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Refactor input validation

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Mutualize code to validate inputs of both 'user' and 'group' command
Test that the input name fits into MAXLOGNAME
This commit is contained in:
Baptiste Daroussin 2015-06-07 19:03:41 +00:00
parent 8b84d791a0
commit a923718979
5 changed files with 117 additions and 103 deletions
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49
usr.sbin/pw/pw.c
View File

@ -99,9 +99,11 @@ main(int argc, char *argv[])
int ch;
int mode = -1;
int which = -1;
long id = -1;
char *config = NULL;
struct stat st;
char arg;
const char *errstr;
char arg, *name;
bool relocated, nis;
static const char *opts[W_NUM][M_NUM] =
@ -124,12 +126,14 @@ main(int argc, char *argv[])
}
};
static int (*funcs[W_NUM]) (int _mode, struct cargs * _args) =
static int (*funcs[W_NUM]) (int _mode, char *_name, long _id,
struct cargs * _args) =
{ /* Request handlers */
pw_user,
pw_group
};
name = NULL;
relocated = nis = false;
memset(&conf, 0, sizeof(conf));
strlcpy(conf.etcpath, _PATH_PWD, sizeof(conf.etcpath));
@ -190,9 +194,15 @@ main(int argc, char *argv[])
mode = tmp % M_NUM;
} else if (strcmp(argv[1], "help") == 0 && argv[2] == NULL)
cmdhelp(mode, which);
else if (which != -1 && mode != -1)
addarg(&arglist, 'n', argv[1]);
else
else if (which != -1 && mode != -1) {
if (strspn(argv[1], "0123456789") == strlen(argv[1])) {
id = strtonum(argv[1], 0, LONG_MAX, &errstr);
if (errstr != NULL)
errx(EX_USAGE, "Bad id '%s': %s",
argv[1], errstr);
} else
name = argv[1];
} else
errx(EX_USAGE, "unknown keyword `%s'", argv[1]);
++argv;
--argc;
@ -230,6 +240,30 @@ main(int argc, char *argv[])
case 'Y':
nis = true;
break;
case 'g':
if (which == 0) { /* for user* */
addarg(&arglist, 'g', optarg);
break;
}
/* FALLTHROUGH */
case 'u':
if (strspn(optarg, "0123456789") != strlen(optarg))
errx(EX_USAGE, "%s expects a number",
which == 1 ? "-g" : "-u" );
id = strtonum(optarg, 0, LONG_MAX, &errstr);
if (errstr != NULL)
errx(EX_USAGE, "Bad id '%s': %s", optarg,
errstr);
break;
case 'n':
if (strspn(optarg, "0123456789") != strlen(optarg)) {
name = optarg;
break;
}
id = strtonum(optarg, 0, LONG_MAX, &errstr);
if (errstr != NULL)
errx(EX_USAGE, "Bad id '%s': %s", optarg,
errstr);
default:
addarg(&arglist, ch, optarg);
break;
@ -237,6 +271,9 @@ main(int argc, char *argv[])
optarg = NULL;
}
if (name != NULL && strlen(name) >= MAXLOGNAME)
errx(EX_USAGE, "name too long: %s", name);
/*
* Must be root to attempt an update
*/
@ -265,7 +302,7 @@ main(int argc, char *argv[])
*/
conf.userconf = read_userconfig(config);
ch = funcs[which] (mode, &arglist);
ch = funcs[which] (mode, name, id, &arglist);
/*
* If everything went ok, and we've been asked to update

4
usr.sbin/pw/pw.h
View File

@ -82,8 +82,8 @@ int write_userconfig(char const * file);
struct carg *addarg(struct cargs * _args, int ch, char *argstr);
struct carg *getarg(struct cargs * _args, int ch);
int pw_user(int mode, struct cargs * _args);
int pw_group(int mode, struct cargs * _args);
int pw_user(int mode, char *name, long id, struct cargs * _args);
int pw_group(int mode, char *name, long id, struct cargs * _args);
char *pw_checkname(char *name, int gecos);
int addnispwent(const char *path, struct passwd *pwd);

