WEBVTT 1 00:00:00.000 --> 00:00:03.319 All right, let's dive into PHP security. Oh yeah, it 2 00:00:03.439 --> 00:00:06.839 might sound kind of dry, okay, but trust me, it's fascinating. 3 00:00:06.919 --> 00:00:09.599 All Right, we're going to be using an excerpt from 4 00:00:09.720 --> 00:00:13.400 pro PHP Security. Okay, it's like having a security expert 5 00:00:13.519 --> 00:00:16.280 right here with us, Yeah, giving us all their secrets. Yeah. 6 00:00:16.280 --> 00:00:16.760 I like it. 7 00:00:17.000 --> 00:00:19.000 And it's really from a developer's perspective. 8 00:00:19.199 --> 00:00:21.000 That's what's so cool about this one is that it 9 00:00:21.079 --> 00:00:24.039 really is a practical developer's perspective. 10 00:00:24.120 --> 00:00:25.519 Yeah, and that's what we want to give you in 11 00:00:25.519 --> 00:00:28.239 this deep dive is to be able to think like 12 00:00:28.320 --> 00:00:33.200 the attackers and anticipate their every move. By the end 13 00:00:33.200 --> 00:00:35.799 of this, I think you're going to be really surprised 14 00:00:35.920 --> 00:00:39.920 by how much you know about PHP security for sure, 15 00:00:40.039 --> 00:00:43.759 and how much more aware you are just the security 16 00:00:43.840 --> 00:00:44.719 landscape in general. 17 00:00:44.799 --> 00:00:47.880 The thing is, security isn't just about writing impenetrable code. 18 00:00:48.479 --> 00:00:53.240 It's about understanding the psychology of the attackers, their motivations, 19 00:00:53.280 --> 00:00:56.640 their tactics, and then using that knowledge to outsmart them. 20 00:00:56.960 --> 00:01:00.280 So this is like a psychological thriller. Yeah, as much 21 00:01:00.320 --> 00:01:01.679 as it is a technical manual. 22 00:01:01.719 --> 00:01:02.799 It makes it way more interesting. 23 00:01:02.840 --> 00:01:06.920 So let's jump right in. This source really emphasizes this 24 00:01:07.000 --> 00:01:10.480 idea of good medicine ship, which is the responsibility we 25 00:01:10.560 --> 00:01:14.319 have as developers to each other and to the Internet 26 00:01:14.400 --> 00:01:14.879 as a whole. 27 00:01:15.000 --> 00:01:19.040 Yeah, in today's hyperconnected world, even a seemingly simple app 28 00:01:19.560 --> 00:01:23.719 can have you know, global consequences if it's compromised. Absolutely 29 00:01:23.799 --> 00:01:29.760 Like imagine a small e commerce site getting hacked. That 30 00:01:29.959 --> 00:01:37.200 breach could expose sensitive customer data, impacting thousands of people worldwide. 31 00:01:37.319 --> 00:01:40.480 So it's not just our little application, it's potentially a 32 00:01:40.560 --> 00:01:43.640 ripple effect that can go out. It's massive across the globe. Absolutely, 33 00:01:43.799 --> 00:01:48.400 So how can we embrace this good nedicineeship and build 34 00:01:48.439 --> 00:01:49.480 secure applications? 35 00:01:49.519 --> 00:01:52.840 Well, the source outlines five key security habits of fives 36 00:01:52.879 --> 00:01:54.319 that are really worth exploring. 37 00:01:54.840 --> 00:01:56.719 One of the most important habits. 38 00:01:57.239 --> 00:02:02.200 Is to approach security with a mindset of defense in depth. 39 00:02:02.359 --> 00:02:04.239 Defense in depth what does that mean. 40 00:02:04.640 --> 00:02:09.080 It means not relying on a single security measure, okay, 41 00:02:09.319 --> 00:02:13.759 but rather implementing multiple layers of protection. So think of 42 00:02:13.759 --> 00:02:17.080 it like protecting a castle. You wouldn't just rely on 43 00:02:17.120 --> 00:02:21.560 a single wall, I guess not. You'd want moats, drawbridges, guards, 44 00:02:21.960 --> 00:02:25.759 the whole nine yards exactly. It's about creating a system 45 00:02:26.000 --> 00:02:30.680 where even if one layer of security fails, there are 46 00:02:30.719 --> 00:02:31.520 others in place. 