. So, for example, if the subid source is configured as NSS and
- <command>groupadd</command> is executed, then the command will fail and the entry will not be
- created in <filename>/etc/subgid</filename>.
+ The <command>newgidmap</command> sets <filename>/proc/[pid]/gid_map</filename>
+ based on its command line arguments and the gids allowed. Subgid
+ delegation can either be managed via <filename>/etc/subgid</filename>
+ or through the configured NSS subid module. These options are mutually
+ exclusive.
</para>
<para>
diff --git a/man/newuidmap.1.xml b/man/newuidmap.1.xml
index 4bc1ef7a..09e65d80 100644
--- a/man/newuidmap.1.xml
+++ b/man/newuidmap.1.xml
@@ -87,12 +87,11 @@
<refsect1 id='description'>
<title>DESCRIPTION</title>
<para>
- The <command>newuidmap</command> sets <filename>/proc/[pid]/uid_map</filename> based on its
- command line arguments and the uids allowed. The subid delegation can come either from files
- (<filename>/etc/subuid</filename>) or from the configured NSS subid module. Only one of them
- can be chosen at a time. So, for example, if the subid source is configured as NSS and
- <command>useradd</command> is executed, then the command will fail and the entry will not be
- created in <filename>/etc/subuid</filename>.
+ The <command>newuidmap</command> sets <filename>/proc/[pid]/uid_map</filename>
+ based on its command line arguments and the uids allowed. Subuid
+ delegation can either be managed via <filename>/etc/subuid</filename> or
+ through the configured NSS subid module. These options are mutually
+ exclusive.
</para>
<para>
--
2.31.1
From 0faec51bf0ec24e6e3d098cc55ed42584dd24efe Mon Sep 17 00:00:00 2001
From: Iker Pedrosa <ipedrosa@redhat.com>
Date: Fri, 11 Jun 2021 15:25:42 +0200
Subject: [PATCH 2/2] man: definition and configuration of subid
Define the subid functionality and explain the way to configure its
delegation.
---
man/subgid.5.xml | 32 +++++++++++++++++++++++++++++++-
man/subuid.5.xml | 32 +++++++++++++++++++++++++++++++-
2 files changed, 62 insertions(+), 2 deletions(-)
diff --git a/man/subgid.5.xml b/man/subgid.5.xml
index 70c561c4..02f421ab 100644
--- a/man/subgid.5.xml
+++ b/man/subgid.5.xml
@@ -38,6 +38,11 @@
<surname>Biederman</surname>
<contrib>Creation, 2013</contrib>
</author>
+ <author>
+ <firstname>Iker</firstname>
+ <surname>Pedrosa</surname>
+ <contrib>Developer, 2021</contrib>
+ </author>
</refentryinfo>
<refmeta>
<refentrytitle>subgid</refentrytitle>
@@ -48,11 +53,36 @@
</refmeta>
<refnamediv id='name'>
<refname>subgid</refname>
- <refpurpose>the subordinate gid file</refpurpose>
+ <refpurpose>the configuration for subordinate group ids</refpurpose>
</refnamediv>
<refsect1 id='description'>
<title>DESCRIPTION</title>
+ <para>
+ Subgid authorizes a group id to map ranges of group ids from its namespace
+ into child namespaces.
+ </para>
+ <para>
+ The delegation of the subordinate gids can be configured via the
+ <replaceable>subid</replaceable> field in
+ <filename>/etc/nsswitch.conf</filename> file. Only one value can be set
+ as the delegation source. Setting this field to
+ <replaceable>files</replaceable> configures the delegation of gids to
+ <filename>/etc/subgid</filename>. Setting any other value treats
+ the delegation as a plugin following with a name of the form
+ <replaceable>libsubid_$value.so</replaceable>. If the value or plugin is
+ missing, then the subordinate gid delegation falls back to
+ <replaceable>files</replaceable>.
+ </para>
+ <para>
+ Note, that <command>groupadd</command> will only create entries in
+ <filename>/etc/subgid</filename> if subid delegation is managed via subid
+ files.