62
usr.sbin/pw/pw_group.c
View File

@ -48,12 +48,10 @@ static int print_group(struct group * grp);
static gid_t gr_gidpolicy(struct userconf * cnf, struct cargs * args);
int
pw_group(int mode, struct cargs * args)
pw_group(int mode, char *name, long id, struct cargs * args)
{
int rc;
struct carg *a_newname = getarg(args, 'l');
struct carg *a_name = getarg(args, 'n');
struct carg *a_gid = getarg(args, 'g');
struct carg *arg;
struct group *grp = NULL;
int grmembers = 0;
@ -68,11 +66,6 @@ pw_group(int mode, struct cargs * args)
NULL
};
if (a_gid != NULL) {
if (strspn(a_gid->val, "0123456789") != strlen(a_gid->val))
errx(EX_USAGE, "-g expects a number");
}
if (mode == M_LOCK || mode == M_UNLOCK)
errx(EX_USAGE, "'lock' command is not available for groups");
@ -95,67 +88,63 @@ pw_group(int mode, struct cargs * args)
ENDGRENT();
return EXIT_SUCCESS;
}
if (a_gid == NULL) {
if (a_name == NULL)
errx(EX_DATAERR, "group name or id required");
if (id < 0 && name == NULL)
errx(EX_DATAERR, "group name or id required");
if (mode != M_ADD && grp == NULL && isdigit((unsigned char)*a_name->val)) {
(a_gid = a_name)->ch = 'g';
a_name = NULL;
}
}
grp = (a_name != NULL) ? GETGRNAM(a_name->val) : GETGRGID((gid_t) atoi(a_gid->val));
grp = (name != NULL) ? GETGRNAM(name) : GETGRGID(id);
if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
if (a_name == NULL && grp == NULL) /* Try harder */
grp = GETGRGID(atoi(a_gid->val));
if (name == NULL && grp == NULL) /* Try harder */
grp = GETGRGID(id);
if (grp == NULL) {
if (mode == M_PRINT && getarg(args, 'F')) {
char *fmems[1];
fmems[0] = NULL;
fakegroup.gr_name = a_name ? a_name->val : "nogroup";
fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : (gid_t)-1;
fakegroup.gr_name = name ? name : "nogroup";
fakegroup.gr_gid = (gid_t) id;
fakegroup.gr_mem = fmems;
return print_group(&fakegroup);
}
errx(EX_DATAERR, "unknown group `%s'", a_name ? a_name->val : a_gid->val);
if (name == NULL)
errx(EX_DATAERR, "unknown group `%s'", name);
else
errx(EX_DATAERR, "unknown group `%ld'", id);
}
if (a_name == NULL) /* Needed later */
a_name = addarg(args, 'n', grp->gr_name);
if (name == NULL) /* Needed later */
name = grp->gr_name;
/*
* Handle deletions now
*/
if (mode == M_DELETE) {
gid_t gid = grp->gr_gid;
rc = delgrent(grp);
if (rc == -1)
err(EX_IOERR, "group '%s' not available (NIS?)", grp->gr_name);
err(EX_IOERR, "group '%s' not available (NIS?)",
name);
else if (rc != 0) {
err(EX_IOERR, "group update");
}
pw_log(cnf, mode, W_GROUP, "%s(%u) removed", a_name->val, gid);
pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", name, id);
return EXIT_SUCCESS;
} else if (mode == M_PRINT)
return print_group(grp);
if (a_gid)
grp->gr_gid = (gid_t) atoi(a_gid->val);
if (id > 0)
grp->gr_gid = (gid_t) id;
if (a_newname != NULL)
grp->gr_name = pw_checkname(a_newname->val, 0);
} else {
if (a_name == NULL) /* Required */
if (name == NULL) /* Required */
errx(EX_DATAERR, "group name required");
else if (grp != NULL) /* Exists */
errx(EX_DATAERR, "group name `%s' already exists", a_name->val);
errx(EX_DATAERR, "group name `%s' already exists", name);
extendarray(&members, &grmembers, 200);
members[0] = NULL;
grp = &fakegroup;
grp->gr_name = pw_checkname(a_name->val, 0);
grp->gr_name = pw_checkname(name, 0);
grp->gr_passwd = "*";
grp->gr_gid = gr_gidpolicy(cnf, args);
grp->gr_mem = members;
@ -265,7 +254,7 @@ pw_group(int mode, struct cargs * args)
grp->gr_name);
else
err(EX_IOERR, "group update");
} else if (mode == M_UPDATE && (rc = chggrent(a_name->val, grp)) != 0) {
} else if (mode == M_UPDATE && (rc = chggrent(name, grp)) != 0) {
if (rc == -1)
errx(EX_IOERR, "group '%s' not available (NIS?)",
grp->gr_name);
@ -273,9 +262,10 @@ pw_group(int mode, struct cargs * args)
err(EX_IOERR, "group update");
}
arg = a_newname != NULL ? a_newname : a_name;
if (a_newname != NULL)
name = a_newname->val;
/* grp may have been invalidated */
if ((grp = GETGRNAM(arg->val)) == NULL)
if ((grp = GETGRNAM(name)) == NULL)
errx(EX_SOFTWARE, "group disappeared during update");
pw_log(cnf, mode, W_GROUP, "%s(%u)", grp->gr_name, grp->gr_gid);