47 00:02:31.680 --> 00:02:33.680 Oh, so it's okay if one fails, it's. 48 00:02:33.639 --> 00:02:37.120 Not ideal, but we're planning for it to prevent a 49 00:02:37.159 --> 00:02:40.520 full breach. So even if the attackers get past the 50 00:02:40.560 --> 00:02:43.639 first line of defense, they hit another and another and another. 51 00:02:43.719 --> 00:02:46.759 It's a good obstacle course for hackers exactly. 52 00:02:46.879 --> 00:02:49.759 And this is particularly crucial in PHP because there are 53 00:02:49.800 --> 00:02:55.000 so many potential vulnerabilities from user input to server configurations, so. 54 00:02:55.039 --> 00:02:56.360 You gotta be prepared for anything. 55 00:02:56.479 --> 00:02:57.439 You have to be prepared. 56 00:02:57.479 --> 00:02:59.560 So it's about having backup plans. 57 00:02:59.199 --> 00:03:02.639 In place, and a key part of that is remembering 58 00:03:02.680 --> 00:03:06.319 that nothing is one hundred percent secure. It's acknowledging that 59 00:03:06.439 --> 00:03:10.080 inherent vulnerability and planning accordingly. 60 00:03:10.360 --> 00:03:14.080 So it's you accept that they might breach the walls, exactly, 61 00:03:14.080 --> 00:03:16.759 and you better have a plan for the inner keep exactly. 62 00:03:16.960 --> 00:03:21.479 Understanding that there's no such thing as perfect security allows 63 00:03:21.560 --> 00:03:24.919 us to be more strategic, more proactive. 64 00:03:24.280 --> 00:03:24.840 In our approach. 65 00:03:24.919 --> 00:03:27.599 Okay, so it's a more dynamic approach, yes, much more 66 00:03:27.680 --> 00:03:30.719 like a game of chess. You're always trying to anticipate. 67 00:03:30.199 --> 00:03:33.159 The next move precisely, and that brings us to another 68 00:03:33.639 --> 00:03:38.919 crucial aspect highlighted in the source, the human element. 69 00:03:39.039 --> 00:03:42.080 Oh, the human element in security. Okay, so we're moving 70 00:03:42.080 --> 00:03:43.680 beyond just the code now exactly. 71 00:03:43.759 --> 00:03:47.240 Security is just as much about psychology as it is 72 00:03:47.280 --> 00:03:48.840 about technical measures. 73 00:03:48.520 --> 00:03:51.159 Right, So what does that look like in PHP security? 74 00:03:51.560 --> 00:03:56.879 So consider attackers motivated by things like griefing, trolling. The 75 00:03:56.879 --> 00:04:00.800 Source refers to these as human attacks, okay, and understanding 76 00:04:00.800 --> 00:04:02.280 their motivations is crucial. 77 00:04:02.360 --> 00:04:05.800 So it's not always some sophisticated hacker trying to seal data. 78 00:04:06.479 --> 00:04:09.759 It could just be someone who wants to cause maybe disruption. 79 00:04:10.000 --> 00:04:13.879 It's about predicting human behavior, right, and designing systems that 80 00:04:13.919 --> 00:04:16.120 are resilient to these kinds of attacks. 81 00:04:16.160 --> 00:04:18.199 Okay, So how does that differ from something like an 82 00:04:18.240 --> 00:04:19.160 automated attack. 83 00:04:19.319 --> 00:04:21.879 So think of a worm that spreads across the Internet 84 00:04:21.959 --> 00:04:25.040 in minutes, right, or a denial of service attack that 85 00:04:25.079 --> 00:04:29.560 cripples a website. Yeah, these are real events with real consequences, 86 00:04:29.879 --> 00:04:34.600 and they often stem from automated processes, not necessarily human intent. 87 00:04:35.279 --> 00:04:37.839 So with the automated ones, yeah, it's more about the 88 00:04:37.879 --> 00:04:38.759 speed and scale. 89 00:04:38.959 --> 00:04:41.680 The speed and the scale are massive, okay. 90 00:04:41.480 --> 00:04:44.879 So you've got to have totally different defenses in place. 91 00:04:44.959 --> 00:04:45.839 You have to be ready. 92 00:04:45.920 --> 00:04:47.639 Okay, man, let's get our hands dirty a little bit. 93 00:04:47.759 --> 00:04:48.279 Let's do it. 94 00:04:48.360 --> 00:04:51.839 The source spends a lot of time on seql injection, right, 95 00:04:52.079 --> 00:04:55.319 and it's scary how something as simple as user input 96 00:04:56.040 --> 00:04:56.959 can be exploited. 