通过nginx远程执行shell

编程语言 2018-05-12 08:37:47 阅读次数: 14
saltstack远程执行shell，远程管理等返回json已经很成熟，扩展也很好用
原理其实就是通过网络协议，aes加密后，用python本地执行shell等系统调用

其实nginx也可以做成远程执行shell
利用nginx的request的args参数可以获取url
并自定义解析url的decode方法，比如%20变成空格
方法如下 
void hao_urldecode(char *dest, const char *src)  
{  
    const char *p = src;  
    char code[3] = {0};  
    unsigned long ascii = 0;  
    char *end = NULL;  
  
    while(*p)  
    {     
        if(*p == '%')  
        {     
            memcpy(code, ++p, 2);   
            ascii = strtoul(code, &end, 16);  
            *dest++ = (char)ascii;  
            p += 2;  
        }     
        else  
            *dest++ = *p++;  
    }     
}

nginx的args后面会跟着一个空格 HTTP/1.1
所以截取字符串把url还原成命令，使用system函数调用执行shell 
    char urlcmd[255]= {"0"};                                                                                                                                 
    //    strcpy( urlcmd, r->args.data);
    printf("mycmd %s",urlcmd);
    char *mycmd=(char *)r->args.data;
    strcpy( urlcmd, mycmd);//snprintf
    char *abc;
    abc=strtok(urlcmd," ");
    char haoout[sizeof abc] = {0};
       hao_urldecode(haoout,abc);
    system(haoout)



完整代码的
简单例子如下：
ngx_http_echo_module.c 
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <time.h>
#include "haolog.h"

#include <ngx_log.h>
/* Module config */
typedef struct {
        ngx_str_t  ed;
} ngx_http_echo_loc_conf_t;
static char *ngx_http_echo(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static void *ngx_http_echo_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_echo_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child);
/* Directives */
static ngx_command_t  ngx_http_echo_commands[] = {
        { 
                ngx_string("echo"),
                NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
                ngx_http_echo,
                NGX_HTTP_LOC_CONF_OFFSET,
                offsetof(ngx_http_echo_loc_conf_t, ed),
                NULL 
        },
        ngx_null_command
};
/* Http context of the module */
static ngx_http_module_t  ngx_http_echo_module_ctx = {
        NULL,                                  /* preconfiguration */
        NULL,                                  /* postconfiguration */
        NULL,                                  /* create main configuration */
        NULL,                                  /* init main configuration */
        NULL,                                  /* create server configuration */
        NULL,                                  /* merge server configuration */
        ngx_http_echo_create_loc_conf,         /* create location configration */
        ngx_http_echo_merge_loc_conf           /* merge location configration */
};
/* Module */
ngx_module_t  ngx_http_echo_module = {
        NGX_MODULE_V1,
        &ngx_http_echo_module_ctx,             /* module context */
        ngx_http_echo_commands,                /* module directives */
        NGX_HTTP_MODULE,                       /* module type */
        NULL,                                  /* init master */
        NULL,                                  /* init module */
        NULL,                                  /* init process */
        NULL,                                  /* init thread */
        NULL,                                  /* exit thread */
        NULL,                                  /* exit process */
        NULL,                                  /* exit master */
        NGX_MODULE_V1_PADDING
};
void hao_urldecode(char *dest, const char *src)
{
    const char *p = src;
    char code[3] = {0};
    unsigned long ascii = 0;
    char *end = NULL;

    while(*p)
    {   
        if(*p == '%')
        {   
            memcpy(code, ++p, 2); 
            ascii = strtoul(code, &end, 16);
            *dest++ = (char)ascii;
            p += 2;
        }   
        else
            *dest++ = *p++;
    }   
}
/* Handler function */
        static ngx_int_t
ngx_http_echo_handler(ngx_http_request_t *r)
{
        DEBUG_LOG("haoning haohao .........ngx_http_echo_handler\n");
        ngx_log_stderr(0,"haoning: ngx_http_hello_world_handler\"%s\"","haohao" );
//      ngx_log_error(0,"haoning: ngx_http_hello_world_handler\"%s\"","haohao" );
        fprintf(stderr, "haoning hahahah:%s\r\n","ningning");
        fprintf(stderr,"haoning haohao subrequest in memory: %d\n", (int) r->subrequest_in_memory);
        fprintf(stderr,"haoning haohao  r->method : %d\n",(int) r->method);
        fprintf(stderr,"haoning haohao r->http_version: %d\n",(int) r->http_version) ;
        fprintf(stderr,"haoning haohao r->request_line.data: %s\n",r->request_line.data) ;
        fprintf(stderr,"haoning haohao r->uri.data): %s\n",r->uri.data);
        fprintf(stderr,"haoning haohao r->args.data: %s\n",r->args.data);