95
usr.sbin/pw/pw_user.c
View File

@ -52,7 +52,7 @@ static const char rcsid[] =
static char locked_str[] = "*LOCKED*";
static int delete_user(struct userconf *cnf, struct passwd *pwd,
struct carg *a_name, int delete, int mode);
char *name, int delete, int mode);
static int print_user(struct passwd * pwd);
static uid_t pw_uidpolicy(struct userconf * cnf, struct cargs * args);
static uid_t pw_gidpolicy(struct cargs * args, char *nam, gid_t prefer);
@ -119,13 +119,11 @@ create_and_populate_homedir(int mode, struct passwd *pwd)
*/
int
pw_user(int mode, struct cargs * args)
pw_user(int mode, char *name, long id, struct cargs * args)
{
int rc, edited = 0;
char *p = NULL;
char *passtmp;
struct carg *a_name;
struct carg *a_uid;
struct carg *arg;
struct passwd *pwd = NULL;
struct group *grp;
@ -166,7 +164,7 @@ pw_user(int mode, struct cargs * args)
if (getarg(args, 'q'))
return next;
printf("%u:", next);
pw_group(mode, args);
pw_group(mode, name, -1, args);
return EXIT_SUCCESS;
}
@ -323,29 +321,11 @@ pw_user(int mode, struct cargs * args)
return EXIT_SUCCESS;
}
if ((a_name = getarg(args, 'n')) != NULL)
pwd = GETPWNAM(pw_checkname(a_name->val, 0));
a_uid = getarg(args, 'u');
if (name != NULL)
pwd = GETPWNAM(pw_checkname(name, 0));
if (a_uid == NULL) {
if (a_name == NULL)
errx(EX_DATAERR, "user name or id required");
/*
* Determine whether 'n' switch is name or uid - we don't
* really don't really care which we have, but we need to
* know.
*/
if (mode != M_ADD && pwd == NULL
&& strspn(a_name->val, "0123456789") == strlen(a_name->val)
&& *a_name->val) {
(a_uid = a_name)->ch = 'u';
a_name = NULL;
}
} else {
if (strspn(a_uid->val, "0123456789") != strlen(a_uid->val))
errx(EX_USAGE, "-u expects a number");
}
if (id < 0 && name == NULL)
errx(EX_DATAERR, "user name or id required");
/*
* Update, delete & print require that the user exists
@ -353,22 +333,22 @@ pw_user(int mode, struct cargs * args)
if (mode == M_UPDATE || mode == M_DELETE ||
mode == M_PRINT || mode == M_LOCK || mode == M_UNLOCK) {
if (a_name == NULL && pwd == NULL) /* Try harder */
pwd = GETPWUID(atoi(a_uid->val));
if (name == NULL && pwd == NULL) /* Try harder */
pwd = GETPWUID(id);
if (pwd == NULL) {
if (mode == M_PRINT && getarg(args, 'F')) {
fakeuser.pw_name = a_name ? a_name->val : "nouser";
fakeuser.pw_uid = a_uid ? (uid_t) atol(a_uid->val) : (uid_t) -1;
fakeuser.pw_name = name ? name : "nouser";
fakeuser.pw_uid = (uid_t) id;
return print_user(&fakeuser);
}
if (a_name == NULL)
errx(EX_NOUSER, "no such uid `%s'", a_uid->val);
errx(EX_NOUSER, "no such user `%s'", a_name->val);
if (name == NULL)
errx(EX_NOUSER, "no such uid `%ld'", id);
errx(EX_NOUSER, "no such user `%s'", name);
}
if (a_name == NULL) /* May be needed later */
a_name = addarg(args, 'n', newstr(pwd->pw_name));
if (name == NULL)