97 00:04:57.199 --> 00:05:01.199 It's a classic attack, right, but still incredibly relevant today. Okay, 98 00:05:02.040 --> 00:05:04.839 So the source has a really vivid example. Imagine someone 99 00:05:04.920 --> 00:05:10.439 typing in what looks like harmless input into a search bar. Okay, 100 00:05:10.680 --> 00:05:15.199 but behind the scenes, yeah, it's actually a carefully crafted command, right, 101 00:05:15.600 --> 00:05:17.480 designed to manipulate your database. 102 00:05:17.519 --> 00:05:20.720 Oh so it's like a wolf in cheap clothing exactly. 103 00:05:20.800 --> 00:05:24.120 It looks innocent, it looks totally normal, but it's not. Yeah, 104 00:05:24.160 --> 00:05:26.000 and this is known as sequel injection. 105 00:05:26.279 --> 00:05:26.759 Okay. 106 00:05:26.800 --> 00:05:30.680 This highlights how something as basic as user input can 107 00:05:30.720 --> 00:05:31.600 become a weapon. 108 00:05:31.839 --> 00:05:33.959 So how do we defend against that? Well, do we 109 00:05:34.040 --> 00:05:36.160 have to become code whisperers. 110 00:05:36.199 --> 00:05:37.160 Well, you don't have to. 111 00:05:37.319 --> 00:05:39.439 To understand these malicious commands. 112 00:05:39.720 --> 00:05:44.279 The source outlines a multi layered approach to preventing seql injection. Okay, 113 00:05:44.319 --> 00:05:47.560 so first we need to escape special characters like quotation 114 00:05:47.720 --> 00:05:51.600 marks that can be used to manipulate those database queries. 115 00:05:51.680 --> 00:05:54.319 So you're disarming the dangerous characters exactly. 116 00:05:54.399 --> 00:05:57.279 You're taking away the tool right that the attackers could use. 117 00:05:57.360 --> 00:06:00.920 Okay, So it's not about recognizing every single, single one 118 00:06:00.959 --> 00:06:04.439 malicious command. It's about preventing those commands from ever happening. 119 00:06:04.839 --> 00:06:05.439 Exactly. 120 00:06:05.600 --> 00:06:09.959 Another critical step is validating data types, Okay, making sure 121 00:06:10.000 --> 00:06:13.600 you're receiving numbers where you expect numbers, text where you 122 00:06:13.680 --> 00:06:15.639 expect text, and so on. 123 00:06:15.720 --> 00:06:18.040 So it's like double checking the ingredients before you bake 124 00:06:18.079 --> 00:06:18.399 a cake. 125 00:06:18.680 --> 00:06:19.319 I like that. 126 00:06:19.839 --> 00:06:22.600 You know you don't want to accidentally add salt. No, 127 00:06:22.720 --> 00:06:24.319 you're supposed to be adding sugar. 128 00:06:24.279 --> 00:06:25.560 Right, you don't want a disaster. 129 00:06:25.800 --> 00:06:29.519 Yeah, exactly, it's about making sure the data you're receiving 130 00:06:30.079 --> 00:06:30.920 is what you expect. 131 00:06:31.040 --> 00:06:34.560 Okay. And then you mentioned something about abstracting validation routines. 132 00:06:34.720 --> 00:06:37.879 Yeah that sounds it is a bit more technical, okay, 133 00:06:38.199 --> 00:06:42.560 but it's really crucial for both security and maintainability. 134 00:06:43.360 --> 00:06:43.720 Okay. 135 00:06:44.079 --> 00:06:48.040 Essentially, you're creating reusable code blocks that you can apply 136 00:06:48.120 --> 00:06:49.120 across your application. 137 00:06:49.319 --> 00:06:52.319 Oh so you're not just fixing this one vulnerability, you're 138 00:06:52.360 --> 00:06:56.160 creating like a system exact to help prevent similar issues 139 00:06:56.199 --> 00:06:56.720 in the future. 140 00:06:56.879 --> 00:06:57.399 Exactly. 141 00:06:57.439 --> 00:07:03.000 That's key in secure coding, beyond individual vulnerabilities and creating 142 00:07:03.040 --> 00:07:04.879 systems that are inherently more resilient. 143 00:07:05.000 --> 00:07:09.800 Got it. Okay, Now, another vulnerability the Source highlights is 144 00:07:09.879 --> 00:07:13.759 cross site scripting or XSS. What's that all about. 145 00:07:13.920 --> 00:07:17.879 It's like turning your website into a trap for unsuspecting users, 146 00:07:18.279 --> 00:07:20.639 exploiting their trust in your application. 