From 8daa83a594a2e98f39d764422bfbdbc62c9efd44 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 19:20:00 +0200 Subject: Adding upstream version 2:4.20.0+dfsg. Signed-off-by: Daniel Baumann --- examples/nss/nss_winbind.c | 422 +++++++++++++++++++++++++++++++++++++++++++++ examples/nss/nss_winbind.h | 97 +++++++++++ examples/nss/wbtest.c | 111 ++++++++++++ 3 files changed, 630 insertions(+) create mode 100644 examples/nss/nss_winbind.c create mode 100644 examples/nss/nss_winbind.h create mode 100644 examples/nss/wbtest.c (limited to 'examples/nss') diff --git a/examples/nss/nss_winbind.c b/examples/nss/nss_winbind.c new file mode 100644 index 0000000..968cc7a --- /dev/null +++ b/examples/nss/nss_winbind.c @@ -0,0 +1,422 @@ +/* + nss sample code for extended winbindd functionality + + Copyright (C) Andrew Tridgell (tridge@samba.org) + + you are free to use this code in any way you see fit, including + without restriction, using this code in your own products. You do + not need to give any attribution. +*/ + +#define _GNU_SOURCE + +#include +#include +#include +#include +#include +#include +#include + +#include "nss_winbind.h" + +/* + find a function in the nss library +*/ +static void *find_fn(struct nss_state *nss, const char *name) +{ + void *res; + char *s = NULL; + + asprintf(&s, "_nss_%s_%s", nss->nss_name, name); + if (!s) { + errno = ENOMEM; + return NULL; + } + res = dlsym(nss->dl_handle, s); + free(s); + if (!res) { + errno = ENOENT; + return NULL; + } + return res; +} + +/* + establish a link to the nss library + Return 0 on success and -1 on error +*/ +int nss_open(struct nss_state *nss, const char *nss_path) +{ + char *p; + p = strrchr(nss_path, '_'); + if (!p) { + errno = EINVAL; + return -1; + } + + nss->nss_name = strdup(p+1); + p = strchr(nss->nss_name, '.'); + if (p) *p = 0; + + nss->dl_handle = dlopen(nss_path, RTLD_LAZY); + if (!nss->dl_handle) { + free(nss->nss_name); + return -1; + } + + return 0; +} + +/* + close and cleanup a nss state +*/ +void nss_close(struct nss_state *nss) +{ + free(nss->nss_name); + dlclose(nss->dl_handle); +} + +/* + make a getpwnam call. + Return 0 on success and -1 on error +*/ +int nss_getpwent(struct nss_state *nss, struct passwd *pwd) +{ + enum nss_status (*_nss_getpwent_r)(struct passwd *, char *, + size_t , int *); + enum nss_status status; + int nss_errno = 0; + + _nss_getpwent_r = find_fn(nss, "getpwent_r"); + + if (!_nss_getpwent_r) { + return -1; + } + + status = _nss_getpwent_r(pwd, nss->pwnam_buf, sizeof(nss->pwnam_buf), + &nss_errno); + if (status == NSS_STATUS_NOTFOUND) { + errno = ENOENT; + return -1; + } + if (status != NSS_STATUS_SUCCESS) { + errno = nss_errno; + return -1; + } + + return 0; +} + +/* + make a setpwent call. + Return 0 on success and -1 on error +*/ +int nss_setpwent(struct nss_state *nss) +{ + enum nss_status (*_nss_setpwent)(void) = find_fn(nss, "setpwent"); + enum nss_status status; + if (!_nss_setpwent) { + return -1; + } + status = _nss_setpwent(); + if (status != NSS_STATUS_SUCCESS) { + errno = EINVAL; + return -1; + } + return 0; +} + +/* + make a endpwent call. + Return 0 on success and -1 on error +*/ +int nss_endpwent(struct nss_state *nss) +{ + enum nss_status (*_nss_endpwent)(void) = find_fn(nss, "endpwent"); + enum nss_status status; + if (!_nss_endpwent) { + return -1; + } + status = _nss_endpwent(); + if (status != NSS_STATUS_SUCCESS) { + errno = EINVAL; + return -1; + } + return 0; +} + + +/* + convert a name to a SID + caller frees + Return 0 on success and -1 on error +*/ +int nss_nametosid(struct nss_state *nss, const char *name, char **sid) +{ + enum nss_status (*_nss_nametosid)(const char *, char **, char *, + size_t, int *); + enum nss_status status; + int nss_errno = 0; + char buf[200]; + + _nss_nametosid = find_fn(nss, "nametosid"); + + if (!_nss_nametosid) { + return -1; + } + + status = _nss_nametosid(name, sid, buf, sizeof(buf), &nss_errno); + if (status == NSS_STATUS_NOTFOUND) { + errno = ENOENT; + return -1; + } + if (status != NSS_STATUS_SUCCESS) { + errno = nss_errno; + return -1; + } + + *sid = strdup(*sid); + + return 0; +} + +/* + convert a SID to a name + caller frees + Return 0 on success and -1 on error +*/ +int nss_sidtoname(struct nss_state *nss, const char *sid, char **name) +{ + enum nss_status (*_nss_sidtoname)(const char *, char **, char *, + size_t, int *); + enum nss_status status; + int nss_errno = 0; + char buf[200]; + + _nss_sidtoname = find_fn(nss, "sidtoname"); + + if (!_nss_sidtoname) { + return -1; + } + + status = _nss_sidtoname(sid, name, buf, sizeof(buf), &nss_errno); + if (status == NSS_STATUS_NOTFOUND) { + errno = ENOENT; + return -1; + } + if (status != NSS_STATUS_SUCCESS) { + errno = nss_errno; + return -1; + } + + *name = strdup(*name); + + return 0; +} + +/* + return a list of group SIDs for a user SID + the returned list is NULL terminated + Return 0 on success and -1 on error +*/ +int nss_getusersids(struct nss_state *nss, const char *user_sid, char ***sids) +{ + enum nss_status (*_nss_getusersids)(const char *, char **, int *, + char *, size_t, int *); + enum nss_status status; + int nss_errno = 0; + char *s; + int i, num_groups = 0; + unsigned bufsize = 10; + char *buf; + + _nss_getusersids = find_fn(nss, "getusersids"); + + if (!