name = pwd->pw_name;
/*
* The M_LOCK and M_UNLOCK functions simply add or remove
@ -394,7 +374,7 @@ pw_user(int mode, struct cargs * args)
pwd->pw_passwd += sizeof(locked_str)-1;
edited = 1;
} else if (mode == M_DELETE)
return (delete_user(cnf, pwd, a_name,
return (delete_user(cnf, pwd, name,
getarg(args, 'r') != NULL, mode));
else if (mode == M_PRINT)
return print_user(pwd);
@ -511,16 +491,16 @@ pw_user(int mode, struct cargs * args)
* Add code
*/
if (a_name == NULL) /* Required */
if (name == NULL) /* Required */
errx(EX_DATAERR, "login name required");
else if ((pwd = GETPWNAM(a_name->val)) != NULL) /* Exists */
errx(EX_DATAERR, "login name `%s' already exists", a_name->val);
else if ((pwd = GETPWNAM(name)) != NULL) /* Exists */
errx(EX_DATAERR, "login name `%s' already exists", name);
/*
* Now, set up defaults for a new user
*/
pwd = &fakeuser;
pwd->pw_name = a_name->val;
pwd->pw_name = name;
pwd->pw_class = cnf->default_class ? cnf->default_class : "";
pwd->pw_uid = pw_uidpolicy(cnf, args);
pwd->pw_gid = pw_gidpolicy(args, pwd->pw_name, (gid_t) pwd->pw_uid);
@ -635,13 +615,13 @@ pw_user(int mode, struct cargs * args)
}
} else if (mode == M_UPDATE || mode == M_LOCK || mode == M_UNLOCK) {
if (edited) { /* Only updated this if required */
rc = chgpwent(a_name->val, pwd);
rc = chgpwent(name, pwd);
if (rc == -1)
errx(EX_IOERR, "user '%s' does not exist (NIS?)", pwd->pw_name);
else if (rc != 0)
err(EX_IOERR, "passwd file update");
if ( cnf->nispasswd && *cnf->nispasswd=='/') {
rc = chgnispwent(cnf->nispasswd, a_name->val, pwd);
rc = chgnispwent(cnf->nispasswd, name, pwd);
if (rc == -1)
warn("User '%s' not found in NIS passwd", pwd->pw_name);
else
@ -693,16 +673,16 @@ pw_user(int mode, struct cargs * args)
/* go get a current version of pwd */
pwd = GETPWNAM(a_name->val);
pwd = GETPWNAM(name);
if (pwd == NULL) {
/* This will fail when we rename, so special case that */
if (mode == M_UPDATE && (arg = getarg(args, 'l')) != NULL) {
a_name->val = arg->val; /* update new name */
pwd = GETPWNAM(a_name->val); /* refetch renamed rec */
name = arg->val; /* update new name */
pwd = GETPWNAM(name); /* refetch renamed rec */
}
}
if (pwd == NULL) /* can't go on without this */
errx(EX_NOUSER, "user '%s' disappeared during update", a_name->val);
errx(EX_NOUSER, "user '%s' disappeared during update", name);
grp = GETGRGID(pwd->pw_gid);
pw_log(cnf, mode, W_USER, "%s(%u):%s(%u):%s:%s:%s",
@ -849,7 +829,6 @@ pw_gidpolicy(struct cargs * args, char *nam, gid_t prefer)
char tmp[32];
LIST_INIT(&grpargs);
addarg(&grpargs, 'n', nam);
/*
* We need to auto-create a group with the user's name. We
@ -866,11 +845,11 @@ pw_gidpolicy(struct cargs * args, char *nam, gid_t prefer)
}
if (conf.dryrun) {
addarg(&grpargs, 'q', NULL);
gid = pw_group(M_NEXT, &grpargs);