147 00:07:20.879 --> 00:07:22.279 So give me a real world example. 148 00:07:22.399 --> 00:07:27.800 Okay, imagine a seemingly harmless comment section on your website. Now, 149 00:07:27.879 --> 00:07:30.680 picture a malicious link hidden within those comments. 150 00:07:30.839 --> 00:07:31.000 Uh. 151 00:07:31.040 --> 00:07:34.879 Oh, When a user clicks that link, a malicious script 152 00:07:34.959 --> 00:07:35.560 is triggered. 153 00:07:35.959 --> 00:07:39.680 Oh so something that looks innocent, completely innocent, can actually 154 00:07:39.759 --> 00:07:42.480 be dangerous. Yes, okay, that's unsubject. 155 00:07:42.560 --> 00:07:45.639 Yeah. And what's worse is that the script can steal 156 00:07:45.720 --> 00:07:49.720 their session cookies, redirect them to malicious websites, or even 157 00:07:49.800 --> 00:07:52.839 modify the content of the page wow to trick them 158 00:07:52.879 --> 00:07:54.040 into revealing information. 159 00:07:54.279 --> 00:07:56.040 So this isn't just vandalism or disruption. 160 00:07:56.199 --> 00:08:00.240 This is like serious, It can have real consequence. What 161 00:08:00.319 --> 00:08:05.519 makes EXSS particularly dangerous is that seemingly innocuous elements like 162 00:08:05.720 --> 00:08:10.360 image tags, form submissions, even those comments can be weaponized. 163 00:08:10.560 --> 00:08:12.279 So you really got to think like an attacker. 164 00:08:12.480 --> 00:08:13.000 You have to. 165 00:08:13.199 --> 00:08:14.480 You don't know where it's coming from. 166 00:08:14.600 --> 00:08:15.079 It's tough. 167 00:08:15.160 --> 00:08:16.680 You can't build the defenses now. 168 00:08:17.040 --> 00:08:20.800 And moving beyond preventing intrusions, okay, we also need to 169 00:08:20.839 --> 00:08:23.680 think about protecting data once it's within our application. 170 00:08:24.120 --> 00:08:27.519 Yeah, okay, So the source mentions temporary files, yeah, and 171 00:08:27.560 --> 00:08:28.480 the risk they pose. 172 00:08:28.959 --> 00:08:29.160 Right. 173 00:08:29.360 --> 00:08:34.159 They're essential for many web applications. They store data temporarily 174 00:08:34.240 --> 00:08:38.440 during processing, but if they're not properly secured, they can 175 00:08:38.440 --> 00:08:39.080 be hijacked. 176 00:08:39.159 --> 00:08:41.200 Right, So it's like you're leaving sensitive information. 177 00:08:41.360 --> 00:08:42.840 It's like it's out in the open, just not in 178 00:08:42.879 --> 00:08:46.080 the open. So the source offers a solution, okay for 179 00:08:46.240 --> 00:08:50.960 securing temporary files. Okay, independent checksums checksums. 180 00:08:51.480 --> 00:08:53.480 That sounds like something from a spy movie. 181 00:08:53.519 --> 00:08:56.519 It does, okay, but it's pretty simple. It's like creating 182 00:08:56.559 --> 00:09:00.279 a unique fingerprint for each file. By comparing the check 183 00:09:00.279 --> 00:09:03.159 some of a file before and after it's used, you 184 00:09:03.200 --> 00:09:07.600 can verify its integrity. If the checksums don't match, you 185 00:09:07.679 --> 00:09:08.720 know something's fishy. 186 00:09:09.080 --> 00:09:10.240 So it's like an alarm system. 187 00:09:10.320 --> 00:09:13.639 It's like an alarm going off exactly, a simple but 188 00:09:13.759 --> 00:09:17.320 powerful way to make sure those files haven't been compromised. 189 00:09:17.440 --> 00:09:21.159 Right, And speaking of things that can be hijacked. Oh yeah, session. 190 00:09:20.879 --> 00:09:22.480 Hijacking, session hijacked. 191 00:09:22.480 --> 00:09:24.200 It sounds like straight out of a spy thriller. 192 00:09:24.440 --> 00:09:25.120 Yeah. 193 00:09:25.159 --> 00:09:27.759 How can something it's scary that's supposed to be helpful 194 00:09:27.799 --> 00:09:29.000 be a security risk? 195 00:09:29.159 --> 00:09:29.399 Yeah? 196 00:09:29.440 --> 00:09:33.720 So sessions rely on unique identifiers, right, often stored in 197 00:09:33.799 --> 00:09:37.720 cookies to track a user's activity on a website. 