_nss_getusersids) { + return -1; + } + +again: + buf = malloc(bufsize); + if (!buf) { + errno = ENOMEM; + return -1; + } + + status = _nss_getusersids(user_sid, &s, &num_groups, buf, bufsize, + &nss_errno); + + if (status == NSS_STATUS_NOTFOUND) { + errno = ENOENT; + free(buf); + return -1; + } + + if (status == NSS_STATUS_TRYAGAIN) { + bufsize *= 2; + free(buf); + goto again; + } + + if (status != NSS_STATUS_SUCCESS) { + free(buf); + errno = nss_errno; + return -1; + } + + if (num_groups == 0) { + free(buf); + return 0; + } + + *sids = (char **)malloc(sizeof(char *) * (num_groups+1)); + if (! *sids) { + errno = ENOMEM; + free(buf); + return -1; + } + + for (i=0;i +#include + +struct nss_state { + void *dl_handle; + char *nss_name; + char pwnam_buf[512]; +}; + +/* + establish a link to the nss library + Return 0 on success and -1 on error +*/ +int nss_open(struct nss_state *nss, const char *nss_path); + +/* + close and cleanup a nss state +*/ +void nss_close(struct nss_state *nss); + +/* + make a getpwnam call. + Return 0 on success and -1 on error +*/ +int nss_getpwent(struct nss_state *nss, struct passwd *pwd); + +/* + make a setpwent call. + Return 0 on success and -1 on error +*/ +int nss_setpwent(struct nss_state *nss); + +/* + make a endpwent call. + Return 0 on success and -1 on error +*/ +int nss_endpwent(struct nss_state *nss); + +/* + convert a name to a SID + caller frees + Return 0 on success and -1 on error +*/ +int nss_nametosid(struct nss_state *nss, const char *name, char **sid); + +/* + convert a SID to a name + caller frees + Return 0 on success and -1 on error +*/ +int nss_sidtoname(struct nss_state *nss, const char *sid, char **name); + +/* + return a list of group SIDs for a user SID + the returned list is NULL terminated + Return 0 on success and -1 on error +*/ +int nss_getusersids(struct nss_state *nss, const char *user_sid, char ***sids); + +/* + convert a sid to a uid + Return 0 on success and -1 on error +*/ +int nss_sidtouid(struct nss_state *nss, const char *sid, uid_t *uid); + +/* + convert a sid to a gid + Return 0 on success and -1 on error +*/ +int nss_sidtogid(struct nss_state *nss, const char *sid, gid_t *gid); + +/* + convert a uid to a sid + caller frees + Return 0 on success and -1 on error +*/ +int nss_uidtosid(struct nss_state *nss, uid_t uid, char **sid); + +/* + convert a gid to a sid + caller frees + Return 0 on success and -1 on error +*/ +int nss_gidtosid(struct nss_state *nss, gid_t gid, char **sid); diff --git a/examples/nss/wbtest.c b/examples/nss/wbtest.c new file mode 100644 index 0000000..14265bd --- /dev/null +++ b/examples/nss/wbtest.c @@ -0,0 +1,111 @@ +/* + nss sample code for extended winbindd functionality + + Copyright (C) Andrew Tridgell (tridge@samba.org) + + you are free to use this code in any way you see fit, including + without restriction, using this code in your own products. You do + not need to give any attribution. +*/ + +/* + compile like this: + + cc -o wbtest wbtest.c nss_winbind.c -ldl + + and run like this: + + ./wbtest /lib/libnss_winbind.so +*/ + +#define _GNU_SOURCE + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "nss_winbind.h" + +static int nss_test_users(struct nss_state *nss) +{ + struct passwd pwd; + + if (nss_setpwent(nss) != 0) { + perror("setpwent"); + return -1; + } + + /* loop over all users */ + while ((nss_getpwent(nss, &pwd) == 0)) { + char *sid, **group_sids, *name2; + int i; + + printf("User %s\n", pwd.pw_name); + if (nss_nametosid(nss, pwd.pw_name, &sid) != 0) { + perror("nametosid"); + return -1; + } + printf("\tSID %s\n", sid); + + if (nss_sidtoname(nss, sid, &name2) != 0) { + perror("sidtoname"); + return -1; + } + printf("\tSID->name %s\n", name2); + + if (nss_getusersids(nss, sid, &group_sids) != 0) { + perror("getusersids"); + return -1; + } + + printf("\tGroups:\n"); + for (i=0; group_sids[i]; i++) { + printf("\t\t%s\n", group_sids[i]); + free(group_sids[i]); + } + + free(sid); + free(name2); + free(group_sids); + } + + + if (nss_endpwent(nss) != 0) { + perror("endpwent"); + return -1; + } + + return 0; +} + + +/* + main program. It lists all users, listing user SIDs for each user + */ +int main(int argc, char *argv[]) +{ + struct nss_state nss; + const char *so_path = "/lib/libnss_winbind.so"; + int ret; + + if (argc > 1) { + so_path = argv[1]; + } + + if (nss_open(&nss, so_path) != 0) { + perror("nss_open"); + exit(1); + } + + ret = nss_test_users(&nss); + + nss_close(&nss); + + return ret; +} -- cgit v1.2.3