    //u_char *mycmd=(u_char *)r->args.data;                                                                                                                              
    //char *urlcmd=(char *) malloc( sizeof(char)*255 );//=(u_char *)r->args.data;                                                                                                                              
    //memset(urlcmd,0,sizeof(char)*255);
    char urlcmd[255]= {"0"};                                                                                                                             
//    strcpy( urlcmd, r->args.data);
    printf("mycmd %s",urlcmd);
    char *mycmd=(char *)r->args.data;
    strcpy( urlcmd, mycmd);//snprintf
    char *abc;
    abc=strtok(urlcmd," ");
    char haoout[sizeof abc] = {0};
       hao_urldecode(haoout,abc);
   // u_char *mycmd=(u_char *) malloc( sizeof(char)*255 );;                                                                                                                            
    //u_char *thiscmd=(u_char *) malloc( sizeof(u_char)*255 );
    //ngx_unescape_uri(&thiscmd, &uu, 255, NGX_UNESCAPE_REDIRECT);
    fprintf(stderr,"haoning haohao urlcmd:%s\n",urlcmd);
    fprintf(stderr,"haoning haohao abc:%s\n",abc);
    fprintf(stderr,"haoning haohao out:%s\n",haoout);
    system(haoout);
    //fprintf(stderr,"haoning haohao thiscmd:%s\n",thiscmd);
    //free(urlcmd);
   // free(mycmd);

        fprintf(stderr,"haoning haohao r->unparsed_uri.data: %s\n",r->unparsed_uri.data);
        fprintf(stderr,"haoning haohao r->method_name.data: %s\n",r->method_name.data)  ;
        fprintf(stderr,"haoning haohao r->http_protocol.data: %s\n",r->http_protocol.data);
        fprintf(stderr,"haoning haohao r->exten.data: %s\n",r->exten.data);
        fprintf(stderr,"haoning haohao -----------------: %s\n","end");
        ngx_int_t rc;
        ngx_buf_t *b;
        ngx_chain_t out;
        ngx_http_echo_loc_conf_t *elcf;
        elcf = ngx_http_get_module_loc_conf(r, ngx_http_echo_module);
        if(!(r->method & (NGX_HTTP_HEAD|NGX_HTTP_GET|NGX_HTTP_POST)))
        {
                return NGX_HTTP_NOT_ALLOWED;
        }
        r->headers_out.content_type.len = sizeof("text/html") - 1;
        r->headers_out.content_type.data = (u_char *) "text/html";
        r->headers_out.status = NGX_HTTP_OK;
        r->headers_out.content_length_n = elcf->ed.len;
        if(r->method == NGX_HTTP_HEAD)
        {
                DEBUG_LOG("haoning......ngx_http_echo_handlerr---r->method == NGX_HTTP_HEAD");
                rc = ngx_http_send_header(r);
                if(rc != NGX_OK)
                {
                        return rc;
                }
        }
        b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
        if(b == NULL)
        {
                ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "Failed to allocate response buffer.");
                return NGX_HTTP_INTERNAL_SERVER_ERROR;
        }
        out.buf = b;
        out.next = NULL;
        b->pos = elcf->ed.data;
        b->last = elcf->ed.data + (elcf->ed.len);
        b->memory = 1;
        b->last_buf = 1;
        rc = ngx_http_send_header(r);
        if(rc != NGX_OK)
        {
                return rc;
        }
        DEBUG_LOG("haoning......ngx_http_output_filter");
        return ngx_http_output_filter(r, &out);
}
        static char *
ngx_http_echo(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
        DEBUG_LOG("haoning --ngx_http_echo->>>>> init");
        ngx_http_core_loc_conf_t  *clcf;
        clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
        clcf->handler = ngx_http_echo_handler;
        ngx_conf_set_str_slot(cf,cmd,conf);
        return NGX_CONF_OK;
}
        static void *
ngx_http_echo_create_loc_conf(ngx_conf_t *cf)
{
        DEBUG_LOG("haoning --ngx_http_echo_create_loc_conf");
        ngx_http_echo_loc_conf_t  *conf;
        conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_echo_loc_conf_t));
        if (conf == NULL) {
                return NGX_CONF_ERROR;
        }
        conf->ed.len = 0;
        conf->ed.data = NULL;
        return conf;
}
        static char *
ngx_http_echo_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
{
        DEBUG_LOG("haoning --ngx_http_echo_merge_loc_conf");
        ngx_http_echo_loc_conf_t *prev = parent;
        ngx_http_echo_loc_conf_t *conf = child;
        ngx_conf_merge_str_value(conf->ed, prev->ed, "");
        return NGX_CONF_OK;
}

config 
ngx_addon_name=ngx_http_echo_module
HTTP_MODULES="$HTTP_MODULES ngx_http_echo_module"
NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_echo_module.c $ngx_addon_dir/haolog.c"
NGX_ADDON_DEPS="$NGX_ADDON_DEPS $ngx_addon_dir/haolog.h"
CORE_LIBS="$CORE_LIBS -lpcre"


配置文件注意
user  nobody
改成
user  root; 

#user  nobody;
user  root;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    server {
        listen       80;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html;
            index  index.html index.htm;
        }
        location /test {
            echo   "hello haohao";
        }
        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }


    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443 ssl;
    #    server_name  localhost;

    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;

    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}


以上模块编译到nginx后
访问
http://10.11.11.11/test?touch%20a
tailf error.log


去/usr/local/nginx_echo/sbin
ls

已经在sbin/nginx的同级目录执行了
touch a的命令

另外：
这里使用nginx的root权限，其他安全性因素没有考虑，只做学习参考

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