198 00:09:37.840 --> 00:09:40.320 That's how they remember who you are exactly and what 199 00:09:40.360 --> 00:09:40.799 you've done. 200 00:09:40.960 --> 00:09:43.879 If an attacker gets a hold of that identifier, oh, 201 00:09:44.200 --> 00:09:48.360 they can effectively impersonate the user oh wow, and gain 202 00:09:48.440 --> 00:09:49.519 access to their account. 203 00:09:49.600 --> 00:09:51.759 So it's like stealing a key card it is to 204 00:09:51.799 --> 00:09:53.720 get into a restricted area exactly. 205 00:09:53.960 --> 00:09:58.360 Okay, the source gives a chilling example. Imagine clicking on 206 00:09:58.440 --> 00:10:01.480 what you think is a legitimate Amazon link, but it's 207 00:10:01.519 --> 00:10:07.919 actually a cleverly disguised trap designed to steal your session cookie. 208 00:10:08.039 --> 00:10:09.080 So how do we stop that? 209 00:10:09.519 --> 00:10:13.279 Well, you can't stop using sessions, right, They're essential. Okay, 210 00:10:13.360 --> 00:10:15.759 So we have to take a multi layered approach to 211 00:10:15.840 --> 00:10:16.600 secure them. 212 00:10:17.279 --> 00:10:18.120 Layers, So the. 213 00:10:18.039 --> 00:10:21.080 First layer implement SSL encryption. 214 00:10:21.519 --> 00:10:21.960 Okay. 215 00:10:22.200 --> 00:10:26.080 This protects the session identifiers in transit, making it much 216 00:10:26.120 --> 00:10:28.240 harder for attackers to intercept them. 217 00:10:28.360 --> 00:10:31.159 So it's encrypting the communication channel exactly, so they can't 218 00:10:31.200 --> 00:10:31.840 understand it. 219 00:10:31.919 --> 00:10:32.080 Right. 220 00:10:32.919 --> 00:10:37.080 Next comes here for cookie management, setting appropriate expiration times 221 00:10:37.720 --> 00:10:41.679 security flags to make them less vulnerable to theft. 222 00:10:41.519 --> 00:10:43.279 So making them less appealing targets. 223 00:10:43.360 --> 00:10:44.240 Yes, exactly. 224 00:10:44.799 --> 00:10:47.879 Another clever technique is checking the refer header. 225 00:10:48.000 --> 00:10:49.480 Oh yeah, the refer header. 226 00:10:49.559 --> 00:10:53.559 Yeah, this tells us the website from which the request originated. 227 00:10:53.759 --> 00:10:56.279 So if the refer header doesn't match up, it could 228 00:10:56.279 --> 00:10:59.279 be a red flag that's suspicious. Yeah. Okay, So it's 229 00:10:59.320 --> 00:11:03.799 like checking one's ID before you grant them access exactly. Okay, 230 00:11:03.840 --> 00:11:06.519 So there's so many different techniques. There are so many 231 00:11:06.559 --> 00:11:09.720 for securing your applications. Yeah, it's like a puzzle, it is. 232 00:11:09.759 --> 00:11:12.000 But all these pieces have to fit together. 233 00:11:11.840 --> 00:11:14.559 And a key part of solving that puzzle is understanding 234 00:11:14.600 --> 00:11:16.480 the mindset of the attacker. 235 00:11:17.159 --> 00:11:17.480 Right. 236 00:11:17.600 --> 00:11:22.000 We need to think like them, anticipate their moves, build 237 00:11:22.039 --> 00:11:25.080 defenses that account for their cunning tactics. 238 00:11:25.360 --> 00:11:27.320 So we've covered a lot of ground here. We have 239 00:11:27.679 --> 00:11:31.679 from good netizenship to the psychology of attackers, and then 240 00:11:31.720 --> 00:11:34.440 we got down and dirty in the code we did. 241 00:11:34.960 --> 00:11:37.120 But before we go too much further, let's pause here 242 00:11:37.159 --> 00:11:37.440 for a. 243 00:11:37.360 --> 00:11:40.799 Moment, Okay, and take a moment to think about what 244 00:11:40.799 --> 00:11:41.559 we've discussed. 245 00:11:41.639 --> 00:11:43.240 Yeah, what has resonated with you? 246 00:11:43.320 --> 00:11:44.120 What stood out to you? 247 00:11:44.600 --> 00:11:47.120 Well, I got to say, yeah, the thing about the 248 00:11:47.200 --> 00:11:50.600 human element of security that was a real eye opener 249 00:11:50.639 --> 00:11:50.879 for me. 250 00:11:51.080 --> 00:11:54.000 It's often overlooked, but it's so important. 