109 lines
2.0 KiB
C
109 lines
2.0 KiB
C
#include <unistd.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <asm/page.h>
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#include "selinux_internal.h"
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#include "policy.h"
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#include <limits.h>
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int security_compute_user_raw(security_context_t scon,
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const char *user,
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security_context_t **con)
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{
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char path[PATH_MAX];
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char **ary;
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char *buf, *ptr;
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size_t size;
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int fd, ret;
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unsigned int i, nel;
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snprintf(path, sizeof path, "%s/user", selinux_mnt);
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fd = open(path, O_RDWR);
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if (fd < 0)
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return -1;
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size = PAGE_SIZE;
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buf = malloc(size);
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if (!buf) {
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ret = -1;
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goto out;
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}
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snprintf(buf, size, "%s %s", scon, user);
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ret = write(fd, buf, strlen(buf));
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if (ret < 0)
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goto out2;
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memset(buf, 0, size);
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ret = read(fd, buf, size-1);
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if (ret < 0)
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goto out2;
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if (sscanf(buf, "%u", &nel) != 1) {
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ret = -1;
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goto out2;
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}
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ary = malloc((nel+1)*sizeof(char*));
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if (!ary) {
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ret = -1;
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goto out2;
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}
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ptr = buf + strlen(buf) + 1;
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for (i = 0; i < nel; i++) {
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ary[i] = strdup(ptr);
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if (!ary[i]) {
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freeconary(ary);
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ret = -1;
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goto out2;
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}
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ptr += strlen(ptr) + 1;
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}
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ary[nel] = NULL;
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*con = ary;
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ret = 0;
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out2:
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free(buf);
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out:
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close(fd);
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return ret;
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}
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hidden_def(security_compute_user_raw)
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int security_compute_user(security_context_t scon,
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const char *user,
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security_context_t **con)
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{
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int ret;
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security_context_t rscon = scon;
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if (context_translations && trans_to_raw_context(scon, &rscon))
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return -1;
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ret = security_compute_user_raw(rscon, user, con);
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if (context_translations) {
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freecon(rscon);
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if (!ret) {
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security_context_t *ptr, tmpcon;
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for (ptr = *con; *ptr; ptr++) {
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if (raw_to_trans_context(*ptr, &tmpcon)) {
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freeconary(*con);
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*con = NULL;
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return -1;
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}
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freecon(*ptr);
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*ptr = tmpcon;
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}
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}
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}
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return ret;
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}
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hidden_def(security_compute_user)
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