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swtpm: allow passing of uid numbers for user Ids.

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Try to parse a userid as an integer first and only if that fails,
interpret it as a name.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
This commit is contained in:
Stefan Berger 2018-04-05 13:40:46 -04:00
parent f4286d0a0e
commit cebb1a9c1f
1 changed files with 36 additions and 16 deletions
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52
src/swtpm/utils.c
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@ -83,30 +83,50 @@ err_exit:
int
change_process_owner(const char *user)
{
struct passwd *passwd = getpwnam(user);
struct passwd *passwd;
long int uid, gid;
char *endptr = NULL;
if (!passwd) {
logprintf(STDERR_FILENO,
"Error: User '%s' does not exist.\n",
user);
return 14;
uid = strtoul(user, &endptr, 10);
if (*endptr != '\0') {
/* a string */
passwd = getpwnam(user);
if (!passwd) {
logprintf(STDERR_FILENO,
"Error: User '%s' does not exist.\n",
user);
return 14;
}
if (initgroups(passwd->pw_name, passwd->pw_gid) < 0) {
logprintf(STDERR_FILENO,
"Error: initgroups(%s, %d) failed.\n",
passwd->pw_name, passwd->pw_gid);
return -10;
}
gid = passwd->pw_gid;
uid = passwd->pw_uid;
} else {
/* an integer */
if ((unsigned long int)uid > UINT_MAX) {
logprintf(STDERR_FILENO,
"Error: uid %s outside valid range.\n",
user);
return -13;
}
gid = uid;
}
if (initgroups(passwd->pw_name, passwd->pw_gid) < 0) {
logprintf(STDERR_FILENO,
"Error: initgroups(%s, %d) failed.\n",
passwd->pw_name, passwd->pw_gid);
return -10;
}
if (setgid(passwd->pw_gid) < 0) {
if (setgid(gid) < 0) {
logprintf(STDERR_FILENO,
"Error: setgid(%d) failed.\n",
passwd->pw_gid);
gid);
return -11;
}
if (setuid(passwd->pw_uid) < 0) {
if (setuid(uid) < 0) {
logprintf(STDERR_FILENO,
"Error: setuid(%d) failed.\n",
passwd->pw_uid);
uid);
return -12;
}
return 0;