251 00:11:54.120 --> 00:11:56.840 I've always thought of it as a technical challenge, but 252 00:11:57.240 --> 00:12:01.440 realizing how much psychology is involved is really something. 253 00:12:01.559 --> 00:12:03.799 We can have all the technical defenses in the world, 254 00:12:03.960 --> 00:12:06.960 but if we don't understand the motives and the tactics 255 00:12:07.000 --> 00:12:09.879 of the attackers, we're always going to be behind the 256 00:12:09.919 --> 00:12:10.320 eight ball. 257 00:12:10.720 --> 00:12:13.039 And the thing that really stood out to me is 258 00:12:13.159 --> 00:12:17.919 just how resourceful. Yes, some of these attackers are. Absolutely 259 00:12:18.120 --> 00:12:20.200 It's like they're always finding a new way they are 260 00:12:20.440 --> 00:12:21.720 to exploit our systems. 261 00:12:21.759 --> 00:12:24.960 It's a constant arms race for sure. Right, that's why 262 00:12:24.960 --> 00:12:27.039 it's so important to stay up to date on the 263 00:12:27.120 --> 00:12:29.840 latest threats and vulnerabilities. 264 00:12:30.159 --> 00:12:35.320 The source mentions some dangerous operations. Oh yeah, that happen 265 00:12:35.360 --> 00:12:38.159 at the server level. Okay, like running commands is root? 266 00:12:38.360 --> 00:12:42.120 Right? Those get me nervous. Yeah, those are really powerful. 267 00:12:42.200 --> 00:12:44.840 Yeah. If an attacker gains access through root. 268 00:12:44.879 --> 00:12:47.039 Oh, they have control over everything. 269 00:12:47.120 --> 00:12:48.840 Yeah, they can do anything your whole server. 270 00:12:49.039 --> 00:12:50.200 Imagine the chaos. 271 00:12:50.279 --> 00:12:51.080 It would be bad. 272 00:12:51.600 --> 00:12:52.639 So how do we prevent that? 273 00:12:53.080 --> 00:12:53.480 Okay? 274 00:12:53.559 --> 00:12:56.879 Do we lock everything down and make those commands inaccessible? 275 00:12:57.799 --> 00:13:01.360 Well that's tempting, but it's not always right. 276 00:13:01.240 --> 00:13:02.840 Because legitimate users might need to. 277 00:13:02.879 --> 00:13:04.720 Run those exactly. We've got to find the right balance. 278 00:13:04.799 --> 00:13:06.600 Okay, So how do we walk that tyrote? 279 00:13:06.799 --> 00:13:09.360 So the source suggests creating a queuing system. 280 00:13:09.600 --> 00:13:10.000 Okay. 281 00:13:10.559 --> 00:13:15.399 This allows unprivileged scripts to hand off those risky operations 282 00:13:15.440 --> 00:13:17.000 to a more privileged user. 283 00:13:17.200 --> 00:13:19.720 So it's like a security checkpoint before they can actually run. 284 00:13:19.919 --> 00:13:20.320 Exactly. 285 00:13:20.320 --> 00:13:24.519 A way to introduce oversight okay, and control without completely 286 00:13:24.519 --> 00:13:25.559 shutting everything down. 287 00:13:25.720 --> 00:13:29.440 Okay, makes sense. Now. The source also talks about resource 288 00:13:29.480 --> 00:13:34.639 intensive operations like video encoding or large file uploads. Those 289 00:13:34.639 --> 00:13:39.039 aren't as dangerous as root level commands, but they can 290 00:13:39.080 --> 00:13:39.799 cause problems. 291 00:13:39.799 --> 00:13:44.080 They can bog down a server or impact performance, create 292 00:13:44.159 --> 00:13:45.559 openings for attackers. 293 00:13:46.000 --> 00:13:48.039 So how do we tackle those? Would you just throw 294 00:13:48.080 --> 00:13:49.200 more server power at it? 295 00:13:49.320 --> 00:13:50.799 Well, that can help, okay. 296 00:13:50.840 --> 00:13:54.080 The source recommends looking at techniques like batch processing. 297 00:13:54.559 --> 00:13:54.919 Okay. 298 00:13:55.120 --> 00:13:58.240 This allows you to schedule those resource heavy. 299 00:13:57.960 --> 00:14:01.720 Tasks to run during off peak hours. 300 00:14:02.200 --> 00:14:02.399 Right. 301 00:14:02.519 --> 00:14:05.000 So it's not going to impact the user experience exactly. 