gid = pw_group(M_NEXT, nam, -1, &grpargs);
}
else
{
pw_group(M_ADD, &grpargs);
pw_group(M_ADD, nam, -1, &grpargs);
if ((grp = GETGRNAM(nam)) != NULL)
gid = grp->gr_gid;
}
@ -1048,7 +1027,7 @@ pw_password(struct userconf * cnf, struct cargs * args, char const * user)
}
static int
delete_user(struct userconf *cnf, struct passwd *pwd, struct carg *a_name,
delete_user(struct userconf *cnf, struct passwd *pwd, char *name,
int delete, int mode)
{
char file[MAXPATHLEN];
@ -1097,7 +1076,7 @@ delete_user(struct userconf *cnf, struct passwd *pwd, struct carg *a_name,
err(EX_IOERR, "passwd update");
if (cnf->nispasswd && *cnf->nispasswd=='/') {
rc = delnispwent(cnf->nispasswd, a_name->val);
rc = delnispwent(cnf->nispasswd, name);
if (rc == -1)
warnx("WARNING: user '%s' does not exist in NIS passwd", pwd->pw_name);
else if (rc != 0)
@ -1105,11 +1084,11 @@ delete_user(struct userconf *cnf, struct passwd *pwd, struct carg *a_name,
/* non-fatal */
}
grp = GETGRNAM(a_name->val);
grp = GETGRNAM(name);
if (grp != NULL &&
(grp->gr_mem == NULL || *grp->gr_mem == NULL) &&
strcmp(a_name->val, grname) == 0)
delgrent(GETGRNAM(a_name->val));
strcmp(name, grname) == 0)
delgrent(GETGRNAM(name));
SETGRENT();
while ((grp = GETGRENT()) != NULL) {
int i, j;
@ -1118,7 +1097,7 @@ delete_user(struct userconf *cnf, struct passwd *pwd, struct carg *a_name,
continue;
for (i = 0; grp->gr_mem[i] != NULL; i++) {
if (strcmp(grp->gr_mem[i], a_name->val) != 0)
if (strcmp(grp->gr_mem[i], name) != 0)
continue;
for (j = i; grp->gr_mem[j] != NULL; j++)
@ -1129,7 +1108,7 @@ delete_user(struct userconf *cnf, struct passwd *pwd, struct carg *a_name,
}
ENDGRENT();
pw_log(cnf, mode, W_USER, "%s(%u) account removed", a_name->val, uid);
pw_log(cnf, mode, W_USER, "%s(%u) account removed", name, uid);
if (!PWALTDIR()) {
/*
@ -1150,7 +1129,7 @@ delete_user(struct userconf *cnf, struct passwd *pwd, struct carg *a_name,
stat(home, &st) != -1) {
rm_r(home, uid);
pw_log(cnf, mode, W_USER, "%s(%u) home '%s' %sremoved",
a_name->val, uid, home,
name, uid, home,
stat(home, &st) == -1 ? "" : "not completely ");
}
}

8
usr.sbin/pw/tests/pw_useradd.sh
View File

@ -169,6 +169,13 @@ user_add_password_expiration_date_relative_body() {
atf_fail "Expiration time($TIME) was not within $EPOCH - $BUF seconds."
}
atf_test_case user_add_name_too_long
user_add_name_too_long_body() {
populate_etc_skel
atf_check -e match:"too long" -s exit:64 \
${PW} useradd name_very_vert_very_very_very_long
}
atf_init_test_cases() {
atf_add_test_case user_add
atf_add_test_case user_add_noupdate
@ -185,4 +192,5 @@ atf_init_test_cases() {
atf_add_test_case user_add_password_expiration_date_numeric
atf_add_test_case user_add_password_expiration_date_month
atf_add_test_case user_add_password_expiration_date_relative
atf_add_test_case user_add_name_too_long
}