+ </para>
+ </refsect1>
+
+ <refsect1 id='local-subordinate-delegation'>
+ <title>LOCAL SUBORDINATE DELEGATION</title>
<para>
Each line in <filename>/etc/subgid</filename> contains
a user name and a range of subordinate group ids that user
diff --git a/man/subuid.5.xml b/man/subuid.5.xml
index ec6a85f5..990d162e 100644
--- a/man/subuid.5.xml
+++ b/man/subuid.5.xml
@@ -38,6 +38,11 @@
<surname>Biederman</surname>
<contrib>Creation, 2013</contrib>
</author>
+ <author>
+ <firstname>Iker</firstname>
+ <surname>Pedrosa</surname>
+ <contrib>Developer, 2021</contrib>
+ </author>
</refentryinfo>
<refmeta>
<refentrytitle>subuid</refentrytitle>
@@ -48,11 +53,36 @@
</refmeta>
<refnamediv id='name'>
<refname>subuid</refname>
- <refpurpose>the subordinate uid file</refpurpose>
+ <refpurpose>the configuration for subordinate user ids</refpurpose>
</refnamediv>
<refsect1 id='description'>
<title>DESCRIPTION</title>
+ <para>
+ Subuid authorizes a user id to map ranges of user ids from its namespace
+ into child namespaces.
+ </para>
+ <para>
+ The delegation of the subordinate uids can be configured via the
+ <replaceable>subid</replaceable> field in
+ <filename>/etc/nsswitch.conf</filename> file. Only one value can be set
+ as the delegation source. Setting this field to
+ <replaceable>files</replaceable> configures the delegation of uids to
+ <filename>/etc/subuid</filename>. Setting any other value treats
+ the delegation as a plugin following with a name of the form
+ <replaceable>libsubid_$value.so</replaceable>. If the value or plugin is
+ missing, then the subordinate uid delegation falls back to
+ <replaceable>files</replaceable>.
+ </para>
+ <para>
+ Note, that <command>useradd</command> will only create entries in
+ <filename>/etc/subuid</filename> if subid delegation is managed via subid
+ files.
+ </para>
+ </refsect1>
+
+ <refsect1 id='local-subordinate-delegation'>
+ <title>LOCAL SUBORDINATE DELEGATION</title>
<para>
Each line in <filename>/etc/subuid</filename> contains
a user name and a range of subordinate user ids that user
--
2.31.1

44
shadow-4.8.1-useradd_SUB_UID_COUNT-0.patch Normal file
View File

@ -0,0 +1,44 @@
From 663824ef4ca927aa2b4319b69e0bfa68282ec719 Mon Sep 17 00:00:00 2001
From: Serge Hallyn <serge@hallyn.com>
Date: Sat, 22 May 2021 11:42:02 -0500
Subject: [PATCH] Fix useradd with SUB_UID_COUNT=0
Closes #298
Fix useradd when SUB_UID_COUNT=0 in login.defs.
Signed-off-by: Serge Hallyn <serge@hallyn.com>
---
src/useradd.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/src/useradd.c b/src/useradd.c
index 06accb2f..9862ae55 100644
--- a/src/useradd.c
+++ b/src/useradd.c
@@ -2386,6 +2386,8 @@ int main (int argc, char **argv)
#ifdef ENABLE_SUBIDS
uid_t uid_min;
uid_t uid_max;
+ unsigned long subuid_count;
+ unsigned long subgid_count;
#endif
/*
@@ -2427,9 +2429,11 @@ int main (int argc, char **argv)
#ifdef ENABLE_SUBIDS
uid_min = (uid_t) getdef_ulong ("UID_MIN", 1000UL);
uid_max = (uid_t) getdef_ulong ("UID_MAX", 60000UL);
- is_sub_uid = sub_uid_file_present () && !rflg &&
+ subuid_count = getdef_ulong ("SUB_UID_COUNT", 65536);
+ subgid_count = getdef_ulong ("SUB_GID_COUNT", 65536);
+ is_sub_uid = subuid_count > 0 && sub_uid_file_present () && !rflg &&
(!user_id || (user_id <= uid_max && user_id >= uid_min));
- is_sub_gid = sub_gid_file_present () && !rflg &&
+ is_sub_gid = subgid_count > 0 && sub_gid_file_present () && !rflg &&
