1 | #define _GNU_SOURCE
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2 | #include "pwf.h"
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3 | #include <grp.h>
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4 | #include <string.h>
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5 | #include <limits.h>
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6 | #include <stdio.h>
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7 | #include <stdlib.h>
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8 | #include <byteswap.h>
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9 | #include <errno.h>
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10 | #include "nscd.h"
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11 |
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12 | int getgrouplist(const char *user, gid_t gid, gid_t *groups, int *ngroups)
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13 | {
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14 | int rv, nlim, ret = -1;
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15 | ssize_t i, n = 1;
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16 | struct group gr;
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17 | struct group *res;
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18 | FILE *f;
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19 | int swap = 0;
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20 | int32_t resp[INITGR_LEN];
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21 | uint32_t *nscdbuf = 0;
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22 | char *buf = 0;
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23 | char **mem = 0;
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24 | size_t nmem = 0;
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25 | size_t size;
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26 | nlim = *ngroups;
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27 | if (nlim >= 1) *groups++ = gid;
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28 |
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29 | f = __nscd_query(GETINITGR, user, resp, sizeof resp, &swap);
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30 | if (!f) goto cleanup;
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31 | if (resp[INITGRFOUND]) {
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32 | nscdbuf = calloc(resp[INITGRNGRPS], sizeof(uint32_t));
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33 | if (!nscdbuf) goto cleanup;
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34 | if (!fread(nscdbuf, sizeof(*nscdbuf)*resp[INITGRNGRPS], 1, f)) {
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35 | if (!ferror(f)) errno = EIO;
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36 | goto cleanup;
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37 | }
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38 | if (swap) {
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39 | for (i = 0; i < resp[INITGRNGRPS]; i++)
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40 | nscdbuf[i] = bswap_32(nscdbuf[i]);
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41 | }
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42 | }
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43 | fclose(f);
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44 |
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45 | f = fopen("/etc/group", "rbe");
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46 | if (!f && errno != ENOENT && errno != ENOTDIR)
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47 | goto cleanup;
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48 |
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49 | if (f) {
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50 | while (!(rv = __getgrent_a(f, &gr, &buf, &size, &mem, &nmem, &res)) && res) {
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51 | if (nscdbuf)
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52 | for (i=0; i < resp[INITGRNGRPS]; i++) {
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53 | if (nscdbuf[i] == gr.gr_gid) nscdbuf[i] = gid;
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54 | }
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55 | for (i=0; gr.gr_mem[i] && strcmp(user, gr.gr_mem[i]); i++);
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56 | if (!gr.gr_mem[i]) continue;
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57 | if (++n <= nlim) *groups++ = gr.gr_gid;
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58 | }
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59 | if (rv) {
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60 | errno = rv;
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61 | goto cleanup;
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62 | }
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63 | }
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64 | if (nscdbuf) {
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65 | for(i=0; i < resp[INITGRNGRPS]; i++) {
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66 | if (nscdbuf[i] != gid)
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67 | if(++n <= nlim) *groups++ = nscdbuf[i];
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68 | }
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69 | }
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70 |
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71 | ret = n > nlim ? -1 : n;
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72 | *ngroups = n;
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73 |
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74 | cleanup:
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75 | if (f) fclose(f);
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76 | free(nscdbuf);
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77 | free(buf);
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78 | free(mem);
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79 | return ret;
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80 | }
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