302 00:14:05.039 --> 00:14:09.200 It's about being smart with resource allocation minimizing impact on 303 00:14:09.240 --> 00:14:10.080 system performance. 304 00:14:10.679 --> 00:14:16.000 Makes sense, And I mentioned something about using PHPs built 305 00:14:16.039 --> 00:14:21.600 in process management functions to control parallelization. That sounds a 306 00:14:21.639 --> 00:14:22.600 little complicated. 307 00:14:22.720 --> 00:14:25.519 It might sound complex, but the idea is pretty simple. 308 00:14:25.639 --> 00:14:25.879 Okay. 309 00:14:26.159 --> 00:14:30.840 Parallelization essentially means running multiple processes at the same time. 310 00:14:31.720 --> 00:14:35.799 So imagine a team working on a project, each handling 311 00:14:35.879 --> 00:14:39.399 a specific task. Okay, that's parallelization, I get it. So 312 00:14:39.440 --> 00:14:43.039 it's like spreading out the workload exactly. You don't overload 313 00:14:43.039 --> 00:14:47.519 the system. It's about orchestrating those processes efficiently and ensuring 314 00:14:47.600 --> 00:14:48.440 smooth workflow. 315 00:14:49.000 --> 00:14:51.759 So we're building like a multifaceted approach here. 316 00:14:52.000 --> 00:14:53.799 We are to server security. 317 00:14:54.080 --> 00:14:57.480 Yeah, not only are we dealing with malicious attacks, but 318 00:14:57.559 --> 00:15:01.320 we're also dealing with these resource and intensive things that could. 319 00:15:01.200 --> 00:15:02.679 Accidentally Yeah, open the door. 320 00:15:02.799 --> 00:15:07.480 Yeah, it's all about finding that balance between functionality and security. 321 00:15:08.080 --> 00:15:11.440 We can't lock down our servers so tightly that they 322 00:15:11.440 --> 00:15:14.600 become unusable, but we can't leave them wide open to 323 00:15:14.679 --> 00:15:15.879 attack either, right. 324 00:15:15.919 --> 00:15:20.200 Okay, Now, the source also delves into session management and 325 00:15:20.600 --> 00:15:22.000 security implications. 326 00:15:22.080 --> 00:15:25.720 A crucial area in PHP. So the source starts by 327 00:15:25.759 --> 00:15:29.679 explaining how persistent sessions work, you know, those that allow 328 00:15:29.759 --> 00:15:32.919 websites to remember who you are, keep you logged. 329 00:15:32.639 --> 00:15:34.399 In super convenient. 330 00:15:33.960 --> 00:15:35.240 Even after you close your browser. 331 00:15:35.399 --> 00:15:36.919 Yeah, but what's the security risk? 332 00:15:37.080 --> 00:15:42.480 So while they enhance user experience, they rely on unique identifiers, 333 00:15:42.519 --> 00:15:46.200 often stored in cookies, to track your activity, and if 334 00:15:46.200 --> 00:15:49.039 an attacker gets a hold of that, they can hijack 335 00:15:49.039 --> 00:15:49.519 your session. 336 00:15:49.679 --> 00:15:51.720 Yeah, it's like stealing a key card, it is to 337 00:15:51.799 --> 00:15:53.200 get into a restricted area. 338 00:15:53.360 --> 00:15:56.480 So what else do we do to mitigate this? The 339 00:15:56.519 --> 00:16:01.000 source really emphasizes the importance of SSL encryption, protecting those 340 00:16:01.039 --> 00:16:06.600 identifiers during transmission, okay, also careful cookie management, setting those 341 00:16:06.679 --> 00:16:11.159 expiration time security flags to make them less vulnerable. 342 00:16:11.320 --> 00:16:14.279 Okay, so making it harder to steal, yeah, exactly. And 343 00:16:14.320 --> 00:16:18.080 then the refer header, Oh yeah, that can help here too, absolutely, 344 00:16:18.200 --> 00:16:21.759 to verify that the requests are coming from the right place, 345 00:16:21.840 --> 00:16:25.360 from the right place. So all these security measures, yeah, 346 00:16:25.440 --> 00:16:27.399 kind of overlap and reinforce each other. 347 00:16:27.519 --> 00:16:27.840 They do. 348 00:16:27.919 --> 00:16:32.000 It's not about memorizing a list of fixes, right, It's 349 00:16:32.000 --> 00:16:35.559 about understanding those security principles and applying. 