(!user_id || (user_id <= uid_max && user_id >= uid_min));
#endif /* ENABLE_SUBIDS */
--
2.30.2

37
shadow-utils.spec
View File

@ -1,7 +1,7 @@
Summary: Utilities for managing accounts and shadow password files
Name: shadow-utils
Version: 4.8.1
Release: 10%{?dist}
Release: 11%{?dist}
Epoch: 2
URL: https://github.com/shadow-maint/shadow
Source0: https://github.com/shadow-maint/shadow/releases/download/%{version}/shadow-%{version}.tar.xz
@ -78,6 +78,23 @@ Patch47: shadow-4.8.1-libsubid_creation.patch
Patch48: shadow-4.8.1-libsubid_nsswitch_support.patch
# https://github.com/shadow-maint/shadow/commit/186b1b7ac1a68d0fcc618a22da1a99232b420911
Patch49: shadow-4.8.1-man-mention-nss-in-newuidmap.patch
# https://github.com/shadow-maint/shadow/commit/f9831a4a1a20b0e8fe47cc72ec20018ec04dbb90
Patch50: shadow-4.8.1-libsubid_not_print_error_messages.patch
# https://github.com/shadow-maint/shadow/commit/c6cab4a7bafa18d9d65a333cac1261e7b5e32bc9
Patch51: shadow-4.8.1-libsubid_init_return_false.patch
# https://github.com/shadow-maint/shadow/commit/2f1f45d64fc7c10e7a3cbe00e89f63714343e526
Patch52: shadow-4.8.1-useradd_SUB_UID_COUNT-0.patch
# https://github.com/shadow-maint/shadow/commit/ea7af4e1543c63590d4107ae075fea385028997d
Patch53: shadow-4.8.1-libsubid_simplify_ranges_variable.patch
# https://github.com/shadow-maint/shadow/commit/0fe42f571c69f0105d31305f995c9887aeb9525e
Patch54: shadow-4.8.1-libsubid_init_not_print_error_messages.patch
# https://github.com/shadow-maint/shadow/commit/ec1951c181faed188464396b2cfdd2efb726c7f3
Patch55: shadow-4.8.1-libsubid_fix_newusers_nss_provides_subids.patch
# https://github.com/shadow-maint/shadow/commit/087112244327be50abc24f9ec8afbf60ae8b2dec
# https://github.com/shadow-maint/shadow/pull/353
Patch56: shadow-4.8.1-man_clarify_subid_delegation.patch
# https://github.com/shadow-maint/shadow/commit/bd920ab36a6c641e4a8769f8c7f8ca738ec61820
Patch57: shadow-4.8.1-libsubid_make_logfd_not_extern.patch
License: BSD and GPLv2+
BuildRequires: make
@ -152,6 +169,14 @@ Development files for shadow-utils-subid.
%patch47 -p1 -b .libsubid_creation
%patch48 -p1 -b .libsubid_nsswitch_support
%patch49 -p1 -b .man-mention-nss-in-newuidmap
%patch50 -p1 -b .libsubid_not_print_error_messages
%patch51 -p1 -b .libsubid_init_return_false
%patch52 -p1 -b .useradd_SUB_UID_COUNT-0
%patch53 -p1 -b .libsubid_simplify_ranges_variable
%patch54 -p1 -b .libsubid_init_not_print_error_messages
%patch55 -p1 -b .libsubid_fix_newusers_nss_provides_subids
%patch56 -p1 -b .man_clarify_subid_delegation
%patch57 -p1 -b .libsubid_make_logfd_not_extern
iconv -f ISO88591 -t utf-8 doc/HOWTO > doc/HOWTO.utf8
cp -f doc/HOWTO.utf8 doc/HOWTO
@ -320,6 +345,16 @@ rm -f $RPM_BUILD_ROOT/%{_libdir}/libsubid.la
%{_libdir}/libsubid.so
%changelog
* Mon Jun 21 2021 Iker Pedrosa <ipedrosa@redhat.com> - 2:4.8.1-11
- libsubid: don't print error messages on stderr by default
- libsubid: libsubid_init return false if out of memory
- useradd: fix SUB_UID_COUNT=0
- libsubid: don't return owner in list_owner_ranges API call
- libsubid: libsubid_init don't print messages on error
- libsubid: fix newusers when nss provides subids
- man: clarify subid delegation
- libsubid: make shadow_logfd not extern
* Thu May 6 2021 Iker Pedrosa <ipedrosa@redhat.com> - 2:4.8.1-10
- man: mention NSS in new[ug]idmap manpages
- libsubid: move development header to shadow folder