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SELinux½ÓÄÉÁËÇ¿ÖÆ»á¼û¿ØÖÆ£¨MAC£©»úÖÆ£¬Óë¹Å°åµÄ×ÔÖ÷»á¼û¿ØÖÆ£¨DAC£©ÓÐËùÇø±ð¡£ÔÚDACģʽÏ£¬»á¼û¿ØÖÆÈ¡¾öÓÚ×ÊÔ´µÄËùÓÐÕߣ¬¼´×ÊÔ´µÄ»á¼ûȨÏÞÓÉ×ÊÔ´µÄËùÓÐÕß×ÔÐоöÒé¡£¶øÔÚSELinuxµÄMACģʽÏ£¬ËùÓеÄ×ÊÔ´»á¼û¶¼Êܵ½ÑÏ¿áµÄÇ¿ÖÆÕ½ÂÔ¿ØÖÆ£¬°üÀ¨Àú³Ì¡¢Îļþ¡¢socketµÈ¡£ÕâÒâζ×Å×ÝȻһ¸öÓû§»ñµÃÁËrootȨÏÞ£¬Ò²ÎÞ·¨ÈƹýSELinuxµÄ± £»¤»úÖÆ¡£

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Ê×ÏÈ£¬ÎÒÃÇÐèҪȷ±£ÏµÍ³ÖÐ×°ÖÃÁËSELinux£¬²¢ÇÒÆôÓÃÁËSELinux¡£È»ºó£¬ÎÒÃǽ¨ÉèÒ»¸öÃûΪ”selinux_example.c”µÄÎļþ£¬±àдÒÔÏ´úÂ룺

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>

int main() {
    char *file_path = "/tmp/example.txt";
    char *content = "Hello, SELinux!";

    int fd = open(file_path, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR);
    if (fd < 0) {
        perror("open");
        return 1;
    }

    if (write(fd, content, sizeof(content)) < 0) {
        perror("write");
        close(fd);
        return 1;
    }

    close(fd);

    return 0;
}

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ÔÚÕâ¸ö³ÌÐòÖУ¬ÎÒÃÇʵÑé·­¿ªÒ»¸öÃûΪ”example.txt”µÄÎļþ²¢Ð´ÈëÄÚÈÝ”Hello, SELinux!”¡£½ÓÏÂÀ´£¬ÎÒÃÇÐèҪΪ¸Ã³ÌÐò½¨ÉèÒ»¸öSELinuxÇå¾²Õ½ÂÔ¡£ÎÒÃÇ¿ÉÒÔʹÓÔaudit2allow”¹¤¾ßÀ´ÌìÉúÒ»¸öÔÝʱSELinuxÕ½ÂÔ£¬È»ºó¼ÓÔØÕâ¸öÕ½ÂÔ¡£Ö´ÐÐÒÔÏÂÏÂÁ

audit2allow -a -M my_selinux_example
semodule -i my_selinux_example.pp

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grep 'avc: ' /var/log/audit/audit.log | audit2why

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