350 00:16:35.120 --> 00:16:36.600 Them in different situations. 351 00:16:36.639 --> 00:16:38.679 It's like learning the fundamentals of martial arts. 352 00:16:38.759 --> 00:16:39.080 Yeah. 353 00:16:39.240 --> 00:16:41.879 Once you master the basic moves, you can adapt. 354 00:16:42.120 --> 00:16:44.679 Okay. Now let's shift gears a bit. Okay and talk 355 00:16:44.679 --> 00:16:46.120 about RESTful services. 356 00:16:46.320 --> 00:16:47.879 RESTful services. 357 00:16:48.120 --> 00:16:51.039 Yeah, I've heard that term, yeah, but I don't really 358 00:16:51.120 --> 00:16:51.720 know what it means. 359 00:16:52.000 --> 00:16:56.639 Basically, rest is an architectural style for building web services. Okay, 360 00:16:56.759 --> 00:16:59.639 So think of them as APIs that allow different applications 361 00:16:59.639 --> 00:17:00.000 to commit. 362 00:17:00.399 --> 00:17:03.639 Oh so they're like messengers. Yes, it's in different applications 363 00:17:03.679 --> 00:17:04.880 right to talk to each other. 364 00:17:05.000 --> 00:17:05.319 Yeah. 365 00:17:05.359 --> 00:17:07.839 So what makes RESTful services so special? 366 00:17:08.000 --> 00:17:13.880 So rest emphasizes simplicity okay, and scalability. It uses standard 367 00:17:14.079 --> 00:17:17.559 HTTP methods like get a T and post yeah to 368 00:17:17.640 --> 00:17:20.759 interact with resources. It's very flexible and efficient. 369 00:17:21.000 --> 00:17:24.000 Right. So if it's all about communication, how do we 370 00:17:24.119 --> 00:17:28.319 secure it? Oh? Yeah, what stops someone from eavesdropping or tampering? 371 00:17:28.640 --> 00:17:31.000 That's a great question. Yeah, and that's where things get 372 00:17:31.039 --> 00:17:31.759 really interesting. 373 00:17:31.960 --> 00:17:32.319 Okay. 374 00:17:32.400 --> 00:17:35.759 So the source outlines several strategies okay. One of them 375 00:17:35.839 --> 00:17:41.000 is restricting access to specific resources okay, and then using 376 00:17:41.039 --> 00:17:42.759 API keys for authentication. 377 00:17:43.079 --> 00:17:44.960 API keys those are like passwords. 378 00:17:45.079 --> 00:17:46.640 Yeah, it's like a password. 379 00:17:46.200 --> 00:17:49.880 For applications to prove they're allowed to use the services. 380 00:17:50.039 --> 00:17:53.480 Yes, a way to control which applications are authorized. Got 381 00:17:53.519 --> 00:17:55.559 it to access those valuable resources. 382 00:17:55.599 --> 00:17:58.240 Okay, makes sense, And it mentions HMIC hashing. 383 00:17:58.519 --> 00:18:03.279 Yeah, so it's a form of cryptography, essentially using codes 384 00:18:03.319 --> 00:18:08.480 to secure information. HMAC hashing is a way to cryptographically 385 00:18:08.640 --> 00:18:12.160 sign a message, ensuring that it hasn't been tampered with 386 00:18:12.319 --> 00:18:13.079 during transit. 387 00:18:13.200 --> 00:18:15.319 Oh so it's like a tamper proof seal. It is 388 00:18:15.359 --> 00:18:18.279 on those API keys exact, so you know they're authentic. 389 00:18:18.599 --> 00:18:19.440 It's a great way. 390 00:18:19.279 --> 00:18:19.839 To think about it. 391 00:18:19.880 --> 00:18:22.599 And this is just one example of how cryptography is 392 00:18:22.640 --> 00:18:24.480 so important in modern security. 393 00:18:24.759 --> 00:18:27.559 It seems like cryptography is everywhere now. It is from 394 00:18:27.640 --> 00:18:31.720 protecting passwords to online transactions. 395 00:18:32.119 --> 00:18:35.160 It really is like the invisible guardian of the digital world. 396 00:18:35.359 --> 00:18:36.880 The sign the protector exactly. 397 00:18:36.920 --> 00:18:41.319 The source dedicates a whole chapter to encryption and hashing, 398 00:18:41.920 --> 00:18:44.200 exploring all the different algorithms. 399 00:18:43.839 --> 00:18:45.640 We have to get that technical, you don't have to 400 00:18:45.680 --> 00:18:46.599 go that deepka. 401 00:18:46.759 --> 00:18:50.640